xref: /frameworks/base/core/java/android/view/ViewRootImpl.java

/*
 * Copyright (C) 2006 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package android.view;

import android.Manifest;
import android.animation.LayoutTransition;
import android.animation.ValueAnimator;
import android.app.ActivityManagerNative;
import android.content.ClipDescription;
import android.content.ComponentCallbacks;
import android.content.ComponentCallbacks2;
import android.content.Context;
import android.content.pm.ApplicationInfo;
import android.content.pm.PackageManager;
import android.content.res.CompatibilityInfo;
import android.content.res.Configuration;
import android.content.res.Resources;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.PixelFormat;
import android.graphics.Point;
import android.graphics.PointF;
import android.graphics.PorterDuff;
import android.graphics.Rect;
import android.graphics.Region;
import android.graphics.drawable.Drawable;
import android.media.AudioManager;
import android.os.Binder;
import android.os.Bundle;
import android.os.Debug;
import android.os.Handler;
import android.os.LatencyTimer;
import android.os.Looper;
import android.os.Message;
import android.os.ParcelFileDescriptor;
import android.os.PowerManager;
import android.os.Process;
import android.os.RemoteException;
import android.os.SystemClock;
import android.os.SystemProperties;
import android.os.Trace;
import android.util.AndroidRuntimeException;
import android.util.DisplayMetrics;
import android.util.Log;
import android.util.Slog;
import android.util.TypedValue;
import android.view.View.AttachInfo;
import android.view.View.MeasureSpec;
import android.view.accessibility.AccessibilityEvent;
import android.view.accessibility.AccessibilityManager;
import android.view.accessibility.AccessibilityManager.AccessibilityStateChangeListener;
import android.view.accessibility.AccessibilityNodeInfo;
import android.view.accessibility.AccessibilityNodeProvider;
import android.view.accessibility.IAccessibilityInteractionConnection;
import android.view.accessibility.IAccessibilityInteractionConnectionCallback;
import android.view.animation.AccelerateDecelerateInterpolator;
import android.view.animation.Interpolator;
import android.view.inputmethod.InputConnection;
import android.view.inputmethod.InputMethodManager;
import android.widget.Scroller;

import com.android.internal.R;
import com.android.internal.policy.PolicyManager;
import com.android.internal.view.BaseSurfaceHolder;
import com.android.internal.view.IInputMethodCallback;
import com.android.internal.view.IInputMethodSession;
import com.android.internal.view.RootViewSurfaceTaker;

import java.io.IOException;
import java.io.OutputStream;
import java.lang.ref.WeakReference;
import java.util.ArrayList;
import java.util.HashSet;

/**
 * The top of a view hierarchy, implementing the needed protocol between View
 * and the WindowManager.  This is for the most part an internal implementation
 * detail of {@link WindowManagerImpl}.
 *
 * {@hide}
 */
@SuppressWarnings({"EmptyCatchBlock", "PointlessBooleanExpression"})
public final class ViewRootImpl implements ViewParent,
        View.AttachInfo.Callbacks, HardwareRenderer.HardwareDrawCallbacks {
    private static final String TAG = "ViewRootImpl";
    private static final boolean DBG = false;
    private static final boolean LOCAL_LOGV = false;
    /** @noinspection PointlessBooleanExpression*/
    private static final boolean DEBUG_DRAW = false || LOCAL_LOGV;
    private static final boolean DEBUG_LAYOUT = false || LOCAL_LOGV;
    private static final boolean DEBUG_DIALOG = false || LOCAL_LOGV;
    private static final boolean DEBUG_INPUT_RESIZE = false || LOCAL_LOGV;
    private static final boolean DEBUG_ORIENTATION = false || LOCAL_LOGV;
    private static final boolean DEBUG_TRACKBALL = false || LOCAL_LOGV;
    private static final boolean DEBUG_IMF = false || LOCAL_LOGV;
    private static final boolean DEBUG_CONFIGURATION = false || LOCAL_LOGV;
    private static final boolean DEBUG_FPS = false;

    private static final boolean USE_RENDER_THREAD = false;

    /**
     * Set this system property to true to force the view hierarchy to render
     * at 60 Hz. This can be used to measure the potential framerate.
     */
    private static final String PROPERTY_PROFILE_RENDERING = "viewancestor.profile_rendering";

    private static final boolean MEASURE_LATENCY = false;
    private static LatencyTimer lt;

    /**
     * Maximum time we allow the user to roll the trackball enough to generate
     * a key event, before resetting the counters.
     */
    static final int MAX_TRACKBALL_DELAY = 250;

    static IWindowSession sWindowSession;

    static final Object mStaticInit = new Object();
    static boolean mInitialized = false;

    static final ThreadLocal<RunQueue> sRunQueues = new ThreadLocal<RunQueue>();

    static final ArrayList<Runnable> sFirstDrawHandlers = new ArrayList<Runnable>();
    static boolean sFirstDrawComplete = false;

    static final ArrayList<ComponentCallbacks> sConfigCallbacks
            = new ArrayList<ComponentCallbacks>();

    private static boolean sUseRenderThread = false;
    private static boolean sRenderThreadQueried = false;
    private static final Object[] sRenderThreadQueryLock = new Object[0];

    long mLastTrackballTime = 0;
    final TrackballAxis mTrackballAxisX = new TrackballAxis();
    final TrackballAxis mTrackballAxisY = new TrackballAxis();

    int mLastJoystickXDirection;
    int mLastJoystickYDirection;
    int mLastJoystickXKeyCode;
    int mLastJoystickYKeyCode;

    final int[] mTmpLocation = new int[2];

    final TypedValue mTmpValue = new TypedValue();

    final InputMethodCallback mInputMethodCallback;
    final Thread mThread;

    final WindowLeaked mLocation;

    final WindowManager.LayoutParams mWindowAttributes = new WindowManager.LayoutParams();

    final W mWindow;

    final int mTargetSdkVersion;

    int mSeq;

    View mView;
    View mFocusedView;
    View mRealFocusedView;  // this is not set to null in touch mode
    View mOldFocusedView;

    View mAccessibilityFocusedHost;
    AccessibilityNodeInfo mAccessibilityFocusedVirtualView;

    int mViewVisibility;
    boolean mAppVisible = true;
    int mOrigWindowType = -1;

    // Set to true if the owner of this window is in the stopped state,
    // so the window should no longer be active.
    boolean mStopped = false;

    boolean mLastInCompatMode = false;

    SurfaceHolder.Callback2 mSurfaceHolderCallback;
    BaseSurfaceHolder mSurfaceHolder;
    boolean mIsCreating;
    boolean mDrawingAllowed;

    final Region mTransparentRegion;
    final Region mPreviousTransparentRegion;

    int mWidth;
    int mHeight;
    Rect mDirty;
    final Rect mCurrentDirty = new Rect();
    final Rect mPreviousDirty = new Rect();
    boolean mIsAnimating;

    CompatibilityInfo.Translator mTranslator;

    final View.AttachInfo mAttachInfo;
    InputChannel mInputChannel;
    InputQueue.Callback mInputQueueCallback;
    InputQueue mInputQueue;
    FallbackEventHandler mFallbackEventHandler;
    Choreographer mChoreographer;

    final Rect mTempRect; // used in the transaction to not thrash the heap.
    final Rect mVisRect; // used to retrieve visible rect of focused view.

    boolean mTraversalScheduled;
    int mTraversalBarrier;
    boolean mWillDrawSoon;
    boolean mFitSystemWindowsRequested;
    boolean mLayoutRequested;
    boolean mFirst;
    boolean mReportNextDraw;
    boolean mFullRedrawNeeded;
    boolean mNewSurfaceNeeded;
    boolean mHasHadWindowFocus;
    boolean mLastWasImTarget;
    boolean mWindowsAnimating;
    boolean mIsDrawing;
    int mLastSystemUiVisibility;
    int mClientWindowLayoutFlags;

    // Pool of queued input events.
    private static final int MAX_QUEUED_INPUT_EVENT_POOL_SIZE = 10;
    private QueuedInputEvent mQueuedInputEventPool;
    private int mQueuedInputEventPoolSize;

    // Input event queue.
    QueuedInputEvent mFirstPendingInputEvent;
    QueuedInputEvent mCurrentInputEvent;
    boolean mProcessInputEventsScheduled;

    boolean mWindowAttributesChanged = false;
    int mWindowAttributesChangesFlag = 0;

    // These can be accessed by any thread, must be protected with a lock.
    // Surface can never be reassigned or cleared (use Surface.clear()).
    private final Surface mSurface = new Surface();

    boolean mAdded;
    boolean mAddedTouchMode;

    CompatibilityInfoHolder mCompatibilityInfo;

    /*package*/ int mAddNesting;

    // These are accessed by multiple threads.
    final Rect mWinFrame; // frame given by window manager.

    final Rect mPendingVisibleInsets = new Rect();
    final Rect mPendingContentInsets = new Rect();
    final ViewTreeObserver.InternalInsetsInfo mLastGivenInsets
            = new ViewTreeObserver.InternalInsetsInfo();

    final Rect mFitSystemWindowsInsets = new Rect();

    final Configuration mLastConfiguration = new Configuration();
    final Configuration mPendingConfiguration = new Configuration();

    class ResizedInfo {
        Rect contentInsets;
        Rect visibleInsets;
        Configuration newConfig;
    }

    boolean mScrollMayChange;
    int mSoftInputMode;
    View mLastScrolledFocus;
    int mScrollY;
    int mCurScrollY;
    Scroller mScroller;
    HardwareLayer mResizeBuffer;
    long mResizeBufferStartTime;
    int mResizeBufferDuration;
    static final Interpolator mResizeInterpolator = new AccelerateDecelerateInterpolator();
    private ArrayList<LayoutTransition> mPendingTransitions;

    final ViewConfiguration mViewConfiguration;

    /* Drag/drop */
    ClipDescription mDragDescription;
    View mCurrentDragView;
    volatile Object mLocalDragState;
    final PointF mDragPoint = new PointF();
    final PointF mLastTouchPoint = new PointF();

    private boolean mProfileRendering;
    private Thread mRenderProfiler;
    private volatile boolean mRenderProfilingEnabled;

    // Variables to track frames per second, enabled via DEBUG_FPS flag
    private long mFpsStartTime = -1;
    private long mFpsPrevTime = -1;
    private int mFpsNumFrames;

    private final ArrayList<DisplayList> mDisplayLists = new ArrayList<DisplayList>(24);

    /**
     * see {@link #playSoundEffect(int)}
     */
    AudioManager mAudioManager;

    final AccessibilityManager mAccessibilityManager;

    AccessibilityInteractionController mAccessibilityInteractionController;

    AccessibilityInteractionConnectionManager mAccessibilityInteractionConnectionManager;

    SendWindowContentChangedAccessibilityEvent mSendWindowContentChangedAccessibilityEvent;

    HashSet<View> mTempHashSet;

    private final int mDensity;

    /**
     * Consistency verifier for debugging purposes.
     */
    protected final InputEventConsistencyVerifier mInputEventConsistencyVerifier =
            InputEventConsistencyVerifier.isInstrumentationEnabled() ?
                    new InputEventConsistencyVerifier(this, 0) : null;

    public static IWindowSession getWindowSession(Looper mainLooper) {
        synchronized (mStaticInit) {
            if (!mInitialized) {
                try {
                    InputMethodManager imm = InputMethodManager.getInstance(mainLooper);
                    IWindowManager windowManager = Display.getWindowManager();
                    sWindowSession = windowManager.openSession(
                            imm.getClient(), imm.getInputContext());
                    float animatorScale = windowManager.getAnimationScale(2);
                    ValueAnimator.setDurationScale(animatorScale);
                    mInitialized = true;
                } catch (RemoteException e) {
                }
            }
            return sWindowSession;
        }
    }

    static final class SystemUiVisibilityInfo {
        int seq;
        int globalVisibility;
        int localValue;
        int localChanges;
    }

    public ViewRootImpl(Context context) {
        super();

        if (MEASURE_LATENCY) {
            if (lt == null) {
                lt = new LatencyTimer(100, 1000);
            }
        }

        // Initialize the statics when this class is first instantiated. This is
        // done here instead of in the static block because Zygote does not
        // allow the spawning of threads.
        getWindowSession(context.getMainLooper());

        mThread = Thread.currentThread();
        mLocation = new WindowLeaked(null);
        mLocation.fillInStackTrace();
        mWidth = -1;
        mHeight = -1;
        mDirty = new Rect();
        mTempRect = new Rect();
        mVisRect = new Rect();
        mWinFrame = new Rect();
        mWindow = new W(this);
        mTargetSdkVersion = context.getApplicationInfo().targetSdkVersion;
        mInputMethodCallback = new InputMethodCallback(this);
        mViewVisibility = View.GONE;
        mTransparentRegion = new Region();
        mPreviousTransparentRegion = new Region();
        mFirst = true; // true for the first time the view is added
        mAdded = false;
        mAccessibilityManager = AccessibilityManager.getInstance(context);
        mAccessibilityInteractionConnectionManager =
            new AccessibilityInteractionConnectionManager();
        mAccessibilityManager.addAccessibilityStateChangeListener(
                mAccessibilityInteractionConnectionManager);
        mAttachInfo = new View.AttachInfo(sWindowSession, mWindow, this, mHandler, this);
        mViewConfiguration = ViewConfiguration.get(context);
        mDensity = context.getResources().getDisplayMetrics().densityDpi;
        mFallbackEventHandler = PolicyManager.makeNewFallbackEventHandler(context);
        mProfileRendering = Boolean.parseBoolean(
                SystemProperties.get(PROPERTY_PROFILE_RENDERING, "false"));
        mChoreographer = Choreographer.getInstance();

        PowerManager powerManager = (PowerManager) context.getSystemService(Context.POWER_SERVICE);
        mAttachInfo.mScreenOn = powerManager.isScreenOn();
        loadSystemProperties();
    }

    /**
     * @return True if the application requests the use of a separate render thread,
     *         false otherwise
     */
    private static boolean isRenderThreadRequested(Context context) {
        if (USE_RENDER_THREAD) {
            synchronized (sRenderThreadQueryLock) {
                if (!sRenderThreadQueried) {
                    final PackageManager packageManager = context.getPackageManager();
                    final String packageName = context.getApplicationInfo().packageName;
                    try {
                        ApplicationInfo applicationInfo = packageManager.getApplicationInfo(packageName,
                                PackageManager.GET_META_DATA);
                        if (applicationInfo.metaData != null) {
                            sUseRenderThread = applicationInfo.metaData.getBoolean(
                                    "android.graphics.renderThread", false);
                        }
                    } catch (PackageManager.NameNotFoundException e) {
                    } finally {
                        sRenderThreadQueried = true;
                    }
                }
                return sUseRenderThread;
            }
        } else {
            return false;
        }
    }

    public static void addFirstDrawHandler(Runnable callback) {
        synchronized (sFirstDrawHandlers) {
            if (!sFirstDrawComplete) {
                sFirstDrawHandlers.add(callback);
            }
        }
    }

    public static void addConfigCallback(ComponentCallbacks callback) {
        synchronized (sConfigCallbacks) {
            sConfigCallbacks.add(callback);
        }
    }

    // FIXME for perf testing only
    private boolean mProfile = false;

    /**
     * Call this to profile the next traversal call.
     * FIXME for perf testing only. Remove eventually
     */
    public void profile() {
        mProfile = true;
    }

    /**
     * Indicates whether we are in touch mode. Calling this method triggers an IPC
     * call and should be avoided whenever possible.
     *
     * @return True, if the device is in touch mode, false otherwise.
     *
     * @hide
     */
    static boolean isInTouchMode() {
        if (mInitialized) {
            try {
                return sWindowSession.getInTouchMode();
            } catch (RemoteException e) {
            }
        }
        return false;
    }

    /**
     * We have one child
     */
    public void setView(View view, WindowManager.LayoutParams attrs, View panelParentView) {
        synchronized (this) {
            if (mView == null) {
                mView = view;
                mFallbackEventHandler.setView(view);
                mWindowAttributes.copyFrom(attrs);
                attrs = mWindowAttributes;
                // Keep track of the actual window flags supplied by the client.
                mClientWindowLayoutFlags = attrs.flags;

                setAccessibilityFocus(null, null);

                if (view instanceof RootViewSurfaceTaker) {
                    mSurfaceHolderCallback =
                            ((RootViewSurfaceTaker)view).willYouTakeTheSurface();
                    if (mSurfaceHolderCallback != null) {
                        mSurfaceHolder = new TakenSurfaceHolder();
                        mSurfaceHolder.setFormat(PixelFormat.UNKNOWN);
                    }
                }

