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      1 /*
      2  * Copyright (C) 2010 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package android.app;
     18 
     19 import android.content.Context;
     20 import android.content.pm.ActivityInfo;
     21 import android.content.pm.PackageManager;
     22 import android.content.res.AssetManager;
     23 import android.content.res.Configuration;
     24 import android.graphics.PixelFormat;
     25 import android.os.Build;
     26 import android.os.Bundle;
     27 import android.os.Looper;
     28 import android.os.MessageQueue;
     29 import android.util.AttributeSet;
     30 import android.view.InputQueue;
     31 import android.view.Surface;
     32 import android.view.SurfaceHolder;
     33 import android.view.View;
     34 import android.view.ViewTreeObserver.OnGlobalLayoutListener;
     35 import android.view.WindowManager;
     36 import android.view.inputmethod.InputMethodManager;
     37 
     38 import dalvik.system.BaseDexClassLoader;
     39 
     40 import java.io.File;
     41 
     42 /**
     43  * Convenience for implementing an activity that will be implemented
     44  * purely in native code.  That is, a game (or game-like thing).  There
     45  * is no need to derive from this class; you can simply declare it in your
     46  * manifest, and use the NDK APIs from there.
     47  *
     48  * <p>A typical manifest would look like:
     49  *
     50  * {@sample development/ndk/platforms/android-9/samples/native-activity/AndroidManifest.xml
     51  *      manifest}
     52  *
     53  * <p>A very simple example of native code that is run by NativeActivity
     54  * follows.  This reads input events from the user and uses OpenGLES to
     55  * draw into the native activity's window.
     56  *
     57  * {@sample development/ndk/platforms/android-9/samples/native-activity/jni/main.c all}
     58  */
     59 public class NativeActivity extends Activity implements SurfaceHolder.Callback2,
     60         InputQueue.Callback, OnGlobalLayoutListener {
     61     /**
     62      * Optional meta-that can be in the manifest for this component, specifying
     63      * the name of the native shared library to load.  If not specified,
     64      * "main" is used.
     65      */
     66     public static final String META_DATA_LIB_NAME = "android.app.lib_name";
     67 
     68     /**
     69      * Optional meta-that can be in the manifest for this component, specifying
     70      * the name of the main entry point for this native activity in the
     71      * {@link #META_DATA_LIB_NAME} native code.  If not specified,
     72      * "ANativeActivity_onCreate" is used.
     73      */
     74     public static final String META_DATA_FUNC_NAME = "android.app.func_name";
     75 
     76     private static final String KEY_NATIVE_SAVED_STATE = "android:native_state";
     77 
     78     private NativeContentView mNativeContentView;
     79     private InputMethodManager mIMM;
     80 
     81     private long mNativeHandle;
     82 
     83     private InputQueue mCurInputQueue;
     84     private SurfaceHolder mCurSurfaceHolder;
     85 
     86     final int[] mLocation = new int[2];
     87     int mLastContentX;
     88     int mLastContentY;
     89     int mLastContentWidth;
     90     int mLastContentHeight;
     91 
     92     private boolean mDispatchingUnhandledKey;
     93 
     94     private boolean mDestroyed;
     95 
     96     private native long loadNativeCode(String path, String funcname, MessageQueue queue,
     97             String internalDataPath, String obbPath, String externalDataPath, int sdkVersion,
     98             AssetManager assetMgr, byte[] savedState, ClassLoader classLoader, String libraryPath);
     99     private native String getDlError();
    100     private native void unloadNativeCode(long handle);
    101     private native void onStartNative(long handle);
    102     private native void onResumeNative(long handle);
    103     private native byte[] onSaveInstanceStateNative(long handle);
    104     private native void onPauseNative(long handle);
    105     private native void onStopNative(long handle);
    106     private native void onConfigurationChangedNative(long handle);
    107     private native void onLowMemoryNative(long handle);
    108     private native void onWindowFocusChangedNative(long handle, boolean focused);
    109     private native void onSurfaceCreatedNative(long handle, Surface surface);
    110     private native void onSurfaceChangedNative(long handle, Surface surface,
    111             int format, int width, int height);
    112     private native void onSurfaceRedrawNeededNative(long handle, Surface surface);
    113     private native void onSurfaceDestroyedNative(long handle);
    114     private native void onInputQueueCreatedNative(long handle, long queuePtr);
    115     private native void onInputQueueDestroyedNative(long handle, long queuePtr);
    116     private native void onContentRectChangedNative(long handle, int x, int y, int w, int h);
    117 
    118     static class NativeContentView extends View {
    119         NativeActivity mActivity;
    120 
    121         public NativeContentView(Context context) {
    122             super(context);
    123         }
    124 
    125         public NativeContentView(Context context, AttributeSet attrs) {
    126             super(context, attrs);
    127         }
    128     }
    129 
    130     @Override
    131     protected void onCreate(Bundle savedInstanceState) {
    132         String libname = "main";
    133         String funcname = "ANativeActivity_onCreate";
    134         ActivityInfo ai;
    135 
    136         mIMM = getSystemService(InputMethodManager.class);
    137 
    138         getWindow().takeSurface(this);
    139         getWindow().takeInputQueue(this);
    140         getWindow().setFormat(PixelFormat.RGB_565);
    141         getWindow().setSoftInputMode(
    142                 WindowManager.LayoutParams.SOFT_INPUT_STATE_UNSPECIFIED
    143                 | WindowManager.LayoutParams.SOFT_INPUT_ADJUST_RESIZE);
    144 
    145         mNativeContentView = new NativeContentView(this);
    146         mNativeContentView.mActivity = this;
    147         setContentView(mNativeContentView);
    148         mNativeContentView.requestFocus();
    149         mNativeContentView.getViewTreeObserver().addOnGlobalLayoutListener(this);
    150 
    151         try {
    152             ai = getPackageManager().getActivityInfo(
    153                     getIntent().getComponent(), PackageManager.GET_META_DATA);
    154             if (ai.metaData != null) {
    155                 String ln = ai.metaData.getString(META_DATA_LIB_NAME);
    156                 if (ln != null) libname = ln;
    157                 ln = ai.metaData.getString(META_DATA_FUNC_NAME);
    158                 if (ln != null) funcname = ln;
    159             }
    160         } catch (PackageManager.NameNotFoundException e) {
    161             throw new RuntimeException("Error getting activity info", e);
    162         }
    163 
    164         BaseDexClassLoader classLoader = (BaseDexClassLoader) getClassLoader();
    165         String path = classLoader.findLibrary(libname);
    166 
    167         if (path == null) {
    168             throw new IllegalArgumentException("Unable to find native library " + libname +
    169                                                " using classloader: " + classLoader.toString());
    170         }
    171 
    172         byte[] nativeSavedState = savedInstanceState != null
    173                 ? savedInstanceState.getByteArray(KEY_NATIVE_SAVED_STATE) : null;
    174 
    175         mNativeHandle = loadNativeCode(path, funcname, Looper.myQueue(),
    176                 getAbsolutePath(getFilesDir()), getAbsolutePath(getObbDir()),
    177                 getAbsolutePath(getExternalFilesDir(null)),
    178                 Build.VERSION.SDK_INT, getAssets(), nativeSavedState,
    179                 classLoader, classLoader.getLdLibraryPath());
    180 
    181         if (mNativeHandle == 0) {
    182             throw new UnsatisfiedLinkError(
    183                     "Unable to load native library \"" + path + "\": " + getDlError());
    184         }
    185         super.onCreate(savedInstanceState);
    186     }
    187 
    188     private static String getAbsolutePath(File file) {
    189         return (file != null) ? file.getAbsolutePath() : null;
    190     }
    191 
    192     @Override
    193     protected void onDestroy() {
    194         mDestroyed = true;
    195         if (mCurSurfaceHolder != null) {
    196             onSurfaceDestroyedNative(mNativeHandle);
    197             mCurSurfaceHolder = null;
    198         }
    199         if (mCurInputQueue != null) {
    200             onInputQueueDestroyedNative(mNativeHandle, mCurInputQueue.getNativePtr());
    201             mCurInputQueue = null;
    202         }
    203         unloadNativeCode(mNativeHandle);
    204         super.onDestroy();
    205     }
    206 
    207     @Override
    208     protected void onPause() {
    209         super.onPause();
    210         onPauseNative(mNativeHandle);