                CompatibilityInfo compatibilityInfo = mCompatibilityInfo.get();
                mTranslator = compatibilityInfo.getTranslator();

                // If the application owns the surface, don't enable hardware acceleration
                if (mSurfaceHolder == null) {
                    enableHardwareAcceleration(mView.getContext(), attrs);
                }

                boolean restore = false;
                if (mTranslator != null) {
                    mSurface.setCompatibilityTranslator(mTranslator);
                    restore = true;
                    attrs.backup();
                    mTranslator.translateWindowLayout(attrs);
                }
                if (DEBUG_LAYOUT) Log.d(TAG, "WindowLayout in setView:" + attrs);

                if (!compatibilityInfo.supportsScreen()) {
                    attrs.flags |= WindowManager.LayoutParams.FLAG_COMPATIBLE_WINDOW;
                    mLastInCompatMode = true;
                }

                mSoftInputMode = attrs.softInputMode;
                mWindowAttributesChanged = true;
                mWindowAttributesChangesFlag = WindowManager.LayoutParams.EVERYTHING_CHANGED;
                mAttachInfo.mRootView = view;
                mAttachInfo.mScalingRequired = mTranslator != null;
                mAttachInfo.mApplicationScale =
                        mTranslator == null ? 1.0f : mTranslator.applicationScale;
                if (panelParentView != null) {
                    mAttachInfo.mPanelParentWindowToken
                            = panelParentView.getApplicationWindowToken();
                }
                mAdded = true;
                int res; /* = WindowManagerImpl.ADD_OKAY; */

                // Schedule the first layout -before- adding to the window
                // manager, to make sure we do the relayout before receiving
                // any other events from the system.
                requestLayout();
                if ((mWindowAttributes.inputFeatures
                        & WindowManager.LayoutParams.INPUT_FEATURE_NO_INPUT_CHANNEL) == 0) {
                    mInputChannel = new InputChannel();
                }
                try {
                    mOrigWindowType = mWindowAttributes.type;
                    mAttachInfo.mRecomputeGlobalAttributes = true;
                    collectViewAttributes();
                    res = sWindowSession.add(mWindow, mSeq, mWindowAttributes,
                            getHostVisibility(), mAttachInfo.mContentInsets,
                            mInputChannel);
                } catch (RemoteException e) {
                    mAdded = false;
                    mView = null;
                    mAttachInfo.mRootView = null;
                    mInputChannel = null;
                    mFallbackEventHandler.setView(null);
                    unscheduleTraversals();
                    setAccessibilityFocus(null, null);
                    throw new RuntimeException("Adding window failed", e);
                } finally {
                    if (restore) {
                        attrs.restore();
                    }
                }

                if (mTranslator != null) {
                    mTranslator.translateRectInScreenToAppWindow(mAttachInfo.mContentInsets);
                }
                mPendingContentInsets.set(mAttachInfo.mContentInsets);
                mPendingVisibleInsets.set(0, 0, 0, 0);
                if (DEBUG_LAYOUT) Log.v(TAG, "Added window " + mWindow);
                if (res < WindowManagerImpl.ADD_OKAY) {
                    mView = null;
                    mAttachInfo.mRootView = null;
                    mAdded = false;
                    mFallbackEventHandler.setView(null);
                    unscheduleTraversals();
                    setAccessibilityFocus(null, null);
                    switch (res) {
                        case WindowManagerImpl.ADD_BAD_APP_TOKEN:
                        case WindowManagerImpl.ADD_BAD_SUBWINDOW_TOKEN:
                            throw new WindowManagerImpl.BadTokenException(
                                "Unable to add window -- token " + attrs.token
                                + " is not valid; is your activity running?");
                        case WindowManagerImpl.ADD_NOT_APP_TOKEN:
                            throw new WindowManagerImpl.BadTokenException(
                                "Unable to add window -- token " + attrs.token
                                + " is not for an application");
                        case WindowManagerImpl.ADD_APP_EXITING:
                            throw new WindowManagerImpl.BadTokenException(
                                "Unable to add window -- app for token " + attrs.token
                                + " is exiting");
                        case WindowManagerImpl.ADD_DUPLICATE_ADD:
                            throw new WindowManagerImpl.BadTokenException(
                                "Unable to add window -- window " + mWindow
                                + " has already been added");
                        case WindowManagerImpl.ADD_STARTING_NOT_NEEDED:
                            // Silently ignore -- we would have just removed it
                            // right away, anyway.
                            return;
                        case WindowManagerImpl.ADD_MULTIPLE_SINGLETON:
                            throw new WindowManagerImpl.BadTokenException(
                                "Unable to add window " + mWindow +
                                " -- another window of this type already exists");
                        case WindowManagerImpl.ADD_PERMISSION_DENIED:
                            throw new WindowManagerImpl.BadTokenException(
                                "Unable to add window " + mWindow +
                                " -- permission denied for this window type");
                    }
                    throw new RuntimeException(
                        "Unable to add window -- unknown error code " + res);
                }

                if (view instanceof RootViewSurfaceTaker) {
                    mInputQueueCallback =
                        ((RootViewSurfaceTaker)view).willYouTakeTheInputQueue();
                }
                if (mInputChannel != null) {
                    if (mInputQueueCallback != null) {
                        mInputQueue = new InputQueue(mInputChannel);
                        mInputQueueCallback.onInputQueueCreated(mInputQueue);
                    } else {
                        mInputEventReceiver = new WindowInputEventReceiver(mInputChannel,
                                Looper.myLooper());
                    }
                }

                view.assignParent(this);
                mAddedTouchMode = (res&WindowManagerImpl.ADD_FLAG_IN_TOUCH_MODE) != 0;
                mAppVisible = (res&WindowManagerImpl.ADD_FLAG_APP_VISIBLE) != 0;

                if (mAccessibilityManager.isEnabled()) {
                    mAccessibilityInteractionConnectionManager.ensureConnection();
                }

                if (view.getImportantForAccessibility() == View.IMPORTANT_FOR_ACCESSIBILITY_AUTO) {
                    view.setImportantForAccessibility(View.IMPORTANT_FOR_ACCESSIBILITY_YES);
                }
            }
        }
    }

    void destroyHardwareResources() {
        if (mAttachInfo.mHardwareRenderer != null) {
            if (mAttachInfo.mHardwareRenderer.isEnabled()) {
                mAttachInfo.mHardwareRenderer.destroyLayers(mView);
            }
            mAttachInfo.mHardwareRenderer.destroy(false);
        }
    }

    void terminateHardwareResources() {
        if (mAttachInfo.mHardwareRenderer != null) {
            mAttachInfo.mHardwareRenderer.destroyHardwareResources(mView);
            mAttachInfo.mHardwareRenderer.destroy(false);
        }
    }

    void destroyHardwareLayers() {
        if (mThread != Thread.currentThread()) {
            if (mAttachInfo.mHardwareRenderer != null &&
                    mAttachInfo.mHardwareRenderer.isEnabled()) {
                HardwareRenderer.trimMemory(ComponentCallbacks2.TRIM_MEMORY_MODERATE);
            }
        } else {
            if (mAttachInfo.mHardwareRenderer != null &&
                    mAttachInfo.mHardwareRenderer.isEnabled()) {
                mAttachInfo.mHardwareRenderer.destroyLayers(mView);
            }
        }
    }

    public boolean attachFunctor(int functor) {
        //noinspection SimplifiableIfStatement
        if (mAttachInfo.mHardwareRenderer != null && mAttachInfo.mHardwareRenderer.isEnabled()) {
            return mAttachInfo.mHardwareRenderer.attachFunctor(mAttachInfo, functor);
        }
        return false;
    }

    public void detachFunctor(int functor) {
        if (mAttachInfo.mHardwareRenderer != null) {
            mAttachInfo.mHardwareRenderer.detachFunctor(functor);
        }
    }

    private void enableHardwareAcceleration(Context context, WindowManager.LayoutParams attrs) {
        mAttachInfo.mHardwareAccelerated = false;
        mAttachInfo.mHardwareAccelerationRequested = false;

        // Don't enable hardware acceleration when the application is in compatibility mode
        if (mTranslator != null) return;

        // Try to enable hardware acceleration if requested
        final boolean hardwareAccelerated =
                (attrs.flags & WindowManager.LayoutParams.FLAG_HARDWARE_ACCELERATED) != 0;

        if (hardwareAccelerated) {
            if (!HardwareRenderer.isAvailable()) {
                return;
            }

            // Persistent processes (including the system) should not do
            // accelerated rendering on low-end devices.  In that case,
            // sRendererDisabled will be set.  In addition, the system process
            // itself should never do accelerated rendering.  In that case, both
            // sRendererDisabled and sSystemRendererDisabled are set.  When
            // sSystemRendererDisabled is set, PRIVATE_FLAG_FORCE_HARDWARE_ACCELERATED
            // can be used by code on the system process to escape that and enable
            // HW accelerated drawing.  (This is basically for the lock screen.)

            final boolean fakeHwAccelerated = (attrs.privateFlags &
                    WindowManager.LayoutParams.PRIVATE_FLAG_FAKE_HARDWARE_ACCELERATED) != 0;
            final boolean forceHwAccelerated = (attrs.privateFlags &
                    WindowManager.LayoutParams.PRIVATE_FLAG_FORCE_HARDWARE_ACCELERATED) != 0;

            if (!HardwareRenderer.sRendererDisabled || (HardwareRenderer.sSystemRendererDisabled
                    && forceHwAccelerated)) {
                // Don't enable hardware acceleration when we're not on the main thread
                if (!HardwareRenderer.sSystemRendererDisabled &&
                        Looper.getMainLooper() != Looper.myLooper()) {
                    Log.w(HardwareRenderer.LOG_TAG, "Attempting to initialize hardware "
                            + "acceleration outside of the main thread, aborting");
                    return;
                }

                final boolean renderThread = isRenderThreadRequested(context);
                if (renderThread) {
                    Log.i(HardwareRenderer.LOG_TAG, "Render threat initiated");
                }

                if (mAttachInfo.mHardwareRenderer != null) {
                    mAttachInfo.mHardwareRenderer.destroy(true);
                }

                final boolean translucent = attrs.format != PixelFormat.OPAQUE;
                mAttachInfo.mHardwareRenderer = HardwareRenderer.createGlRenderer(2, translucent);
                mAttachInfo.mHardwareAccelerated = mAttachInfo.mHardwareAccelerationRequested
                        = mAttachInfo.mHardwareRenderer != null;

            } else if (fakeHwAccelerated) {
                // The window had wanted to use hardware acceleration, but this
                // is not allowed in its process.  By setting this flag, it can
                // still render as if it was accelerated.  This is basically for
                // the preview windows the window manager shows for launching
                // applications, so they will look more like the app being launched.
                mAttachInfo.mHardwareAccelerationRequested = true;
            }
        }
    }

    public View getView() {
        return mView;
    }

    final WindowLeaked getLocation() {
        return mLocation;
    }

    void setLayoutParams(WindowManager.LayoutParams attrs, boolean newView) {
        synchronized (this) {
            int oldSoftInputMode = mWindowAttributes.softInputMode;
            // Keep track of the actual window flags supplied by the client.
            mClientWindowLayoutFlags = attrs.flags;
            // preserve compatible window flag if exists.
            int compatibleWindowFlag =
                mWindowAttributes.flags & WindowManager.LayoutParams.FLAG_COMPATIBLE_WINDOW;
            // transfer over system UI visibility values as they carry current state.
            attrs.systemUiVisibility = mWindowAttributes.systemUiVisibility;
            attrs.subtreeSystemUiVisibility = mWindowAttributes.subtreeSystemUiVisibility;
            mWindowAttributesChangesFlag = mWindowAttributes.copyFrom(attrs);
            mWindowAttributes.flags |= compatibleWindowFlag;

            applyKeepScreenOnFlag(mWindowAttributes);

            if (newView) {
                mSoftInputMode = attrs.softInputMode;
                requestLayout();
            }
            // Don't lose the mode we last auto-computed.
            if ((attrs.softInputMode&WindowManager.LayoutParams.SOFT_INPUT_MASK_ADJUST)
                    == WindowManager.LayoutParams.SOFT_INPUT_ADJUST_UNSPECIFIED) {
                mWindowAttributes.softInputMode = (mWindowAttributes.softInputMode
                        & ~WindowManager.LayoutParams.SOFT_INPUT_MASK_ADJUST)
                        | (oldSoftInputMode
                                & WindowManager.LayoutParams.SOFT_INPUT_MASK_ADJUST);
            }
            mWindowAttributesChanged = true;
            scheduleTraversals();
        }
    }

    void handleAppVisibility(boolean visible) {
        if (mAppVisible != visible) {
            mAppVisible = visible;
            scheduleTraversals();
        }
    }

    void handleGetNewSurface() {
        mNewSurfaceNeeded = true;
        mFullRedrawNeeded = true;
        scheduleTraversals();
    }

    void handleScreenStateChange(boolean on) {
        if (on != mAttachInfo.mScreenOn) {
            mAttachInfo.mScreenOn = on;
            if (mView != null) {
                mView.dispatchScreenStateChanged(on ? View.SCREEN_STATE_ON : View.SCREEN_STATE_OFF);
            }
            if (on) {
                mFullRedrawNeeded = true;
                scheduleTraversals();
            }
        }
    }

    /**
     * {@inheritDoc}
     */
    public void requestFitSystemWindows() {
        checkThread();
        mFitSystemWindowsRequested = true;
        scheduleTraversals();
    }

    /**
     * {@inheritDoc}
     */
    public void requestLayout() {
        checkThread();
        mLayoutRequested = true;
        scheduleTraversals();
    }

    /**
     * {@inheritDoc}
     */
    public boolean isLayoutRequested() {
        return mLayoutRequested;
    }

    void invalidate() {
        mDirty.set(0, 0, mWidth, mHeight);
        scheduleTraversals();
    }

    void invalidateWorld(View view) {
        view.invalidate();
        if (view instanceof ViewGroup) {
            ViewGroup parent = (ViewGroup)view;
            for (int i=0; i<parent.getChildCount(); i++) {
                invalidateWorld(parent.getChildAt(i));
            }
        }
    }

    public void invalidateChild(View child, Rect dirty) {
        invalidateChildInParent(null, dirty);
    }

    public ViewParent invalidateChildInParent(int[] location, Rect dirty) {
        checkThread();
        if (DEBUG_DRAW) Log.v(TAG, "Invalidate child: " + dirty);

        if (dirty == null) {
            invalidate();
            return null;
        } else if (dirty.isEmpty()) {
            return null;
        }

        if (mCurScrollY != 0 || mTranslator != null) {
            mTempRect.set(dirty);
            dirty = mTempRect;
            if (mCurScrollY != 0) {
                dirty.offset(0, -mCurScrollY);
            }
            if (mTranslator != null) {
                mTranslator.translateRectInAppWindowToScreen(dirty);
            }
            if (mAttachInfo.mScalingRequired) {
                dirty.inset(-1, -1);
            }
        }

        final Rect localDirty = mDirty;
        if (!localDirty.isEmpty() && !localDirty.contains(dirty)) {
            mAttachInfo.mSetIgnoreDirtyState = true;
            mAttachInfo.mIgnoreDirtyState = true;
        }

        // Add the new dirty rect to the current one
        localDirty.union(dirty.left, dirty.top, dirty.right, dirty.bottom);
        // Intersect with the bounds of the window to skip
        // updates that lie outside of the visible region
        final float appScale = mAttachInfo.mApplicationScale;
        localDirty.intersect(0, 0,
                (int) (mWidth * appScale + 0.5f), (int) (mHeight * appScale + 0.5f));

        if (!mWillDrawSoon) {
            scheduleTraversals();
        }

        return null;
    }

    void setStopped(boolean stopped) {
        if (mStopped != stopped) {
            mStopped = stopped;
            if (!stopped) {
                scheduleTraversals();
            }
        }
    }

    public ViewParent getParent() {
        return null;
    }

    public boolean getChildVisibleRect(View child, Rect r, android.graphics.Point offset) {
        if (child != mView) {
            throw new RuntimeException("child is not mine, honest!");
        }
        // Note: don't apply scroll offset, because we want to know its
        // visibility in the virtual canvas being given to the view hierarchy.
        return r.intersect(0, 0, mWidth, mHeight);
    }

    public void bringChildToFront(View child) {
    }

    int getHostVisibility() {
        return mAppVisible ? mView.getVisibility() : View.GONE;
    }

    void disposeResizeBuffer() {
        if (mResizeBuffer != null) {
            mResizeBuffer.destroy();
            mResizeBuffer = null;
        }
    }

    /**
     * Add LayoutTransition to the list of transitions to be started in the next traversal.
     * This list will be cleared after the transitions on the list are start()'ed. These
     * transitionsa re added by LayoutTransition itself when it sets up animations. The setup
     * happens during the layout phase of traversal, which we want to complete before any of the
     * animations are started (because those animations may side-effect properties that layout
     * depends upon, like the bounding rectangles of the affected views). So we add the transition
     * to the list and it is started just prior to starting the drawing phase of traversal.
     *
     * @param transition The LayoutTransition to be started on the next traversal.
     *
     * @hide
     */
    public void requestTransitionStart(LayoutTransition transition) {
        if (mPendingTransitions == null || !mPendingTransitions.contains(transition)) {
            if (mPendingTransitions == null) {
                 mPendingTransitions = new ArrayList<LayoutTransition>();
            }
            mPendingTransitions.add(transition);
        }
    }

    void scheduleTraversals() {
        if (!mTraversalScheduled) {
            mTraversalScheduled = true;
            mTraversalBarrier = mHandler.getLooper().postSyncBarrier();
            mChoreographer.postCallback(
                    Choreographer.CALLBACK_TRAVERSAL, mTraversalRunnable, null);
            scheduleConsumeBatchedInput();
        }
    }

    void unscheduleTraversals() {
        if (mTraversalScheduled) {
            mTraversalScheduled = false;
            mHandler.getLooper().removeSyncBarrier(mTraversalBarrier);
            mChoreographer.removeCallbacks(
                    Choreographer.CALLBACK_TRAVERSAL, mTraversalRunnable, null);
        }
    }

    void doTraversal() {
        if (mTraversalScheduled) {
            mTraversalScheduled = false;
            mHandler.getLooper().removeSyncBarrier(mTraversalBarrier);

            if (mProfile) {
                Debug.startMethodTracing("ViewAncestor");
            }

            Trace.traceBegin(Trace.TRACE_TAG_VIEW, "performTraversals");
            try {
                performTraversals();
            } finally {
                Trace.traceEnd(Trace.TRACE_TAG_VIEW);
            }

            if (mProfile) {
                Debug.stopMethodTracing();
                mProfile = false;
            }
        }
    }

    private void applyKeepScreenOnFlag(WindowManager.LayoutParams params) {
        // Update window's global keep screen on flag: if a view has requested
        // that the screen be kept on, then it is always set; otherwise, it is
        // set to whatever the client last requested for the global state.
        if (mAttachInfo.mKeepScreenOn) {
            params.flags |= WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON;
        } else {
            params.flags = (params.flags&~WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON)
                    | (mClientWindowLayoutFlags&WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
        }
    }

    private boolean collectViewAttributes() {
        final View.AttachInfo attachInfo = mAttachInfo;
        if (attachInfo.mRecomputeGlobalAttributes) {
            //Log.i(TAG, "Computing view hierarchy attributes!");
            attachInfo.mRecomputeGlobalAttributes = false;
            boolean oldScreenOn = attachInfo.mKeepScreenOn;
            int oldVis = attachInfo.mSystemUiVisibility;
            boolean oldHasSystemUiListeners = attachInfo.mHasSystemUiListeners;
            attachInfo.mKeepScreenOn = false;
            attachInfo.mSystemUiVisibility = 0;
            attachInfo.mHasSystemUiListeners = false;
            mView.dispatchCollectViewAttributes(attachInfo, 0);
            attachInfo.mSystemUiVisibility &= ~attachInfo.mDisabledSystemUiVisibility;
            if (attachInfo.mKeepScreenOn != oldScreenOn
                    || attachInfo.mSystemUiVisibility != oldVis
                    || attachInfo.mHasSystemUiListeners != oldHasSystemUiListeners) {
                WindowManager.LayoutParams params = mWindowAttributes;
                applyKeepScreenOnFlag(params);
                params.subtreeSystemUiVisibility = attachInfo.mSystemUiVisibility;
                params.hasSystemUiListeners = attachInfo.mHasSystemUiListeners;
                mView.dispatchWindowSystemUiVisiblityChanged(attachInfo.mSystemUiVisibility);
                return true;
            }
        }
        return false;
    }

    private boolean measureHierarchy(final View host, final WindowManager.LayoutParams lp,
            final Resources res, final int desiredWindowWidth, final int desiredWindowHeight) {
        int childWidthMeasureSpec;
        int childHeightMeasureSpec;
        boolean windowSizeMayChange = false;

        if (DEBUG_ORIENTATION || DEBUG_LAYOUT) Log.v(TAG,
                "Measuring " + host + " in display " + desiredWindowWidth
                + "x" + desiredWindowHeight + "...");

        boolean goodMeasure = false;
        if (lp.width == ViewGroup.LayoutParams.WRAP_CONTENT) {
            // On large screens, we don't want to allow dialogs to just
            // stretch to fill the entire width of the screen to display
            // one line of text.  First try doing the layout at a smaller
            // size to see if it will fit.
            final DisplayMetrics packageMetrics = res.getDisplayMetrics();
            res.getValue(com.android.internal.R.dimen.config_prefDialogWidth, mTmpValue, true);
            int baseSize = 0;
            if (mTmpValue.type == TypedValue.TYPE_DIMENSION) {
                baseSize = (int)mTmpValue.getDimension(packageMetrics);
            }
            if (DEBUG_DIALOG) Log.v(TAG, "Window " + mView + ": baseSize=" + baseSize);
            if (baseSize != 0 && desiredWindowWidth > baseSize) {
                childWidthMeasureSpec = getRootMeasureSpec(baseSize, lp.width);
                childHeightMeasureSpec = getRootMeasureSpec(desiredWindowHeight, lp.height);
                performMeasure(childWidthMeasureSpec, childHeightMeasureSpec);
                if (DEBUG_DIALOG) Log.v(TAG, "Window " + mView + ": measured ("
                        + host.getMeasuredWidth() + "," + host.getMeasuredHeight() + ")");
                if ((host.getMeasuredWidthAndState()&View.MEASURED_STATE_TOO_SMALL) == 0) {
                    goodMeasure = true;
                } else {
                    // Didn't fit in that size... try expanding a bit.
                    baseSize = (baseSize+desiredWindowWidth)/2;
                    if (DEBUG_DIALOG) Log.v(TAG, "Window " + mView + ": next baseSize="
                            + baseSize);
                    childWidthMeasureSpec = getRootMeasureSpec(baseSize, lp.width);
                    performMeasure(childWidthMeasureSpec, childHeightMeasureSpec);
                    if (DEBUG_DIALOG) Log.v(TAG, "Window " + mView + ": measured ("
                            + host.getMeasuredWidth() + "," + host.getMeasuredHeight() + ")");
                    if ((host.getMeasuredWidthAndState()&View.MEASURED_STATE_TOO_SMALL) == 0) {
                        if (DEBUG_DIALOG) Log.v(TAG, "Good!");
                        goodMeasure = true;
                    }
                }
            }
        }

        if (!goodMeasure) {
            childWidthMeasureSpec = getRootMeasureSpec(desiredWindowWidth, lp.width);
            childHeightMeasureSpec = getRootMeasureSpec(desiredWindowHeight, lp.height);
            performMeasure(childWidthMeasureSpec, childHeightMeasureSpec);
            if (mWidth != host.getMeasuredWidth() || mHeight != host.getMeasuredHeight()) {
                windowSizeMayChange = true;
            }
        }

        if (DBG) {
            System.out.println("======================================");
            System.out.println("performTraversals -- after measure");
            host.debug();
        }

        return windowSizeMayChange;
    }

    private void performTraversals() {
        // cache mView since it is used so much below...
        final View host = mView;

        if (DBG) {
            System.out.println("======================================");
            System.out.println("performTraversals");
            host.debug();
        }

        if (host == null || !mAdded)
            return;

        mWillDrawSoon = true;
        boolean windowSizeMayChange = false;
        boolean newSurface = false;
        boolean surfaceChanged = false;
        WindowManager.LayoutParams lp = mWindowAttributes;

        int desiredWindowWidth;
        int desiredWindowHeight;

        final View.AttachInfo attachInfo = mAttachInfo;

        final int viewVisibility = getHostVisibility();
        boolean viewVisibilityChanged = mViewVisibility != viewVisibility
                || mNewSurfaceNeeded;

        WindowManager.LayoutParams params = null;
        if (mWindowAttributesChanged) {
            mWindowAttributesChanged = false;
            surfaceChanged = true;
            params = lp;
        }
        CompatibilityInfo compatibilityInfo = mCompatibilityInfo.get();
        if (compatibilityInfo.supportsScreen() == mLastInCompatMode) {
            params = lp;
            mFullRedrawNeeded = true;
            mLayoutRequested = true;
            if (mLastInCompatMode) {
                params.flags &= ~WindowManager.LayoutParams.FLAG_COMPATIBLE_WINDOW;
                mLastInCompatMode = false;
            } else {
                params.flags |= WindowManager.LayoutParams.FLAG_COMPATIBLE_WINDOW;
                mLastInCompatMode = true;
            }
        }

        mWindowAttributesChangesFlag = 0;

        Rect frame = mWinFrame;
        if (mFirst) {
            mFullRedrawNeeded = true;
            mLayoutRequested = true;

            if (lp.type == WindowManager.LayoutParams.TYPE_STATUS_BAR_PANEL) {
                // NOTE -- system code, won't try to do compat mode.
                Display disp = WindowManagerImpl.getDefault().getDefaultDisplay();
                Point size = new Point();
                disp.getRealSize(size);
                desiredWindowWidth = size.x;
                desiredWindowHeight = size.y;
            } else {
                DisplayMetrics packageMetrics =
                    mView.getContext().getResources().getDisplayMetrics();
                desiredWindowWidth = packageMetrics.widthPixels;
                desiredWindowHeight = packageMetrics.heightPixels;
            }

            // For the very first time, tell the view hierarchy that it
            // is attached to the window.  Note that at this point the surface
            // object is not initialized to its backing store, but soon it
            // will be (assuming the window is visible).
            attachInfo.mSurface = mSurface;
            // We used to use the following condition to choose 32 bits drawing caches:
            // PixelFormat.hasAlpha(lp.format) || lp.format == PixelFormat.RGBX_8888
            // However, windows are now always 32 bits by default, so choose 32 bits
            attachInfo.mUse32BitDrawingCache = true;
            attachInfo.mHasWindowFocus = false;
            attachInfo.mWindowVisibility = viewVisibility;
            attachInfo.mRecomputeGlobalAttributes = false;
            viewVisibilityChanged = false;
            mLastConfiguration.setTo(host.getResources().getConfiguration());
            mLastSystemUiVisibility = mAttachInfo.mSystemUiVisibility;
            host.dispatchAttachedToWindow(attachInfo, 0);
            mFitSystemWindowsInsets.set(mAttachInfo.mContentInsets);
            host.fitSystemWindows(mFitSystemWindowsInsets);
            //Log.i(TAG, "Screen on initialized: " + attachInfo.mKeepScreenOn);

        } else {
            desiredWindowWidth = frame.width();
            desiredWindowHeight = frame.height();
            if (desiredWindowWidth != mWidth || desiredWindowHeight != mHeight) {
                if (DEBUG_ORIENTATION) Log.v(TAG,
                        "View " + host + " resized to: " + frame);
                mFullRedrawNeeded = true;
                mLayoutRequested = true;
                windowSizeMayChange = true;
            }
        }

        if (viewVisibilityChanged) {
            attachInfo.mWindowVisibility = viewVisibility;
            host.dispatchWindowVisibilityChanged(viewVisibility);
            if (viewVisibility != View.VISIBLE || mNewSurfaceNeeded) {
                destroyHardwareResources();
            }
            if (viewVisibility == View.GONE) {
                // After making a window gone, we will count it as being
                // shown for the first time the next time it gets focus.
                mHasHadWindowFocus = false;
            }
        }

        // Execute enqueued actions on every traversal in case a detached view enqueued an action
        getRunQueue().executeActions(attachInfo.mHandler);

        boolean insetsChanged = false;

        boolean layoutRequested = mLayoutRequested && !mStopped;
        if (layoutRequested) {

            final Resources res = mView.getContext().getResources();

            if (mFirst) {
                // make sure touch mode code executes by setting cached value
                // to opposite of the added touch mode.
                mAttachInfo.mInTouchMode = !mAddedTouchMode;
                ensureTouchModeLocally(mAddedTouchMode);
            } else {
                if (!mPendingContentInsets.equals(mAttachInfo.mContentInsets)) {
                    insetsChanged = true;
                }
                if (!mPendingVisibleInsets.equals(mAttachInfo.mVisibleInsets)) {
                    mAttachInfo.mVisibleInsets.set(mPendingVisibleInsets);
                    if (DEBUG_LAYOUT) Log.v(TAG, "Visible insets changing to: "
                            + mAttachInfo.mVisibleInsets);
                }
                if (lp.width == ViewGroup.LayoutParams.WRAP_CONTENT
                        || lp.height == ViewGroup.LayoutParams.WRAP_CONTENT) {
                    windowSizeMayChange = true;

                    if (lp.type == WindowManager.LayoutParams.TYPE_STATUS_BAR_PANEL) {
                        // NOTE -- system code, won't try to do compat mode.
                        Display disp = WindowManagerImpl.getDefault().getDefaultDisplay();
                        Point size = new Point();
                        disp.getRealSize(size);
                        desiredWindowWidth = size.x;
                        desiredWindowHeight = size.y;
                    } else {
                        DisplayMetrics packageMetrics = res.getDisplayMetrics();
                        desiredWindowWidth = packageMetrics.widthPixels;
                        desiredWindowHeight = packageMetrics.heightPixels;
                    }
                }
            }

            // Ask host how big it wants to be
            windowSizeMayChange |= measureHierarchy(host, lp, res,
                    desiredWindowWidth, desiredWindowHeight);
        }

        if (collectViewAttributes()) {
            params = lp;
        }
        if (attachInfo.mForceReportNewAttributes) {
            attachInfo.mForceReportNewAttributes = false;
            params = lp;
        }

        if (mFirst || attachInfo.mViewVisibilityChanged) {
            attachInfo.mViewVisibilityChanged = false;
            int resizeMode = mSoftInputMode &
                    WindowManager.LayoutParams.SOFT_INPUT_MASK_ADJUST;
            // If we are in auto resize mode, then we need to determine
            // what mode to use now.
            if (resizeMode == WindowManager.LayoutParams.SOFT_INPUT_ADJUST_UNSPECIFIED) {
                final int N = attachInfo.mScrollContainers.size();
                for (int i=0; i<N; i++) {
                    if (attachInfo.mScrollContainers.get(i).isShown()) {
                        resizeMode = WindowManager.LayoutParams.SOFT_INPUT_ADJUST_RESIZE;
                    }
                }
                if (resizeMode == 0) {
                    resizeMode = WindowManager.LayoutParams.SOFT_INPUT_ADJUST_PAN;
                }
                if ((lp.softInputMode &
                        WindowManager.LayoutParams.SOFT_INPUT_MASK_ADJUST) != resizeMode) {
                    lp.softInputMode = (lp.softInputMode &
                            ~WindowManager.LayoutParams.SOFT_INPUT_MASK_ADJUST) |
                            resizeMode;
                    params = lp;
                }
            }
        }

        if (params != null && (host.mPrivateFlags & View.REQUEST_TRANSPARENT_REGIONS) != 0) {
            if (!PixelFormat.formatHasAlpha(params.format)) {
                params.format = PixelFormat.TRANSLUCENT;
            }
        }

        if (mFitSystemWindowsRequested) {
            mFitSystemWindowsRequested = false;
            mFitSystemWindowsInsets.set(mAttachInfo.mContentInsets);
            host.fitSystemWindows(mFitSystemWindowsInsets);
            if (mLayoutRequested) {
                // Short-circuit catching a new layout request here, so
                // we don't need to go through two layout passes when things
                // change due to fitting system windows, which can happen a lot.
                windowSizeMayChange |= measureHierarchy(host, lp,
                        mView.getContext().getResources(),
                        desiredWindowWidth, desiredWindowHeight);
            }
        }

        if (layoutRequested) {
            // Clear this now, so that if anything requests a layout in the
            // rest of this function we will catch it and re-run a full
            // layout pass.
            mLayoutRequested = false;
        }

        boolean windowShouldResize = layoutRequested && windowSizeMayChange
            && ((mWidth != host.getMeasuredWidth() || mHeight != host.getMeasuredHeight())
                || (lp.width == ViewGroup.LayoutParams.WRAP_CONTENT &&
                        frame.width() < desiredWindowWidth && frame.width() != mWidth)
                || (lp.height == ViewGroup.LayoutParams.WRAP_CONTENT &&
                        frame.height() < desiredWindowHeight && frame.height() != mHeight));