    211     }
    212 
    213     @Override
    214     protected void onResume() {
    215         super.onResume();
    216         onResumeNative(mNativeHandle);
    217     }
    218 
    219     @Override
    220     protected void onSaveInstanceState(Bundle outState) {
    221         super.onSaveInstanceState(outState);
    222         byte[] state = onSaveInstanceStateNative(mNativeHandle);
    223         if (state != null) {
    224             outState.putByteArray(KEY_NATIVE_SAVED_STATE, state);
    225         }
    226     }
    227 
    228     @Override
    229     protected void onStart() {
    230         super.onStart();
    231         onStartNative(mNativeHandle);
    232     }
    233 
    234     @Override
    235     protected void onStop() {
    236         super.onStop();
    237         onStopNative(mNativeHandle);
    238     }
    239 
    240     @Override
    241     public void onConfigurationChanged(Configuration newConfig) {
    242         super.onConfigurationChanged(newConfig);
    243         if (!mDestroyed) {
    244             onConfigurationChangedNative(mNativeHandle);
    245         }
    246     }
    247 
    248     @Override
    249     public void onLowMemory() {
    250         super.onLowMemory();
    251         if (!mDestroyed) {
    252             onLowMemoryNative(mNativeHandle);
    253         }
    254     }
    255 
    256     @Override
    257     public void onWindowFocusChanged(boolean hasFocus) {
    258         super.onWindowFocusChanged(hasFocus);
    259         if (!mDestroyed) {
    260             onWindowFocusChangedNative(mNativeHandle, hasFocus);
    261         }
    262     }
    263 
    264     public void surfaceCreated(SurfaceHolder holder) {
    265         if (!mDestroyed) {
    266             mCurSurfaceHolder = holder;
    267             onSurfaceCreatedNative(mNativeHandle, holder.getSurface());
    268         }
    269     }
    270 
    271     public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
    272         if (!mDestroyed) {
    273             mCurSurfaceHolder = holder;
    274             onSurfaceChangedNative(mNativeHandle, holder.getSurface(), format, width, height);
    275         }
    276     }
    277 
    278     public void surfaceRedrawNeeded(SurfaceHolder holder) {
    279         if (!mDestroyed) {
    280             mCurSurfaceHolder = holder;
    281             onSurfaceRedrawNeededNative(mNativeHandle, holder.getSurface());
    282         }
    283     }
    284 
    285     public void surfaceDestroyed(SurfaceHolder holder) {
    286         mCurSurfaceHolder = null;
    287         if (!mDestroyed) {
    288             onSurfaceDestroyedNative(mNativeHandle);
    289         }
    290     }
    291 
    292     public void onInputQueueCreated(InputQueue queue) {
    293         if (!mDestroyed) {
    294             mCurInputQueue = queue;
    295             onInputQueueCreatedNative(mNativeHandle, queue.getNativePtr());
    296         }
    297     }
    298 
    299     public void onInputQueueDestroyed(InputQueue queue) {
    300         if (!mDestroyed) {
    301             onInputQueueDestroyedNative(mNativeHandle, queue.getNativePtr());
    302             mCurInputQueue = null;
    303         }
    304     }
    305 
    306     public void onGlobalLayout() {
    307         mNativeContentView.getLocationInWindow(mLocation);
    308         int w = mNativeContentView.getWidth();
    309         int h = mNativeContentView.getHeight();
    310         if (mLocation[0] != mLastContentX || mLocation[1] != mLastContentY
    311                 || w != mLastContentWidth || h != mLastContentHeight) {
    312             mLastContentX = mLocation[0];
    313             mLastContentY = mLocation[1];
    314             mLastContentWidth = w;
    315             mLastContentHeight = h;
    316             if (!mDestroyed) {
    317                 onContentRectChangedNative(mNativeHandle, mLastContentX,
    318                         mLastContentY, mLastContentWidth, mLastContentHeight);
    319             }
    320         }
    321     }
    322 
    323     void setWindowFlags(int flags, int mask) {
    324         getWindow().setFlags(flags, mask);
    325     }
    326 
    327     void setWindowFormat(int format) {
    328         getWindow().setFormat(format);
    329     }
    330 
    331     void showIme(int mode) {
    332         mIMM.showSoftInput(mNativeContentView, mode);
    333     }
    334 
    335     void hideIme(int mode) {
    336         mIMM.hideSoftInputFromWindow(mNativeContentView.getWindowToken(), mode);
    337     }
    338 }
    339