        final boolean computesInternalInsets =
                attachInfo.mTreeObserver.hasComputeInternalInsetsListeners();

        boolean insetsPending = false;
        int relayoutResult = 0;

        if (mFirst || windowShouldResize || insetsChanged ||
                viewVisibilityChanged || params != null) {

            if (viewVisibility == View.VISIBLE) {
                // If this window is giving internal insets to the window
                // manager, and it is being added or changing its visibility,
                // then we want to first give the window manager "fake"
                // insets to cause it to effectively ignore the content of
                // the window during layout.  This avoids it briefly causing
                // other windows to resize/move based on the raw frame of the
                // window, waiting until we can finish laying out this window
                // and get back to the window manager with the ultimately
                // computed insets.
                insetsPending = computesInternalInsets && (mFirst || viewVisibilityChanged);
            }

            if (mSurfaceHolder != null) {
                mSurfaceHolder.mSurfaceLock.lock();
                mDrawingAllowed = true;
            }

            boolean hwInitialized = false;
            boolean contentInsetsChanged = false;
            boolean visibleInsetsChanged;
            boolean hadSurface = mSurface.isValid();

            try {
                if (DEBUG_LAYOUT) {
                    Log.i(TAG, "host=w:" + host.getMeasuredWidth() + ", h:" +
                            host.getMeasuredHeight() + ", params=" + params);
                }

                final int surfaceGenerationId = mSurface.getGenerationId();
                relayoutResult = relayoutWindow(params, viewVisibility, insetsPending);

                if (DEBUG_LAYOUT) Log.v(TAG, "relayout: frame=" + frame.toShortString()
                        + " content=" + mPendingContentInsets.toShortString()
                        + " visible=" + mPendingVisibleInsets.toShortString()
                        + " surface=" + mSurface);

                if (mPendingConfiguration.seq != 0) {
                    if (DEBUG_CONFIGURATION) Log.v(TAG, "Visible with new config: "
                            + mPendingConfiguration);
                    updateConfiguration(mPendingConfiguration, !mFirst);
                    mPendingConfiguration.seq = 0;
                }

                contentInsetsChanged = !mPendingContentInsets.equals(
                        mAttachInfo.mContentInsets);
                visibleInsetsChanged = !mPendingVisibleInsets.equals(
                        mAttachInfo.mVisibleInsets);
                if (contentInsetsChanged) {
                    if (mWidth > 0 && mHeight > 0 && lp != null &&
                            ((lp.systemUiVisibility|lp.subtreeSystemUiVisibility)
                                    & View.SYSTEM_UI_LAYOUT_FLAGS) == 0 &&
                            mSurface != null && mSurface.isValid() &&
                            !mAttachInfo.mTurnOffWindowResizeAnim &&
                            mAttachInfo.mHardwareRenderer != null &&
                            mAttachInfo.mHardwareRenderer.isEnabled() &&
                            mAttachInfo.mHardwareRenderer.validate() &&
                            lp != null && !PixelFormat.formatHasAlpha(lp.format)) {

                        disposeResizeBuffer();

                        boolean completed = false;
                        HardwareCanvas hwRendererCanvas = mAttachInfo.mHardwareRenderer.getCanvas();
                        HardwareCanvas layerCanvas = null;
                        try {
                            if (mResizeBuffer == null) {
                                mResizeBuffer = mAttachInfo.mHardwareRenderer.createHardwareLayer(
                                        mWidth, mHeight, false);
                            } else if (mResizeBuffer.getWidth() != mWidth ||
                                    mResizeBuffer.getHeight() != mHeight) {
                                mResizeBuffer.resize(mWidth, mHeight);
                            }
                            layerCanvas = mResizeBuffer.start(hwRendererCanvas);
                            layerCanvas.setViewport(mWidth, mHeight);
                            layerCanvas.onPreDraw(null);
                            final int restoreCount = layerCanvas.save();

                            layerCanvas.drawColor(0xff000000, PorterDuff.Mode.SRC);

                            int yoff;
                            final boolean scrolling = mScroller != null
                                    && mScroller.computeScrollOffset();
                            if (scrolling) {
                                yoff = mScroller.getCurrY();
                                mScroller.abortAnimation();
                            } else {
                                yoff = mScrollY;
                            }

                            layerCanvas.translate(0, -yoff);
                            if (mTranslator != null) {
                                mTranslator.translateCanvas(layerCanvas);
                            }

                            mView.draw(layerCanvas);

                            drawAccessibilityFocusedDrawableIfNeeded(layerCanvas);

                            mResizeBufferStartTime = SystemClock.uptimeMillis();
                            mResizeBufferDuration = mView.getResources().getInteger(
                                    com.android.internal.R.integer.config_mediumAnimTime);
                            completed = true;

                            layerCanvas.restoreToCount(restoreCount);
                        } catch (OutOfMemoryError e) {
                            Log.w(TAG, "Not enough memory for content change anim buffer", e);
                        } finally {
                            if (layerCanvas != null) {
                                layerCanvas.onPostDraw();
                            }
                            if (mResizeBuffer != null) {
                                mResizeBuffer.end(hwRendererCanvas);
                                if (!completed) {
                                    mResizeBuffer.destroy();
                                    mResizeBuffer = null;
                                }
                            }
                        }
                    }
                    mAttachInfo.mContentInsets.set(mPendingContentInsets);
                    if (DEBUG_LAYOUT) Log.v(TAG, "Content insets changing to: "
                            + mAttachInfo.mContentInsets);
                }
                if (contentInsetsChanged || mLastSystemUiVisibility !=
                        mAttachInfo.mSystemUiVisibility || mFitSystemWindowsRequested) {
                    mLastSystemUiVisibility = mAttachInfo.mSystemUiVisibility;
                    mFitSystemWindowsRequested = false;
                    mFitSystemWindowsInsets.set(mAttachInfo.mContentInsets);
                    host.fitSystemWindows(mFitSystemWindowsInsets);
                }
                if (visibleInsetsChanged) {
                    mAttachInfo.mVisibleInsets.set(mPendingVisibleInsets);
                    if (DEBUG_LAYOUT) Log.v(TAG, "Visible insets changing to: "
                            + mAttachInfo.mVisibleInsets);
                }

                if (!hadSurface) {
                    if (mSurface.isValid()) {
                        // If we are creating a new surface, then we need to
                        // completely redraw it.  Also, when we get to the
                        // point of drawing it we will hold off and schedule
                        // a new traversal instead.  This is so we can tell the
                        // window manager about all of the windows being displayed
                        // before actually drawing them, so it can display then
                        // all at once.
                        newSurface = true;
                        mFullRedrawNeeded = true;
                        mPreviousTransparentRegion.setEmpty();

                        if (mAttachInfo.mHardwareRenderer != null) {
                            try {
                                hwInitialized = mAttachInfo.mHardwareRenderer.initialize(mHolder);
                            } catch (Surface.OutOfResourcesException e) {
                                Log.e(TAG, "OutOfResourcesException initializing HW surface", e);
                                try {
                                    if (!sWindowSession.outOfMemory(mWindow)) {
                                        Slog.w(TAG, "No processes killed for memory; killing self");
                                        Process.killProcess(Process.myPid());
                                    }
                                } catch (RemoteException ex) {
                                }
                                mLayoutRequested = true;    // ask wm for a new surface next time.
                                return;
                            }
                        }
                    }
                } else if (!mSurface.isValid()) {
                    // If the surface has been removed, then reset the scroll
                    // positions.
                    mLastScrolledFocus = null;
                    mScrollY = mCurScrollY = 0;
                    if (mScroller != null) {
                        mScroller.abortAnimation();
                    }
                    disposeResizeBuffer();
                    // Our surface is gone
                    if (mAttachInfo.mHardwareRenderer != null &&
                            mAttachInfo.mHardwareRenderer.isEnabled()) {
                        mAttachInfo.mHardwareRenderer.destroy(true);
                    }
                } else if (surfaceGenerationId != mSurface.getGenerationId() &&
                        mSurfaceHolder == null && mAttachInfo.mHardwareRenderer != null) {
                    mFullRedrawNeeded = true;
                    try {
                        mAttachInfo.mHardwareRenderer.updateSurface(mHolder);
                    } catch (Surface.OutOfResourcesException e) {
                        Log.e(TAG, "OutOfResourcesException updating HW surface", e);
                        try {
                            if (!sWindowSession.outOfMemory(mWindow)) {
                                Slog.w(TAG, "No processes killed for memory; killing self");
                                Process.killProcess(Process.myPid());
                            }
                        } catch (RemoteException ex) {
                        }
                        mLayoutRequested = true;    // ask wm for a new surface next time.
                        return;
                    }
                }
            } catch (RemoteException e) {
            }

            if (DEBUG_ORIENTATION) Log.v(
                    TAG, "Relayout returned: frame=" + frame + ", surface=" + mSurface);

            attachInfo.mWindowLeft = frame.left;
            attachInfo.mWindowTop = frame.top;

            // !!FIXME!! This next section handles the case where we did not get the
            // window size we asked for. We should avoid this by getting a maximum size from
            // the window session beforehand.
            if (mWidth != frame.width() || mHeight != frame.height()) {
                mWidth = frame.width();
                mHeight = frame.height();
            }

            if (mSurfaceHolder != null) {
                // The app owns the surface; tell it about what is going on.
                if (mSurface.isValid()) {
                    // XXX .copyFrom() doesn't work!
                    //mSurfaceHolder.mSurface.copyFrom(mSurface);
                    mSurfaceHolder.mSurface = mSurface;
                }
                mSurfaceHolder.setSurfaceFrameSize(mWidth, mHeight);
                mSurfaceHolder.mSurfaceLock.unlock();
                if (mSurface.isValid()) {
                    if (!hadSurface) {
                        mSurfaceHolder.ungetCallbacks();

                        mIsCreating = true;
                        mSurfaceHolderCallback.surfaceCreated(mSurfaceHolder);
                        SurfaceHolder.Callback callbacks[] = mSurfaceHolder.getCallbacks();
                        if (callbacks != null) {
                            for (SurfaceHolder.Callback c : callbacks) {
                                c.surfaceCreated(mSurfaceHolder);
                            }
                        }
                        surfaceChanged = true;
                    }
                    if (surfaceChanged) {
                        mSurfaceHolderCallback.surfaceChanged(mSurfaceHolder,
                                lp.format, mWidth, mHeight);
                        SurfaceHolder.Callback callbacks[] = mSurfaceHolder.getCallbacks();
                        if (callbacks != null) {
                            for (SurfaceHolder.Callback c : callbacks) {
                                c.surfaceChanged(mSurfaceHolder, lp.format,
                                        mWidth, mHeight);
                            }
                        }
                    }
                    mIsCreating = false;
                } else if (hadSurface) {
                    mSurfaceHolder.ungetCallbacks();
                    SurfaceHolder.Callback callbacks[] = mSurfaceHolder.getCallbacks();
                    mSurfaceHolderCallback.surfaceDestroyed(mSurfaceHolder);
                    if (callbacks != null) {
                        for (SurfaceHolder.Callback c : callbacks) {
                            c.surfaceDestroyed(mSurfaceHolder);
                        }
                    }
                    mSurfaceHolder.mSurfaceLock.lock();
                    try {
                        mSurfaceHolder.mSurface = new Surface();
                    } finally {
                        mSurfaceHolder.mSurfaceLock.unlock();
                    }
                }
            }

            if (mAttachInfo.mHardwareRenderer != null &&
                    mAttachInfo.mHardwareRenderer.isEnabled()) {
                if (hwInitialized || windowShouldResize ||
                        mWidth != mAttachInfo.mHardwareRenderer.getWidth() ||
                        mHeight != mAttachInfo.mHardwareRenderer.getHeight()) {
                    mAttachInfo.mHardwareRenderer.setup(mWidth, mHeight);
                    if (!hwInitialized) {
                        mAttachInfo.mHardwareRenderer.invalidate(mHolder);
                    }
                }
            }

            if (!mStopped) {
                boolean focusChangedDueToTouchMode = ensureTouchModeLocally(
                        (relayoutResult&WindowManagerImpl.RELAYOUT_RES_IN_TOUCH_MODE) != 0);
                if (focusChangedDueToTouchMode || mWidth != host.getMeasuredWidth()
                        || mHeight != host.getMeasuredHeight() || contentInsetsChanged) {
                    int childWidthMeasureSpec = getRootMeasureSpec(mWidth, lp.width);
                    int childHeightMeasureSpec = getRootMeasureSpec(mHeight, lp.height);

                    if (DEBUG_LAYOUT) Log.v(TAG, "Ooops, something changed!  mWidth="
                            + mWidth + " measuredWidth=" + host.getMeasuredWidth()
                            + " mHeight=" + mHeight
                            + " measuredHeight=" + host.getMeasuredHeight()
                            + " coveredInsetsChanged=" + contentInsetsChanged);

                     // Ask host how big it wants to be
                    performMeasure(childWidthMeasureSpec, childHeightMeasureSpec);

                    // Implementation of weights from WindowManager.LayoutParams
                    // We just grow the dimensions as needed and re-measure if
                    // needs be
                    int width = host.getMeasuredWidth();
                    int height = host.getMeasuredHeight();
                    boolean measureAgain = false;

                    if (lp.horizontalWeight > 0.0f) {
                        width += (int) ((mWidth - width) * lp.horizontalWeight);
                        childWidthMeasureSpec = MeasureSpec.makeMeasureSpec(width,
                                MeasureSpec.EXACTLY);
                        measureAgain = true;
                    }
                    if (lp.verticalWeight > 0.0f) {
                        height += (int) ((mHeight - height) * lp.verticalWeight);
                        childHeightMeasureSpec = MeasureSpec.makeMeasureSpec(height,
                                MeasureSpec.EXACTLY);
                        measureAgain = true;
                    }

                    if (measureAgain) {
                        if (DEBUG_LAYOUT) Log.v(TAG,
                                "And hey let's measure once more: width=" + width
                                + " height=" + height);
                        performMeasure(childWidthMeasureSpec, childHeightMeasureSpec);
                    }

                    layoutRequested = true;
                }
            }
        }

        final boolean didLayout = layoutRequested && !mStopped;
        boolean triggerGlobalLayoutListener = didLayout
                || attachInfo.mRecomputeGlobalAttributes;
        if (didLayout) {
            performLayout();

            // By this point all views have been sized and positionned
            // We can compute the transparent area

            if ((host.mPrivateFlags & View.REQUEST_TRANSPARENT_REGIONS) != 0) {
                // start out transparent
                // TODO: AVOID THAT CALL BY CACHING THE RESULT?
                host.getLocationInWindow(mTmpLocation);
                mTransparentRegion.set(mTmpLocation[0], mTmpLocation[1],
                        mTmpLocation[0] + host.mRight - host.mLeft,
                        mTmpLocation[1] + host.mBottom - host.mTop);

                host.gatherTransparentRegion(mTransparentRegion);
                if (mTranslator != null) {
                    mTranslator.translateRegionInWindowToScreen(mTransparentRegion);
                }

                if (!mTransparentRegion.equals(mPreviousTransparentRegion)) {
                    mPreviousTransparentRegion.set(mTransparentRegion);
                    // reconfigure window manager
                    try {
                        sWindowSession.setTransparentRegion(mWindow, mTransparentRegion);
                    } catch (RemoteException e) {
                    }
                }
            }

            if (DBG) {
                System.out.println("======================================");
                System.out.println("performTraversals -- after setFrame");
                host.debug();
            }
        }

        if (triggerGlobalLayoutListener) {
            attachInfo.mRecomputeGlobalAttributes = false;
            attachInfo.mTreeObserver.dispatchOnGlobalLayout();

            if (AccessibilityManager.getInstance(host.mContext).isEnabled()) {
                postSendWindowContentChangedCallback(mView);
            }
        }

        if (computesInternalInsets) {
            // Clear the original insets.
            final ViewTreeObserver.InternalInsetsInfo insets = attachInfo.mGivenInternalInsets;
            insets.reset();

            // Compute new insets in place.
            attachInfo.mTreeObserver.dispatchOnComputeInternalInsets(insets);

            // Tell the window manager.
            if (insetsPending || !mLastGivenInsets.equals(insets)) {
                mLastGivenInsets.set(insets);

                // Translate insets to screen coordinates if needed.
                final Rect contentInsets;
                final Rect visibleInsets;
                final Region touchableRegion;
                if (mTranslator != null) {
                    contentInsets = mTranslator.getTranslatedContentInsets(insets.contentInsets);
                    visibleInsets = mTranslator.getTranslatedVisibleInsets(insets.visibleInsets);
                    touchableRegion = mTranslator.getTranslatedTouchableArea(insets.touchableRegion);
                } else {
                    contentInsets = insets.contentInsets;
                    visibleInsets = insets.visibleInsets;
                    touchableRegion = insets.touchableRegion;
                }

                try {
                    sWindowSession.setInsets(mWindow, insets.mTouchableInsets,
                            contentInsets, visibleInsets, touchableRegion);
                } catch (RemoteException e) {
                }
            }
        }

        boolean skipDraw = false;

        if (mFirst) {
            // handle first focus request
            if (DEBUG_INPUT_RESIZE) Log.v(TAG, "First: mView.hasFocus()="
                    + mView.hasFocus());
            if (mView != null) {
                if (!mView.hasFocus()) {
                    mView.requestFocus(View.FOCUS_FORWARD);
                    mFocusedView = mRealFocusedView = mView.findFocus();
                    if (DEBUG_INPUT_RESIZE) Log.v(TAG, "First: requested focused view="
                            + mFocusedView);
                } else {
                    mRealFocusedView = mView.findFocus();
                    if (DEBUG_INPUT_RESIZE) Log.v(TAG, "First: existing focused view="
                            + mRealFocusedView);
                }
            }
            if ((relayoutResult&WindowManagerImpl.RELAYOUT_RES_ANIMATING) != 0) {
                // The first time we relayout the window, if the system is
                // doing window animations, we want to hold of on any future
                // draws until the animation is done.
                mWindowsAnimating = true;
            }
        } else if (mWindowsAnimating) {
            skipDraw = true;
        }

        mFirst = false;
        mWillDrawSoon = false;
        mNewSurfaceNeeded = false;
        mViewVisibility = viewVisibility;

        if (mAttachInfo.mHasWindowFocus) {
            final boolean imTarget = WindowManager.LayoutParams
                    .mayUseInputMethod(mWindowAttributes.flags);
            if (imTarget != mLastWasImTarget) {
                mLastWasImTarget = imTarget;
                InputMethodManager imm = InputMethodManager.peekInstance();
                if (imm != null && imTarget) {
                    imm.startGettingWindowFocus(mView);
                    imm.onWindowFocus(mView, mView.findFocus(),
                            mWindowAttributes.softInputMode,
                            !mHasHadWindowFocus, mWindowAttributes.flags);
                }
            }
        }

        // Remember if we must report the next draw.
        if ((relayoutResult & WindowManagerImpl.RELAYOUT_RES_FIRST_TIME) != 0) {
            mReportNextDraw = true;
        }

        boolean cancelDraw = attachInfo.mTreeObserver.dispatchOnPreDraw() ||
                viewVisibility != View.VISIBLE;

        if (!cancelDraw && !newSurface) {
            if (!skipDraw || mReportNextDraw) {
                if (mPendingTransitions != null && mPendingTransitions.size() > 0) {
                    for (int i = 0; i < mPendingTransitions.size(); ++i) {
                        mPendingTransitions.get(i).startChangingAnimations();
                    }
                    mPendingTransitions.clear();
                }

                performDraw();
            }
        } else {
            if (viewVisibility == View.VISIBLE) {
                // Try again
                scheduleTraversals();
            } else if (mPendingTransitions != null && mPendingTransitions.size() > 0) {
                for (int i = 0; i < mPendingTransitions.size(); ++i) {
                    mPendingTransitions.get(i).endChangingAnimations();
                }
                mPendingTransitions.clear();
            }
        }
    }

    private void performMeasure(int childWidthMeasureSpec, int childHeightMeasureSpec) {
        Trace.traceBegin(Trace.TRACE_TAG_VIEW, "measure");
        try {
            mView.measure(childWidthMeasureSpec, childHeightMeasureSpec);
        } finally {
            Trace.traceEnd(Trace.TRACE_TAG_VIEW);
        }
    }

    private void performLayout() {
        mLayoutRequested = false;
        mScrollMayChange = true;

        final View host = mView;
        if (DEBUG_ORIENTATION || DEBUG_LAYOUT) {
            Log.v(TAG, "Laying out " + host + " to (" +
                    host.getMeasuredWidth() + ", " + host.getMeasuredHeight() + ")");
        }

        Trace.traceBegin(Trace.TRACE_TAG_VIEW, "layout");
        try {
            host.layout(0, 0, host.getMeasuredWidth(), host.getMeasuredHeight());
        } finally {
            Trace.traceEnd(Trace.TRACE_TAG_VIEW);
        }
    }

    public void requestTransparentRegion(View child) {
        // the test below should not fail unless someone is messing with us
        checkThread();
        if (mView == child) {
            mView.mPrivateFlags |= View.REQUEST_TRANSPARENT_REGIONS;
            // Need to make sure we re-evaluate the window attributes next
            // time around, to ensure the window has the correct format.
            mWindowAttributesChanged = true;
            mWindowAttributesChangesFlag = 0;
            requestLayout();
        }
    }

    /**
     * Figures out the measure spec for the root view in a window based on it's
     * layout params.
     *
     * @param windowSize
     *            The available width or height of the window
     *
     * @param rootDimension
     *            The layout params for one dimension (width or height) of the
     *            window.
     *
     * @return The measure spec to use to measure the root view.
     */
    private static int getRootMeasureSpec(int windowSize, int rootDimension) {
        int measureSpec;
        switch (rootDimension) {

        case ViewGroup.LayoutParams.MATCH_PARENT:
            // Window can't resize. Force root view to be windowSize.
            measureSpec = MeasureSpec.makeMeasureSpec(windowSize, MeasureSpec.EXACTLY);
            break;
        case ViewGroup.LayoutParams.WRAP_CONTENT:
            // Window can resize. Set max size for root view.
            measureSpec = MeasureSpec.makeMeasureSpec(windowSize, MeasureSpec.AT_MOST);
            break;
        default:
            // Window wants to be an exact size. Force root view to be that size.
            measureSpec = MeasureSpec.makeMeasureSpec(rootDimension, MeasureSpec.EXACTLY);
            break;
        }
        return measureSpec;
    }

    int mHardwareYOffset;
    int mResizeAlpha;
    final Paint mResizePaint = new Paint();

    public void onHardwarePreDraw(HardwareCanvas canvas) {
        canvas.translate(0, -mHardwareYOffset);
    }

    public void onHardwarePostDraw(HardwareCanvas canvas) {
        if (mResizeBuffer != null) {
            mResizePaint.setAlpha(mResizeAlpha);
            canvas.drawHardwareLayer(mResizeBuffer, 0.0f, mHardwareYOffset, mResizePaint);
        }
        drawAccessibilityFocusedDrawableIfNeeded(canvas);
    }

    /**
     * @hide
     */
    void outputDisplayList(View view) {
        if (mAttachInfo != null && mAttachInfo.mHardwareCanvas != null) {
            DisplayList displayList = view.getDisplayList();
            if (displayList != null) {
                mAttachInfo.mHardwareCanvas.outputDisplayList(displayList);
            }
        }
    }

    /**
     * @see #PROPERTY_PROFILE_RENDERING
     */
    private void profileRendering(boolean enabled) {
        if (mProfileRendering) {
            mRenderProfilingEnabled = enabled;
            if (mRenderProfiler == null) {
                mRenderProfiler = new Thread(new Runnable() {
                    @Override
                    public void run() {
                        Log.d(TAG, "Starting profiling thread");
                        while (mRenderProfilingEnabled) {
                            mAttachInfo.mHandler.post(new Runnable() {
                                @Override
                                public void run() {
                                    mDirty.set(0, 0, mWidth, mHeight);
                                    scheduleTraversals();
                                }
                            });
                            try {
                                // TODO: This should use vsync when we get an API
                                Thread.sleep(15);
                            } catch (InterruptedException e) {
                                Log.d(TAG, "Exiting profiling thread");
                            }
                        }
                    }
                }, "Rendering Profiler");
                mRenderProfiler.start();
            } else {
                mRenderProfiler.interrupt();
                mRenderProfiler = null;
            }
        }
    }

    /**
     * Called from draw() when DEBUG_FPS is enabled
     */
    private void trackFPS() {
        // Tracks frames per second drawn. First value in a series of draws may be bogus
        // because it down not account for the intervening idle time
        long nowTime = System.currentTimeMillis();
        if (mFpsStartTime < 0) {
            mFpsStartTime = mFpsPrevTime = nowTime;
            mFpsNumFrames = 0;
        } else {
            ++mFpsNumFrames;
            String thisHash = Integer.toHexString(System.identityHashCode(this));
            long frameTime = nowTime - mFpsPrevTime;
            long totalTime = nowTime - mFpsStartTime;
            Log.v(TAG, "0x" + thisHash + "\tFrame time:\t" + frameTime);
            mFpsPrevTime = nowTime;
            if (totalTime > 1000) {
                float fps = (float) mFpsNumFrames * 1000 / totalTime;
                Log.v(TAG, "0x" + thisHash + "\tFPS:\t" + fps);
                mFpsStartTime = nowTime;
                mFpsNumFrames = 0;
            }
        }
    }

    private void performDraw() {
        if (!mAttachInfo.mScreenOn && !mReportNextDraw) {
            return;
        }

        final boolean fullRedrawNeeded = mFullRedrawNeeded;
        mFullRedrawNeeded = false;

        mIsDrawing = true;
        Trace.traceBegin(Trace.TRACE_TAG_VIEW, "draw");
        try {
            draw(fullRedrawNeeded);
        } finally {
            mIsDrawing = false;
            Trace.traceEnd(Trace.TRACE_TAG_VIEW);
        }

        if (mReportNextDraw) {
            mReportNextDraw = false;

            if (LOCAL_LOGV) {
                Log.v(TAG, "FINISHED DRAWING: " + mWindowAttributes.getTitle());
            }
            if (mSurfaceHolder != null && mSurface.isValid()) {
                mSurfaceHolderCallback.surfaceRedrawNeeded(mSurfaceHolder);
                SurfaceHolder.Callback callbacks[] = mSurfaceHolder.getCallbacks();
                if (callbacks != null) {
                    for (SurfaceHolder.Callback c : callbacks) {
                        if (c instanceof SurfaceHolder.Callback2) {
                            ((SurfaceHolder.Callback2)c).surfaceRedrawNeeded(
                                    mSurfaceHolder);
                        }
                    }
                }
            }
            try {
                sWindowSession.finishDrawing(mWindow);
            } catch (RemoteException e) {
            }
        }
    }

    private void draw(boolean fullRedrawNeeded) {
        Surface surface = mSurface;
        if (surface == null || !surface.isValid()) {
            return;
        }

        if (DEBUG_FPS) {
            trackFPS();
        }

        if (!sFirstDrawComplete) {
            synchronized (sFirstDrawHandlers) {
                sFirstDrawComplete = true;
                final int count = sFirstDrawHandlers.size();
                for (int i = 0; i< count; i++) {
                    mHandler.post(sFirstDrawHandlers.get(i));
                }
            }
        }

        scrollToRectOrFocus(null, false);

        final AttachInfo attachInfo = mAttachInfo;
        if (attachInfo.mViewScrollChanged) {
            attachInfo.mViewScrollChanged = false;
            attachInfo.mTreeObserver.dispatchOnScrollChanged();
        }

        int yoff;
        boolean animating = mScroller != null && mScroller.computeScrollOffset();
        if (animating) {
            yoff = mScroller.getCurrY();
        } else {
            yoff = mScrollY;
        }
        if (mCurScrollY != yoff) {
            mCurScrollY = yoff;
            fullRedrawNeeded = true;
        }

        final float appScale = attachInfo.mApplicationScale;
        final boolean scalingRequired = attachInfo.mScalingRequired;

        int resizeAlpha = 0;
        if (mResizeBuffer != null) {
            long deltaTime = SystemClock.uptimeMillis() - mResizeBufferStartTime;
            if (deltaTime < mResizeBufferDuration) {
                float amt = deltaTime/(float) mResizeBufferDuration;
                amt = mResizeInterpolator.getInterpolation(amt);
                animating = true;
                resizeAlpha = 255 - (int)(amt*255);
            } else {
                disposeResizeBuffer();
            }
        }

        final Rect dirty = mDirty;
        if (mSurfaceHolder != null) {
            // The app owns the surface, we won't draw.
            dirty.setEmpty();
            if (animating) {
                if (mScroller != null) {
                    mScroller.abortAnimation();
                }
                disposeResizeBuffer();
            }
            return;
        }

        if (fullRedrawNeeded) {
            attachInfo.mIgnoreDirtyState = true;
            dirty.set(0, 0, (int) (mWidth * appScale + 0.5f), (int) (mHeight * appScale + 0.5f));
        }

        if (DEBUG_ORIENTATION || DEBUG_DRAW) {
            Log.v(TAG, "Draw " + mView + "/"
                    + mWindowAttributes.getTitle()
                    + ": dirty={" + dirty.left + "," + dirty.top
                    + "," + dirty.right + "," + dirty.bottom + "} surface="
                    + surface + " surface.isValid()=" + surface.isValid() + ", appScale:" +
                    appScale + ", width=" + mWidth + ", height=" + mHeight);
        }

        attachInfo.mTreeObserver.dispatchOnDraw();

        if (!dirty.isEmpty() || mIsAnimating) {
            if (attachInfo.mHardwareRenderer != null && attachInfo.mHardwareRenderer.isEnabled()) {
                // Draw with hardware renderer.
                mIsAnimating = false;
                mHardwareYOffset = yoff;
                mResizeAlpha = resizeAlpha;

                mCurrentDirty.set(dirty);
                mCurrentDirty.union(mPreviousDirty);
                mPreviousDirty.set(dirty);
                dirty.setEmpty();

                if (attachInfo.mHardwareRenderer.draw(mView, attachInfo, this,
                        animating ? null : mCurrentDirty)) {
                    mPreviousDirty.set(0, 0, mWidth, mHeight);
                }
            } else if (!drawSoftware(surface, attachInfo, yoff, scalingRequired, dirty)) {
                return;
            }
        }

        if (animating) {
            mFullRedrawNeeded = true;
            scheduleTraversals();
        }
    }

    /**
     * @return true if drawing was succesfull, false if an error occurred
     */
    private boolean drawSoftware(Surface surface, AttachInfo attachInfo, int yoff,
            boolean scalingRequired, Rect dirty) {

        // If we get here with a disabled & requested hardware renderer, something went
        // wrong (an invalidate posted right before we destroyed the hardware surface
        // for instance) so we should just bail out. Locking the surface with software
        // rendering at this point would lock it forever and prevent hardware renderer
        // from doing its job when it comes back.
        if (attachInfo.mHardwareRenderer != null && !attachInfo.mHardwareRenderer.isEnabled() &&
                attachInfo.mHardwareRenderer.isRequested()) {
            mFullRedrawNeeded = true;
            scheduleTraversals();
            return false;
        }

        // Draw with software renderer.
        Canvas canvas;
        try {
            int left = dirty.left;
            int top = dirty.top;
            int right = dirty.right;
            int bottom = dirty.bottom;

            canvas = mSurface.lockCanvas(dirty);

            if (left != dirty.left || top != dirty.top || right != dirty.right ||
                    bottom != dirty.bottom) {
                attachInfo.mIgnoreDirtyState = true;
            }

            // TODO: Do this in native
            canvas.setDensity(mDensity);
        } catch (Surface.OutOfResourcesException e) {
            Log.e(TAG, "OutOfResourcesException locking surface", e);
            try {
                if (!sWindowSession.outOfMemory(mWindow)) {
                    Slog.w(TAG, "No processes killed for memory; killing self");
                    Process.killProcess(Process.myPid());
                }
            } catch (RemoteException ex) {
            }
            mLayoutRequested = true;    // ask wm for a new surface next time.
            return false;
        } catch (IllegalArgumentException e) {
            Log.e(TAG, "Could not lock surface", e);
            // Don't assume this is due to out of memory, it could be
            // something else, and if it is something else then we could
            // kill stuff (or ourself) for no reason.
            mLayoutRequested = true;    // ask wm for a new surface next time.
            return false;
        }

        try {
            if (DEBUG_ORIENTATION || DEBUG_DRAW) {
                Log.v(TAG, "Surface " + surface + " drawing to bitmap w="
                        + canvas.getWidth() + ", h=" + canvas.getHeight());
                //canvas.drawARGB(255, 255, 0, 0);
            }

            // If this bitmap's format includes an alpha channel, we
            // need to clear it before drawing so that the child will
            // properly re-composite its drawing on a transparent
            // background. This automatically respects the clip/dirty region
            // or
            // If we are applying an offset, we need to clear the area
            // where the offset doesn't appear to avoid having garbage
            // left in the blank areas.
            if (!canvas.isOpaque() || yoff != 0) {
                canvas.drawColor(0, PorterDuff.Mode.CLEAR);
            }

            dirty.setEmpty();
            mIsAnimating = false;
            attachInfo.mDrawingTime = SystemClock.uptimeMillis();
            mView.mPrivateFlags |= View.DRAWN;

            if (DEBUG_DRAW) {
                Context cxt = mView.getContext();
                Log.i(TAG, "Drawing: package:" + cxt.getPackageName() +
                        ", metrics=" + cxt.getResources().getDisplayMetrics() +
                        ", compatibilityInfo=" + cxt.getResources().getCompatibilityInfo());
            }
            try {
                canvas.translate(0, -yoff);
                if (mTranslator != null) {
                    mTranslator.translateCanvas(canvas);
                }
                canvas.setScreenDensity(scalingRequired
                        ? DisplayMetrics.DENSITY_DEVICE : 0);
                attachInfo.mSetIgnoreDirtyState = false;

                mView.draw(canvas);

                drawAccessibilityFocusedDrawableIfNeeded(canvas);
            } finally {
                if (!attachInfo.mSetIgnoreDirtyState) {
                    // Only clear the flag if it was not set during the mView.draw() call
                    attachInfo.mIgnoreDirtyState = false;
                }
            }
        } finally {
            try {
                surface.unlockCanvasAndPost(canvas);
            } catch (IllegalArgumentException e) {
                Log.e(TAG, "Could not unlock surface", e);
                mLayoutRequested = true;    // ask wm for a new surface next time.
                //noinspection ReturnInsideFinallyBlock
                return false;
            }

            if (LOCAL_LOGV) {
                Log.v(TAG, "Surface " + surface + " unlockCanvasAndPost");
            }
        }
        return true;
    }

    @Override
    public View findViewToTakeAccessibilityFocusFromHover(View child, View descendant) {
        if (descendant.includeForAccessibility()) {
            return descendant;
        }
        return null;
    }

    /**
     * We want to draw a highlight around the current accessibility focused.
     * Since adding a style for all possible view is not a viable option we
     * have this specialized drawing method.
     *
     * Note: We are doing this here to be able to draw the highlight for
     *       virtual views in addition to real ones.
     *
     * @param canvas The canvas on which to draw.
     */
    private void drawAccessibilityFocusedDrawableIfNeeded(Canvas canvas) {
        AccessibilityManager manager = AccessibilityManager.getInstance(mView.mContext);
        if (!manager.isEnabled() || !manager.isTouchExplorationEnabled()) {
            return;
        }
        if (mAccessibilityFocusedHost == null || mAccessibilityFocusedHost.mAttachInfo == null) {
            return;
        }
        Drawable drawable = getAccessibilityFocusedDrawable();
        if (drawable == null) {
            return;
        }
        AccessibilityNodeProvider provider =
            mAccessibilityFocusedHost.getAccessibilityNodeProvider();
        Rect bounds = mView.mAttachInfo.mTmpInvalRect;
        if (provider == null) {
            mAccessibilityFocusedHost.getDrawingRect(bounds);
            if (mView instanceof ViewGroup) {
                ViewGroup viewGroup = (ViewGroup) mView;
                viewGroup.offsetDescendantRectToMyCoords(mAccessibilityFocusedHost, bounds);
            }
        } else {
            if (mAccessibilityFocusedVirtualView == null) {
                return;
            }
            mAccessibilityFocusedVirtualView.getBoundsInScreen(bounds);
            bounds.offset(-mAttachInfo.mWindowLeft, -mAttachInfo.mWindowTop);
        }
        drawable.setBounds(bounds);
        drawable.draw(canvas);
    }

    private Drawable getAccessibilityFocusedDrawable() {
        if (mAttachInfo != null) {
            // Lazily load the accessibility focus drawable.
            if (mAttachInfo.mAccessibilityFocusDrawable == null) {
                TypedValue value = new TypedValue();
                final boolean resolved = mView.mContext.getTheme().resolveAttribute(
                        R.attr.accessibilityFocusedDrawable, value, true);
                if (resolved) {
                    mAttachInfo.mAccessibilityFocusDrawable =
                        mView.mContext.getResources().getDrawable(value.resourceId);
                }
            }
            return mAttachInfo.mAccessibilityFocusDrawable;
        }
        return null;
    }

    void invalidateDisplayLists() {
        final ArrayList<DisplayList> displayLists = mDisplayLists;
        final int count = displayLists.size();

        for (int i = 0; i < count; i++) {
            final DisplayList displayList = displayLists.get(i);
            displayList.invalidate();
            displayList.clear();
        }

        displayLists.clear();
    }

    boolean scrollToRectOrFocus(Rect rectangle, boolean immediate) {
        final View.AttachInfo attachInfo = mAttachInfo;
        final Rect ci = attachInfo.mContentInsets;
        final Rect vi = attachInfo.mVisibleInsets;
        int scrollY = 0;
        boolean handled = false;

        if (vi.left > ci.left || vi.top > ci.top
                || vi.right > ci.right || vi.bottom > ci.bottom) {
            // We'll assume that we aren't going to change the scroll
            // offset, since we want to avoid that unless it is actually
            // going to make the focus visible...  otherwise we scroll
            // all over the place.
            scrollY = mScrollY;
            // We can be called for two different situations: during a draw,
            // to update the scroll position if the focus has changed (in which
            // case 'rectangle' is null), or in response to a
            // requestChildRectangleOnScreen() call (in which case 'rectangle'
            // is non-null and we just want to scroll to whatever that
            // rectangle is).
            View focus = mRealFocusedView;

            // When in touch mode, focus points to the previously focused view,
            // which may have been removed from the view hierarchy. The following
            // line checks whether the view is still in our hierarchy.
            if (focus == null || focus.mAttachInfo != mAttachInfo) {
                mRealFocusedView = null;
                return false;
            }

            if (focus != mLastScrolledFocus) {
                // If the focus has changed, then ignore any requests to scroll
                // to a rectangle; first we want to make sure the entire focus
                // view is visible.
                rectangle = null;
            }
            if (DEBUG_INPUT_RESIZE) Log.v(TAG, "Eval scroll: focus=" + focus
                    + " rectangle=" + rectangle + " ci=" + ci
                    + " vi=" + vi);
            if (focus == mLastScrolledFocus && !mScrollMayChange
                    && rectangle == null) {
                // Optimization: if the focus hasn't changed since last
                // time, and no layout has happened, then just leave things
                // as they are.
                if (DEBUG_INPUT_RESIZE) Log.v(TAG, "Keeping scroll y="
                        + mScrollY + " vi=" + vi.toShortString());
            } else if (focus != null) {
                // We need to determine if the currently focused view is
                // within the visible part of the window and, if not, apply
                // a pan so it can be seen.
                mLastScrolledFocus = focus;
                mScrollMayChange = false;
                if (DEBUG_INPUT_RESIZE) Log.v(TAG, "Need to scroll?");
                // Try to find the rectangle from the focus view.
                if (focus.getGlobalVisibleRect(mVisRect, null)) {
                    if (DEBUG_INPUT_RESIZE) Log.v(TAG, "Root w="
                            + mView.getWidth() + " h=" + mView.getHeight()
                            + " ci=" + ci.toShortString()
                            + " vi=" + vi.toShortString());
                    if (rectangle == null) {
                        focus.getFocusedRect(mTempRect);
                        if (DEBUG_INPUT_RESIZE) Log.v(TAG, "Focus " + focus
                                + ": focusRect=" + mTempRect.toShortString());
                        if (mView instanceof ViewGroup) {
                            ((ViewGroup) mView).offsetDescendantRectToMyCoords(
                                    focus, mTempRect);
                        }
                        if (DEBUG_INPUT_RESIZE) Log.v(TAG,
                                "Focus in window: focusRect="
                                + mTempRect.toShortString()
                                + " visRect=" + mVisRect.toShortString());
                    } else {
                        mTempRect.set(rectangle);
                        if (DEBUG_INPUT_RESIZE) Log.v(TAG,
                                "Request scroll to rect: "
                                + mTempRect.toShortString()
                                + " visRect=" + mVisRect.toShortString());
                    }
                    if (mTempRect.intersect(mVisRect)) {
                        if (DEBUG_INPUT_RESIZE) Log.v(TAG,
                                "Focus window visible rect: "
                                + mTempRect.toShortString());
                        if (mTempRect.height() >
                                (mView.getHeight()-vi.top-vi.bottom)) {
                            // If the focus simply is not going to fit, then
                            // best is probably just to leave things as-is.
                            if (DEBUG_INPUT_RESIZE) Log.v(TAG,
                                    "Too tall; leaving scrollY=" + scrollY);
                        } else if ((mTempRect.top-scrollY) < vi.top) {
                            scrollY -= vi.top - (mTempRect.top-scrollY);
                            if (DEBUG_INPUT_RESIZE) Log.v(TAG,
                                    "Top covered; scrollY=" + scrollY);
                        } else if ((mTempRect.bottom-scrollY)
                                > (mView.getHeight()-vi.bottom)) {
                            scrollY += (mTempRect.bottom-scrollY)
                                    - (mView.getHeight()-vi.bottom);
                            if (DEBUG_INPUT_RESIZE) Log.v(TAG,
                                    "Bottom covered; scrollY=" + scrollY);
                        }
                        handled = true;
                    }
                }
            }
        }

        if (scrollY != mScrollY) {
            if (DEBUG_INPUT_RESIZE) Log.v(TAG, "Pan scroll changed: old="
                    + mScrollY + " , new=" + scrollY);
            if (!immediate && mResizeBuffer == null) {
                if (mScroller == null) {
                    mScroller = new Scroller(mView.getContext());
                }
                mScroller.startScroll(0, mScrollY, 0, scrollY-mScrollY);
            } else if (mScroller != null) {
                mScroller.abortAnimation();
            }
            mScrollY = scrollY;
        }

        return handled;
    }

    /**
     * @hide
     */
    public View getAccessibilityFocusedHost() {
        return mAccessibilityFocusedHost;
    }

    /**
     * @hide
     */
    public AccessibilityNodeInfo getAccessibilityFocusedVirtualView() {
        return mAccessibilityFocusedVirtualView;
    }

    void setAccessibilityFocus(View view, AccessibilityNodeInfo node) {
        // If we have a virtual view with accessibility focus we need
        // to clear the focus and invalidate the virtual view bounds.
        if (mAccessibilityFocusedVirtualView != null) {

            AccessibilityNodeInfo focusNode = mAccessibilityFocusedVirtualView;
            View focusHost = mAccessibilityFocusedHost;
            focusHost.clearAccessibilityFocusNoCallbacks();

            // Wipe the state of the current accessibility focus since
            // the call into the provider to clear accessibility focus
            // will fire an accessibility event which will end up calling
            // this method and we want to have clean state when this
            // invocation happens.
            mAccessibilityFocusedHost = null;
            mAccessibilityFocusedVirtualView = null;

            AccessibilityNodeProvider provider = focusHost.getAccessibilityNodeProvider();
            if (provider != null) {
                // Invalidate the area of the cleared accessibility focus.
                focusNode.getBoundsInParent(mTempRect);
                focusHost.invalidate(mTempRect);
                // Clear accessibility focus in the virtual node.
                final int virtualNodeId = AccessibilityNodeInfo.getVirtualDescendantId(
                        focusNode.getSourceNodeId());
                provider.performAction(virtualNodeId,
                        AccessibilityNodeInfo.ACTION_CLEAR_ACCESSIBILITY_FOCUS, null);
            }
            focusNode.recycle();
        }
        if (mAccessibilityFocusedHost != null) {
            // Clear accessibility focus in the view.
            mAccessibilityFocusedHost.clearAccessibilityFocusNoCallbacks();
        }

        // Set the new focus host and node.
        mAccessibilityFocusedHost = view;
        mAccessibilityFocusedVirtualView = node;
    }

    public void requestChildFocus(View child, View focused) {
        checkThread();

        if (DEBUG_INPUT_RESIZE) {
            Log.v(TAG, "Request child focus: focus now " + focused);
        }

        mAttachInfo.mTreeObserver.dispatchOnGlobalFocusChange(mOldFocusedView, focused);
        scheduleTraversals();

        mFocusedView = mRealFocusedView = focused;
    }

    public void clearChildFocus(View child) {
        checkThread();

        if (DEBUG_INPUT_RESIZE) {
            Log.v(TAG, "Clearing child focus");
        }

        mOldFocusedView = mFocusedView;

        // Invoke the listener only if there is no view to take focus
        if (focusSearch(null, View.FOCUS_FORWARD) == null) {
            mAttachInfo.mTreeObserver.dispatchOnGlobalFocusChange(mOldFocusedView, null);
        }

        mFocusedView = mRealFocusedView = null;
    }

    @Override
    public ViewParent getParentForAccessibility() {
        return null;
    }

    public void focusableViewAvailable(View v) {
        checkThread();
        if (mView != null) {
            if (!mView.hasFocus()) {
                v.requestFocus();
            } else {
                // the one case where will transfer focus away from the current one
                // is if the current view is a view group that prefers to give focus
                // to its children first AND the view is a descendant of it.
                mFocusedView = mView.findFocus();
                boolean descendantsHaveDibsOnFocus =
                        (mFocusedView instanceof ViewGroup) &&
                            (((ViewGroup) mFocusedView).getDescendantFocusability() ==
                                    ViewGroup.FOCUS_AFTER_DESCENDANTS);
                if (descendantsHaveDibsOnFocus && isViewDescendantOf(v, mFocusedView)) {
                    // If a view gets the focus, the listener will be invoked from requestChildFocus()
                    v.requestFocus();
                }
            }
        }
    }

    public void recomputeViewAttributes(View child) {
        checkThread();
        if (mView == child) {
            mAttachInfo.mRecomputeGlobalAttributes = true;
            if (!mWillDrawSoon) {
                scheduleTraversals();
            }
        }
    }

    void dispatchDetachedFromWindow() {
        if (mView != null && mView.mAttachInfo != null) {
            if (mAttachInfo.mHardwareRenderer != null &&
                    mAttachInfo.mHardwareRenderer.isEnabled()) {
                mAttachInfo.mHardwareRenderer.validate();
            }
            mView.dispatchDetachedFromWindow();
        }

        mAccessibilityInteractionConnectionManager.ensureNoConnection();
        mAccessibilityManager.removeAccessibilityStateChangeListener(
                mAccessibilityInteractionConnectionManager);
        removeSendWindowContentChangedCallback();

        destroyHardwareRenderer();

        setAccessibilityFocus(null, null);

        mView = null;
        mAttachInfo.mRootView = null;
        mAttachInfo.mSurface = null;

        mSurface.release();

        if (mInputQueueCallback != null && mInputQueue != null) {
            mInputQueueCallback.onInputQueueDestroyed(mInputQueue);
            mInputQueueCallback = null;
            mInputQueue = null;
        } else if (mInputEventReceiver != null) {
            mInputEventReceiver.dispose();
            mInputEventReceiver = null;
        }
        try {
            sWindowSession.remove(mWindow);
        } catch (RemoteException e) {
        }

        // Dispose the input channel after removing the window so the Window Manager
        // doesn't interpret the input channel being closed as an abnormal termination.
        if (mInputChannel != null) {
            mInputChannel.dispose();
            mInputChannel = null;
        }

        unscheduleTraversals();
    }

    void updateConfiguration(Configuration config, boolean force) {
        if (DEBUG_CONFIGURATION) Log.v(TAG,
                "Applying new config to window "
                + mWindowAttributes.getTitle()
                + ": " + config);

        CompatibilityInfo ci = mCompatibilityInfo.getIfNeeded();
        if (ci != null) {
            config = new Configuration(config);
            ci.applyToConfiguration(config);
        }

        synchronized (sConfigCallbacks) {
            for (int i=sConfigCallbacks.size()-1; i>=0; i--) {
                sConfigCallbacks.get(i).onConfigurationChanged(config);
            }
        }
        if (mView != null) {
            // At this point the resources have been updated to
            // have the most recent config, whatever that is.  Use
            // the on in them which may be newer.
            config = mView.getResources().getConfiguration();
            if (force || mLastConfiguration.diff(config) != 0) {
                mLastConfiguration.setTo(config);
                mView.dispatchConfigurationChanged(config);
            }
        }
    }

    /**
     * Return true if child is an ancestor of parent, (or equal to the parent).
     */
    public static boolean isViewDescendantOf(View child, View parent) {
        if (child == parent) {
            return true;
        }

        final ViewParent theParent = child.getParent();
        return (theParent instanceof ViewGroup) && isViewDescendantOf((View) theParent, parent);
    }

    private static void forceLayout(View view) {
        view.forceLayout();
        if (view instanceof ViewGroup) {
            ViewGroup group = (ViewGroup) view;
            final int count = group.getChildCount();
            for (int i = 0; i < count; i++) {
                forceLayout(group.getChildAt(i));
            }
        }
    }

    private final static int MSG_INVALIDATE = 1;
    private final static int MSG_INVALIDATE_RECT = 2;
    private final static int MSG_DIE = 3;
    private final static int MSG_RESIZED = 4;
    private final static int MSG_RESIZED_REPORT = 5;
    private final static int MSG_WINDOW_FOCUS_CHANGED = 6;
    private final static int MSG_DISPATCH_KEY = 7;
    private final static int MSG_DISPATCH_APP_VISIBILITY = 8;
    private final static int MSG_DISPATCH_GET_NEW_SURFACE = 9;
    private final static int MSG_IME_FINISHED_EVENT = 10;
    private final static int MSG_DISPATCH_KEY_FROM_IME = 11;
    private final static int MSG_FINISH_INPUT_CONNECTION = 12;
    private final static int MSG_CHECK_FOCUS = 13;
    private final static int MSG_CLOSE_SYSTEM_DIALOGS = 14;
    private final static int MSG_DISPATCH_DRAG_EVENT = 15;
    private final static int MSG_DISPATCH_DRAG_LOCATION_EVENT = 16;
    private final static int MSG_DISPATCH_SYSTEM_UI_VISIBILITY = 17;
    private final static int MSG_UPDATE_CONFIGURATION = 18;
    private final static int MSG_PROCESS_INPUT_EVENTS = 19;
    private final static int MSG_DISPATCH_SCREEN_STATE = 20;
    private final static int MSG_INVALIDATE_DISPLAY_LIST = 21;
    private final static int MSG_CLEAR_ACCESSIBILITY_FOCUS_HOST = 22;
    private final static int MSG_DISPATCH_DONE_ANIMATING = 23;
    private final static int MSG_INVALIDATE_WORLD = 24;

    final class ViewRootHandler extends Handler {
        @Override
        public String getMessageName(Message message) {
            switch (message.what) {
                case MSG_INVALIDATE:
                    return "MSG_INVALIDATE";
                case MSG_INVALIDATE_RECT:
                    return "MSG_INVALIDATE_RECT";
                case MSG_DIE:
                    return "MSG_DIE";
                case MSG_RESIZED:
                    return "MSG_RESIZED";
                case MSG_RESIZED_REPORT:
                    return "MSG_RESIZED_REPORT";
                case MSG_WINDOW_FOCUS_CHANGED:
                    return "MSG_WINDOW_FOCUS_CHANGED";
                case MSG_DISPATCH_KEY:
                    return "MSG_DISPATCH_KEY";
                case MSG_DISPATCH_APP_VISIBILITY:
                    return "MSG_DISPATCH_APP_VISIBILITY";
                case MSG_DISPATCH_GET_NEW_SURFACE:
                    return "MSG_DISPATCH_GET_NEW_SURFACE";
                case MSG_IME_FINISHED_EVENT:
                    return "MSG_IME_FINISHED_EVENT";
                case MSG_DISPATCH_KEY_FROM_IME:
                    return "MSG_DISPATCH_KEY_FROM_IME";
                case MSG_FINISH_INPUT_CONNECTION:
                    return "MSG_FINISH_INPUT_CONNECTION";
                case MSG_CHECK_FOCUS:
                    return "MSG_CHECK_FOCUS";
                case MSG_CLOSE_SYSTEM_DIALOGS:
                    return "MSG_CLOSE_SYSTEM_DIALOGS";
                case MSG_DISPATCH_DRAG_EVENT:
                    return "MSG_DISPATCH_DRAG_EVENT";
                case MSG_DISPATCH_DRAG_LOCATION_EVENT:
                    return "MSG_DISPATCH_DRAG_LOCATION_EVENT";
                case MSG_DISPATCH_SYSTEM_UI_VISIBILITY:
                    return "MSG_DISPATCH_SYSTEM_UI_VISIBILITY";
                case MSG_UPDATE_CONFIGURATION:
                    return "MSG_UPDATE_CONFIGURATION";
                case MSG_PROCESS_INPUT_EVENTS:
                    return "MSG_PROCESS_INPUT_EVENTS";
                case MSG_DISPATCH_SCREEN_STATE:
                    return "MSG_DISPATCH_SCREEN_STATE";
                case MSG_INVALIDATE_DISPLAY_LIST:
                    return "MSG_INVALIDATE_DISPLAY_LIST";
                case MSG_CLEAR_ACCESSIBILITY_FOCUS_HOST:
                    return "MSG_CLEAR_ACCESSIBILITY_FOCUS_HOST";
                case MSG_DISPATCH_DONE_ANIMATING:
                    return "MSG_DISPATCH_DONE_ANIMATING";
            }
            return super.getMessageName(message);
        }

        @Override
        public void handleMessage(Message msg) {
            switch (msg.what) {
            case MSG_INVALIDATE:
                ((View) msg.obj).invalidate();
                break;
            case MSG_INVALIDATE_RECT:
                final View.AttachInfo.InvalidateInfo info = (View.AttachInfo.InvalidateInfo) msg.obj;
                info.target.invalidate(info.left, info.top, info.right, info.bottom);
                info.release();
                break;
            case MSG_IME_FINISHED_EVENT:
                handleImeFinishedEvent(msg.arg1, msg.arg2 != 0);
                break;
            case MSG_PROCESS_INPUT_EVENTS:
                mProcessInputEventsScheduled = false;
                doProcessInputEvents();
                break;
            case MSG_DISPATCH_APP_VISIBILITY:
                handleAppVisibility(msg.arg1 != 0);
                break;
            case MSG_DISPATCH_GET_NEW_SURFACE:
                handleGetNewSurface();
                break;
            case MSG_RESIZED:
                ResizedInfo ri = (ResizedInfo)msg.obj;

                if (mWinFrame.width() == msg.arg1 && mWinFrame.height() == msg.arg2
                        && mPendingContentInsets.equals(ri.contentInsets)
                        && mPendingVisibleInsets.equals(ri.visibleInsets)
                        && ((ResizedInfo)msg.obj).newConfig == null) {
                    break;
                }
                // fall through...
            case MSG_RESIZED_REPORT:
                if (mAdded) {
                    Configuration config = ((ResizedInfo)msg.obj).newConfig;
                    if (config != null) {
                        updateConfiguration(config, false);
                    }
                    mWinFrame.left = 0;
                    mWinFrame.right = msg.arg1;
                    mWinFrame.top = 0;
                    mWinFrame.bottom = msg.arg2;
                    mPendingContentInsets.set(((ResizedInfo)msg.obj).contentInsets);
                    mPendingVisibleInsets.set(((ResizedInfo)msg.obj).visibleInsets);
                    if (msg.what == MSG_RESIZED_REPORT) {
                        mReportNextDraw = true;
                    }

                    if (mView != null) {
                        forceLayout(mView);
                    }
                    requestLayout();
                }
                break;
            case MSG_WINDOW_FOCUS_CHANGED: {
                if (mAdded) {
                    boolean hasWindowFocus = msg.arg1 != 0;
                    mAttachInfo.mHasWindowFocus = hasWindowFocus;

                    profileRendering(hasWindowFocus);

                    if (hasWindowFocus) {
                        boolean inTouchMode = msg.arg2 != 0;
                        ensureTouchModeLocally(inTouchMode);

                        if (mAttachInfo.mHardwareRenderer != null &&
                                mSurface != null && mSurface.isValid()) {
                            mFullRedrawNeeded = true;
                            try {
                                mAttachInfo.mHardwareRenderer.initializeIfNeeded(mWidth, mHeight,
                                        mHolder);
                            } catch (Surface.OutOfResourcesException e) {
                                Log.e(TAG, "OutOfResourcesException locking surface", e);
                                try {
                                    if (!sWindowSession.outOfMemory(mWindow)) {
                                        Slog.w(TAG, "No processes killed for memory; killing self");
                                        Process.killProcess(Process.myPid());
                                    }
                                } catch (RemoteException ex) {
                                }
                                // Retry in a bit.
                                sendMessageDelayed(obtainMessage(msg.what, msg.arg1, msg.arg2), 500);
                                return;
                            }
                        }
                    }

                    mLastWasImTarget = WindowManager.LayoutParams
                            .mayUseInputMethod(mWindowAttributes.flags);

                    InputMethodManager imm = InputMethodManager.peekInstance();
                    if (mView != null) {
                        if (hasWindowFocus && imm != null && mLastWasImTarget) {
                            imm.startGettingWindowFocus(mView);
                        }
                        mAttachInfo.mKeyDispatchState.reset();
                        mView.dispatchWindowFocusChanged(hasWindowFocus);
                    }

                    // Note: must be done after the focus change callbacks,
                    // so all of the view state is set up correctly.
                    if (hasWindowFocus) {
                        if (imm != null && mLastWasImTarget) {
                            imm.onWindowFocus(mView, mView.findFocus(),
                                    mWindowAttributes.softInputMode,
                                    !mHasHadWindowFocus, mWindowAttributes.flags);
                        }
                        // Clear the forward bit.  We can just do this directly, since
                        // the window manager doesn't care about it.
                        mWindowAttributes.softInputMode &=
                                ~WindowManager.LayoutParams.SOFT_INPUT_IS_FORWARD_NAVIGATION;
                        ((WindowManager.LayoutParams)mView.getLayoutParams())
                                .softInputMode &=
                                    ~WindowManager.LayoutParams.SOFT_INPUT_IS_FORWARD_NAVIGATION;
                        mHasHadWindowFocus = true;
                    }

                    setAccessibilityFocus(null, null);

                    if (mView != null && mAccessibilityManager.isEnabled()) {
                        if (hasWindowFocus) {
                            mView.sendAccessibilityEvent(
                                    AccessibilityEvent.TYPE_WINDOW_STATE_CHANGED);
                        }
                    }
                }
            } break;
            case MSG_DIE:
                doDie();
                break;
            case MSG_DISPATCH_KEY: {
                KeyEvent event = (KeyEvent)msg.obj;
                enqueueInputEvent(event, null, 0, true);
            } break;
            case MSG_DISPATCH_KEY_FROM_IME: {
                if (LOCAL_LOGV) Log.v(
                    TAG, "Dispatching key "
                    + msg.obj + " from IME to " + mView);
                KeyEvent event = (KeyEvent)msg.obj;
                if ((event.getFlags()&KeyEvent.FLAG_FROM_SYSTEM) != 0) {
                    // The IME is trying to say this event is from the
                    // system!  Bad bad bad!
                    //noinspection UnusedAssignment
                    event = KeyEvent.changeFlags(event, event.getFlags() & ~KeyEvent.FLAG_FROM_SYSTEM);
                }
                enqueueInputEvent(event, null, QueuedInputEvent.FLAG_DELIVER_POST_IME, true);
            } break;
            case MSG_FINISH_INPUT_CONNECTION: {
                InputMethodManager imm = InputMethodManager.peekInstance();
                if (imm != null) {
                    imm.reportFinishInputConnection((InputConnection)msg.obj);
                }
            } break;
            case MSG_CHECK_FOCUS: {
                InputMethodManager imm = InputMethodManager.peekInstance();
                if (imm != null) {
                    imm.checkFocus();
                }
            } break;
            case MSG_CLOSE_SYSTEM_DIALOGS: {
                if (mView != null) {
                    mView.onCloseSystemDialogs((String)msg.obj);
                }
            } break;
            case MSG_DISPATCH_DRAG_EVENT:
            case MSG_DISPATCH_DRAG_LOCATION_EVENT: {
                DragEvent event = (DragEvent)msg.obj;
                event.mLocalState = mLocalDragState;    // only present when this app called startDrag()
                handleDragEvent(event);
            } break;
            case MSG_DISPATCH_SYSTEM_UI_VISIBILITY: {
                handleDispatchSystemUiVisibilityChanged((SystemUiVisibilityInfo)msg.obj);
            } break;
            case MSG_UPDATE_CONFIGURATION: {
                Configuration config = (Configuration)msg.obj;
                if (config.isOtherSeqNewer(mLastConfiguration)) {
                    config = mLastConfiguration;
                }
                updateConfiguration(config, false);
            } break;
            case MSG_DISPATCH_SCREEN_STATE: {
                if (mView != null) {
                    handleScreenStateChange(msg.arg1 == 1);
                }
            } break;
            case MSG_INVALIDATE_DISPLAY_LIST: {
                invalidateDisplayLists();
            } break;
            case MSG_CLEAR_ACCESSIBILITY_FOCUS_HOST: {
                setAccessibilityFocus(null, null);
            } break;
            case MSG_DISPATCH_DONE_ANIMATING: {
                handleDispatchDoneAnimating();
            } break;
            case MSG_INVALIDATE_WORLD: {
                invalidateWorld(mView);
            } break;
            }
        }
    }

    final ViewRootHandler mHandler = new ViewRootHandler();

    /**
     * Something in the current window tells us we need to change the touch mode.  For
     * example, we are not in touch mode, and the user touches the screen.
     *
     * If the touch mode has changed, tell the window manager, and handle it locally.
     *
     * @param inTouchMode Whether we want to be in touch mode.
     * @return True if the touch mode changed and focus changed was changed as a result
     */
    boolean ensureTouchMode(boolean inTouchMode) {
        if (DBG) Log.d("touchmode", "ensureTouchMode(" + inTouchMode + "), current "
                + "touch mode is " + mAttachInfo.mInTouchMode);
        if (mAttachInfo.mInTouchMode == inTouchMode) return false;

        // tell the window manager
        try {
            sWindowSession.setInTouchMode(inTouchMode);
        } catch (RemoteException e) {
            throw new RuntimeException(e);
        }

        // handle the change
        return ensureTouchModeLocally(inTouchMode);
    }

    /**
     * Ensure that the touch mode for this window is set, and if it is changing,
     * take the appropriate action.
     * @param inTouchMode Whether we want to be in touch mode.
     * @return True if the touch mode changed and focus changed was changed as a result
     */
    private boolean ensureTouchModeLocally(boolean inTouchMode) {
        if (DBG) Log.d("touchmode", "ensureTouchModeLocally(" + inTouchMode + "), current "
                + "touch mode is " + mAttachInfo.mInTouchMode);

        if (mAttachInfo.mInTouchMode == inTouchMode) return false;

        mAttachInfo.mInTouchMode = inTouchMode;
        mAttachInfo.mTreeObserver.dispatchOnTouchModeChanged(inTouchMode);

        return (inTouchMode) ? enterTouchMode() : leaveTouchMode();
    }

    private boolean enterTouchMode() {
        if (mView != null) {
            if (mView.hasFocus()) {
                // note: not relying on mFocusedView here because this could
                // be when the window is first being added, and mFocused isn't
                // set yet.
                final View focused = mView.findFocus();
                if (focused != null && !focused.isFocusableInTouchMode()) {

                    final ViewGroup ancestorToTakeFocus =
                            findAncestorToTakeFocusInTouchMode(focused);
                    if (ancestorToTakeFocus != null) {
                        // there is an ancestor that wants focus after its descendants that
                        // is focusable in touch mode.. give it focus
                        return ancestorToTakeFocus.requestFocus();
                    } else {
                        // nothing appropriate to have focus in touch mode, clear it out
                        mView.unFocus();
                        mAttachInfo.mTreeObserver.dispatchOnGlobalFocusChange(focused, null);
                        mFocusedView = null;
                        mOldFocusedView = null;
                        return true;
                    }
                }
            }
        }
        return false;
    }

    /**
     * Find an ancestor of focused that wants focus after its descendants and is
     * focusable in touch mode.
     * @param focused The currently focused view.
     * @return An appropriate view, or null if no such view exists.
     */
    private static ViewGroup findAncestorToTakeFocusInTouchMode(View focused) {
        ViewParent parent = focused.getParent();
        while (parent instanceof ViewGroup) {
            final ViewGroup vgParent = (ViewGroup) parent;
            if (vgParent.getDescendantFocusability() == ViewGroup.FOCUS_AFTER_DESCENDANTS
                    && vgParent.isFocusableInTouchMode()) {
                return vgParent;
            }
            if (vgParent.isRootNamespace()) {
                return null;
            } else {
                parent = vgParent.getParent();
            }
        }
        return null;
    }

    private boolean leaveTouchMode() {
        if (mView != null) {
            if (mView.hasFocus()) {
                // i learned the hard way to not trust mFocusedView :)
                mFocusedView = mView.findFocus();
                if (!(mFocusedView instanceof ViewGroup)) {
                    // some view has focus, let it keep it
                    return false;
                } else if (((ViewGroup)mFocusedView).getDescendantFocusability() !=
                        ViewGroup.FOCUS_AFTER_DESCENDANTS) {
                    // some view group has focus, and doesn't prefer its children
                    // over itself for focus, so let them keep it.
                    return false;
                }
            }

            // find the best view to give focus to in this brave new non-touch-mode
            // world
            final View focused = focusSearch(null, View.FOCUS_DOWN);
            if (focused != null) {
                return focused.requestFocus(View.FOCUS_DOWN);
            }
        }
        return false;
    }

    private void deliverInputEvent(QueuedInputEvent q) {
        Trace.traceBegin(Trace.TRACE_TAG_VIEW, "deliverInputEvent");
        try {
            if (q.mEvent instanceof KeyEvent) {
                deliverKeyEvent(q);
            } else {
                final int source = q.mEvent.getSource();
                if ((source & InputDevice.SOURCE_CLASS_POINTER) != 0) {
                    deliverPointerEvent(q);
                } else if ((source & InputDevice.SOURCE_CLASS_TRACKBALL) != 0) {
                    deliverTrackballEvent(q);
                } else {
                    deliverGenericMotionEvent(q);
                }
            }
        } finally {
            Trace.traceEnd(Trace.TRACE_TAG_VIEW);
        }
    }

    private void deliverPointerEvent(QueuedInputEvent q) {
        final MotionEvent event = (MotionEvent)q.mEvent;
        final boolean isTouchEvent = event.isTouchEvent();
        if (mInputEventConsistencyVerifier != null) {
            if (isTouchEvent) {
                mInputEventConsistencyVerifier.onTouchEvent(event, 0);
            } else {
                mInputEventConsistencyVerifier.onGenericMotionEvent(event, 0);
            }
        }

        // If there is no view, then the event will not be handled.
        if (mView == null || !mAdded) {
            finishInputEvent(q, false);
            return;
        }

        // Translate the pointer event for compatibility, if needed.
        if (mTranslator != null) {
            mTranslator.translateEventInScreenToAppWindow(event);
        }

        // Enter touch mode on down or scroll.
        final int action = event.getAction();
        if (action == MotionEvent.ACTION_DOWN || action == MotionEvent.ACTION_SCROLL) {
            ensureTouchMode(true);
        }

        // Offset the scroll position.
        if (mCurScrollY != 0) {
            event.offsetLocation(0, mCurScrollY);
        }
        if (MEASURE_LATENCY) {
            lt.sample("A Dispatching PointerEvents", System.nanoTime() - event.getEventTimeNano());
        }

        // Remember the touch position for possible drag-initiation.
        if (isTouchEvent) {
            mLastTouchPoint.x = event.getRawX();
            mLastTouchPoint.y = event.getRawY();
        }

        // Dispatch touch to view hierarchy.
        boolean handled = mView.dispatchPointerEvent(event);
        if (MEASURE_LATENCY) {
            lt.sample("B Dispatched PointerEvents ", System.nanoTime() - event.getEventTimeNano());
        }
        if (handled) {
            finishInputEvent(q, true);
            return;
        }

        // Pointer event was unhandled.
        finishInputEvent(q, false);
    }

    private void deliverTrackballEvent(QueuedInputEvent q) {
        final MotionEvent event = (MotionEvent)q.mEvent;
        if (mInputEventConsistencyVerifier != null) {
            mInputEventConsistencyVerifier.onTrackballEvent(event, 0);
        }

        // If there is no view, then the event will not be handled.
        if (mView == null || !mAdded) {
            finishInputEvent(q, false);
            return;
        }

        // Deliver the trackball event to the view.
        if (mView.dispatchTrackballEvent(event)) {
            // If we reach this, we delivered a trackball event to mView and
            // mView consumed it. Because we will not translate the trackball
            // event into a key event, touch mode will not exit, so we exit
            // touch mode here.
            ensureTouchMode(false);

            finishInputEvent(q, true);
            mLastTrackballTime = Integer.MIN_VALUE;
            return;
        }

        // Translate the trackball event into DPAD keys and try to deliver those.
        final TrackballAxis x = mTrackballAxisX;
        final TrackballAxis y = mTrackballAxisY;

        long curTime = SystemClock.uptimeMillis();
        if ((mLastTrackballTime + MAX_TRACKBALL_DELAY) < curTime) {
            // It has been too long since the last movement,
            // so restart at the beginning.
            x.reset(0);
            y.reset(0);
            mLastTrackballTime = curTime;
        }

        final int action = event.getAction();
        final int metaState = event.getMetaState();
        switch (action) {
            case MotionEvent.ACTION_DOWN:
                x.reset(2);
                y.reset(2);
                enqueueInputEvent(new KeyEvent(curTime, curTime,
                        KeyEvent.ACTION_DOWN, KeyEvent.KEYCODE_DPAD_CENTER, 0, metaState,
                        KeyCharacterMap.VIRTUAL_KEYBOARD, 0, KeyEvent.FLAG_FALLBACK,
                        InputDevice.SOURCE_KEYBOARD));
                break;
            case MotionEvent.ACTION_UP:
                x.reset(2);
                y.reset(2);
                enqueueInputEvent(new KeyEvent(curTime, curTime,
                        KeyEvent.ACTION_UP, KeyEvent.KEYCODE_DPAD_CENTER, 0, metaState,
                        KeyCharacterMap.VIRTUAL_KEYBOARD, 0, KeyEvent.FLAG_FALLBACK,
                        InputDevice.SOURCE_KEYBOARD));
                break;
        }

        if (DEBUG_TRACKBALL) Log.v(TAG, "TB X=" + x.position + " step="
                + x.step + " dir=" + x.dir + " acc=" + x.acceleration
                + " move=" + event.getX()
                + " / Y=" + y.position + " step="
                + y.step + " dir=" + y.dir + " acc=" + y.acceleration
                + " move=" + event.getY());
        final float xOff = x.collect(event.getX(), event.getEventTime(), "X");
        final float yOff = y.collect(event.getY(), event.getEventTime(), "Y");

        // Generate DPAD events based on the trackball movement.
        // We pick the axis that has moved the most as the direction of
        // the DPAD.  When we generate DPAD events for one axis, then the
        // other axis is reset -- we don't want to perform DPAD jumps due
        // to slight movements in the trackball when making major movements
        // along the other axis.
        int keycode = 0;
        int movement = 0;
        float accel = 1;
        if (xOff > yOff) {
            movement = x.generate((2/event.getXPrecision()));
            if (movement != 0) {
                keycode = movement > 0 ? KeyEvent.KEYCODE_DPAD_RIGHT
                        : KeyEvent.KEYCODE_DPAD_LEFT;
                accel = x.acceleration;
                y.reset(2);
            }
        } else if (yOff > 0) {
            movement = y.generate((2/event.getYPrecision()));
            if (movement != 0) {
                keycode = movement > 0 ? KeyEvent.KEYCODE_DPAD_DOWN
                        : KeyEvent.KEYCODE_DPAD_UP;
                accel = y.acceleration;
                x.reset(2);
            }
        }

        if (keycode != 0) {
            if (movement < 0) movement = -movement;
            int accelMovement = (int)(movement * accel);
            if (DEBUG_TRACKBALL) Log.v(TAG, "Move: movement=" + movement
                    + " accelMovement=" + accelMovement
                    + " accel=" + accel);
            if (accelMovement > movement) {
                if (DEBUG_TRACKBALL) Log.v("foo", "Delivering fake DPAD: "
                        + keycode);
                movement--;
                int repeatCount = accelMovement - movement;
                enqueueInputEvent(new KeyEvent(curTime, curTime,
                        KeyEvent.ACTION_MULTIPLE, keycode, repeatCount, metaState,
                        KeyCharacterMap.VIRTUAL_KEYBOARD, 0, KeyEvent.FLAG_FALLBACK,
                        InputDevice.SOURCE_KEYBOARD));
            }
            while (movement > 0) {
                if (DEBUG_TRACKBALL) Log.v("foo", "Delivering fake DPAD: "
                        + keycode);
                movement--;
                curTime = SystemClock.uptimeMillis();
                enqueueInputEvent(new KeyEvent(curTime, curTime,
                        KeyEvent.ACTION_DOWN, keycode, 0, metaState,
                        KeyCharacterMap.VIRTUAL_KEYBOARD, 0, KeyEvent.FLAG_FALLBACK,
                        InputDevice.SOURCE_KEYBOARD));
                enqueueInputEvent(new KeyEvent(curTime, curTime,
                        KeyEvent.ACTION_UP, keycode, 0, metaState,
                        KeyCharacterMap.VIRTUAL_KEYBOARD, 0, KeyEvent.FLAG_FALLBACK,
                        InputDevice.SOURCE_KEYBOARD));
            }
            mLastTrackballTime = curTime;
        }

        // Unfortunately we can't tell whether the application consumed the keys, so
        // we always consider the trackball event handled.
        finishInputEvent(q, true);
    }

    private void deliverGenericMotionEvent(QueuedInputEvent q) {
        final MotionEvent event = (MotionEvent)q.mEvent;
        if (mInputEventConsistencyVerifier != null) {
            mInputEventConsistencyVerifier.onGenericMotionEvent(event, 0);
        }

        final int source = event.getSource();
        final boolean isJoystick = (source & InputDevice.SOURCE_CLASS_JOYSTICK) != 0;

        // If there is no view, then the event will not be handled.
        if (mView == null || !mAdded) {
            if (isJoystick) {
                updateJoystickDirection(event, false);
            }
            finishInputEvent(q, false);
            return;
        }

        // Deliver the event to the view.
        if (mView.dispatchGenericMotionEvent(event)) {
            if (isJoystick) {
                updateJoystickDirection(event, false);
            }
            finishInputEvent(q, true);
            return;
        }

        if (isJoystick) {
            // Translate the joystick event into DPAD keys and try to deliver those.
            updateJoystickDirection(event, true);
            finishInputEvent(q, true);
        } else {
            finishInputEvent(q, false);
        }
    }

    private void updateJoystickDirection(MotionEvent event, boolean synthesizeNewKeys) {
        final long time = event.getEventTime();
        final int metaState = event.getMetaState();
        final int deviceId = event.getDeviceId();
        final int source = event.getSource();

        int xDirection = joystickAxisValueToDirection(event.getAxisValue(MotionEvent.AXIS_HAT_X));
        if (xDirection == 0) {
            xDirection = joystickAxisValueToDirection(event.getX());
        }

        int yDirection = joystickAxisValueToDirection(event.getAxisValue(MotionEvent.AXIS_HAT_Y));
        if (yDirection == 0) {
            yDirection = joystickAxisValueToDirection(event.getY());
        }

        if (xDirection != mLastJoystickXDirection) {
            if (mLastJoystickXKeyCode != 0) {
                enqueueInputEvent(new KeyEvent(time, time,
                        KeyEvent.ACTION_UP, mLastJoystickXKeyCode, 0, metaState,
                        deviceId, 0, KeyEvent.FLAG_FALLBACK, source));
                mLastJoystickXKeyCode = 0;
            }

            mLastJoystickXDirection = xDirection;

            if (xDirection != 0 && synthesizeNewKeys) {
                mLastJoystickXKeyCode = xDirection > 0
                        ? KeyEvent.KEYCODE_DPAD_RIGHT : KeyEvent.KEYCODE_DPAD_LEFT;
                enqueueInputEvent(new KeyEvent(time, time,
                        KeyEvent.ACTION_DOWN, mLastJoystickXKeyCode, 0, metaState,
                        deviceId, 0, KeyEvent.FLAG_FALLBACK, source));
            }
        }

        if (yDirection != mLastJoystickYDirection) {
            if (mLastJoystickYKeyCode != 0) {
                enqueueInputEvent(new KeyEvent(time, time,
                        KeyEvent.ACTION_UP, mLastJoystickYKeyCode, 0, metaState,
                        deviceId, 0, KeyEvent.FLAG_FALLBACK, source));
                mLastJoystickYKeyCode = 0;
            }

            mLastJoystickYDirection = yDirection;

            if (yDirection != 0 && synthesizeNewKeys) {
                mLastJoystickYKeyCode = yDirection > 0
                        ? KeyEvent.KEYCODE_DPAD_DOWN : KeyEvent.KEYCODE_DPAD_UP;
                enqueueInputEvent(new KeyEvent(time, time,
                        KeyEvent.ACTION_DOWN, mLastJoystickYKeyCode, 0, metaState,
                        deviceId, 0, KeyEvent.FLAG_FALLBACK, source));
            }
        }
    }

    private static int joystickAxisValueToDirection(float value) {
        if (value >= 0.5f) {
            return 1;
        } else if (value <= -0.5f) {
            return -1;
        } else {
            return 0;
        }
    }

    /**
     * Returns true if the key is used for keyboard navigation.
     * @param keyEvent The key event.
     * @return True if the key is used for keyboard navigation.
     */
    private static boolean isNavigationKey(KeyEvent keyEvent) {
        switch (keyEvent.getKeyCode()) {
        case KeyEvent.KEYCODE_DPAD_LEFT:
        case KeyEvent.KEYCODE_DPAD_RIGHT:
        case KeyEvent.KEYCODE_DPAD_UP:
        case KeyEvent.KEYCODE_DPAD_DOWN:
        case KeyEvent.KEYCODE_DPAD_CENTER:
        case KeyEvent.KEYCODE_PAGE_UP:
        case KeyEvent.KEYCODE_PAGE_DOWN:
        case KeyEvent.KEYCODE_MOVE_HOME:
        case KeyEvent.KEYCODE_MOVE_END:
        case KeyEvent.KEYCODE_TAB:
        case KeyEvent.KEYCODE_SPACE:
        case KeyEvent.KEYCODE_ENTER:
            return true;
        }
        return false;
    }

    /**
     * Returns true if the key is used for typing.
     * @param keyEvent The key event.
     * @return True if the key is used for typing.
     */
    private static boolean isTypingKey(KeyEvent keyEvent) {
        return keyEvent.getUnicodeChar() > 0;
    }

    /**
     * See if the key event means we should leave touch mode (and leave touch mode if so).
     * @param event The key event.
     * @return Whether this key event should be consumed (meaning the act of
     *   leaving touch mode alone is considered the event).
     */
    private boolean checkForLeavingTouchModeAndConsume(KeyEvent event) {
        // Only relevant in touch mode.
        if (!mAttachInfo.mInTouchMode) {
            return false;
        }

        // Only consider leaving touch mode on DOWN or MULTIPLE actions, never on UP.
        final int action = event.getAction();
        if (action != KeyEvent.ACTION_DOWN && action != KeyEvent.ACTION_MULTIPLE) {
            return false;
        }

        // Don't leave touch mode if the IME told us not to.
        if ((event.getFlags() & KeyEvent.FLAG_KEEP_TOUCH_MODE) != 0) {
            return false;
        }

        // If the key can be used for keyboard navigation then leave touch mode
        // and select a focused view if needed (in ensureTouchMode).
        // When a new focused view is selected, we consume the navigation key because
        // navigation doesn't make much sense unless a view already has focus so
        // the key's purpose is to set focus.
        if (isNavigationKey(event)) {
            return ensureTouchMode(false);
        }

        // If the key can be used for typing then leave touch mode
        // and select a focused view if needed (in ensureTouchMode).
        // Always allow the view to process the typing key.
        if (isTypingKey(event)) {
            ensureTouchMode(false);
            return false;
        }

        return false;
    }

    private void deliverKeyEvent(QueuedInputEvent q) {
        final KeyEvent event = (KeyEvent)q.mEvent;
        if (mInputEventConsistencyVerifier != null) {
            mInputEventConsistencyVerifier.onKeyEvent(event, 0);
        }

        if ((q.mFlags & QueuedInputEvent.FLAG_DELIVER_POST_IME) == 0) {
            // If there is no view, then the event will not be handled.
            if (mView == null || !mAdded) {
                finishInputEvent(q, false);
                return;
            }

            if (LOCAL_LOGV) Log.v(TAG, "Dispatching key " + event + " to " + mView);

            // Perform predispatching before the IME.
            if (mView.dispatchKeyEventPreIme(event)) {
                finishInputEvent(q, true);
                return;
            }

            // Dispatch to the IME before propagating down the view hierarchy.
            // The IME will eventually call back into handleImeFinishedEvent.
            if (mLastWasImTarget) {
                InputMethodManager imm = InputMethodManager.peekInstance();
                if (imm != null) {
                    final int seq = event.getSequenceNumber();
                    if (DEBUG_IMF) Log.v(TAG, "Sending key event to IME: seq="
                            + seq + " event=" + event);
                    imm.dispatchKeyEvent(mView.getContext(), seq, event, mInputMethodCallback);
                    return;