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      1 /*
      2  * Copyright (C) 2006 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 com.android.server.am;
     18 
     19 import com.android.server.AttributeCache;
     20 import com.android.server.am.ActivityStack.ActivityState;
     21 
     22 import android.app.Activity;
     23 import android.content.ComponentName;
     24 import android.content.Intent;
     25 import android.content.pm.ActivityInfo;
     26 import android.content.pm.ApplicationInfo;
     27 import android.content.res.CompatibilityInfo;
     28 import android.content.res.Configuration;
     29 import android.graphics.Bitmap;
     30 import android.os.Build;
     31 import android.os.Bundle;
     32 import android.os.IBinder;
     33 import android.os.Message;
     34 import android.os.Process;
     35 import android.os.RemoteException;
     36 import android.os.SystemClock;
     37 import android.util.EventLog;
     38 import android.util.Log;
     39 import android.util.Slog;
     40 import android.util.TimeUtils;
     41 import android.view.IApplicationToken;
     42 import android.view.WindowManager;
     43 
     44 import java.io.PrintWriter;
     45 import java.lang.ref.WeakReference;
     46 import java.util.ArrayList;
     47 import java.util.HashSet;
     48 
     49 /**
     50  * An entry in the history stack, representing an activity.
     51  */
     52 final class ActivityRecord {
     53     final ActivityManagerService service; // owner
     54     final ActivityStack stack; // owner
     55     final IApplicationToken.Stub appToken; // window manager token
     56     final ActivityInfo info; // all about me
     57     final int launchedFromUid; // always the uid who started the activity.
     58     final Intent intent;    // the original intent that generated us
     59     final ComponentName realActivity;  // the intent component, or target of an alias.
     60     final String shortComponentName; // the short component name of the intent
     61     final String resolvedType; // as per original caller;
     62     final String packageName; // the package implementing intent's component
     63     final String processName; // process where this component wants to run
     64     final String taskAffinity; // as per ActivityInfo.taskAffinity
     65     final boolean stateNotNeeded; // As per ActivityInfo.flags
     66     final boolean fullscreen; // covers the full screen?
     67     final boolean noDisplay;  // activity is not displayed?
     68     final boolean componentSpecified;  // did caller specifiy an explicit component?
     69     final boolean isHomeActivity; // do we consider this to be a home activity?
     70     final String baseDir;   // where activity source (resources etc) located
     71     final String resDir;   // where public activity source (public resources etc) located
     72     final String dataDir;   // where activity data should go
     73     CharSequence nonLocalizedLabel;  // the label information from the package mgr.
     74     int labelRes;           // the label information from the package mgr.
     75     int icon;               // resource identifier of activity's icon.
     76     int theme;              // resource identifier of activity's theme.
     77     int realTheme;          // actual theme resource we will use, never 0.
     78     int windowFlags;        // custom window flags for preview window.
     79     TaskRecord task;        // the task this is in.
     80     ThumbnailHolder thumbHolder; // where our thumbnails should go.
     81     long launchTime;        // when we starting launching this activity
     82     long startTime;         // last time this activity was started
     83     long lastVisibleTime;   // last time this activity became visible
     84     long cpuTimeAtResume;   // the cpu time of host process at the time of resuming activity
     85     long pauseTime;         // last time we started pausing the activity
     86     long launchTickTime;    // base time for launch tick messages
     87     Configuration configuration; // configuration activity was last running in
     88     CompatibilityInfo compat;// last used compatibility mode
     89     ActivityRecord resultTo; // who started this entry, so will get our reply
     90     final String resultWho; // additional identifier for use by resultTo.
     91     final int requestCode;  // code given by requester (resultTo)
     92     ArrayList results;      // pending ActivityResult objs we have received
     93     HashSet<WeakReference<PendingIntentRecord>> pendingResults; // all pending intents for this act
     94     ArrayList newIntents;   // any pending new intents for single-top mode
     95     HashSet<ConnectionRecord> connections; // All ConnectionRecord we hold
     96     UriPermissionOwner uriPermissions; // current special URI access perms.
     97     ProcessRecord app;      // if non-null, hosting application
     98     ActivityState state;    // current state we are in
     99     Bundle  icicle;         // last saved activity state
    100     boolean frontOfTask;    // is this the root activity of its task?
    101     boolean launchFailed;   // set if a launched failed, to abort on 2nd try
    102     boolean haveState;      // have we gotten the last activity state?
    103     boolean stopped;        // is activity pause finished?
    104     boolean delayedResume;  // not yet resumed because of stopped app switches?
    105     boolean finishing;      // activity in pending finish list?
    106     boolean configDestroy;  // need to destroy due to config change?
    107     int configChangeFlags;  // which config values have changed
    108     boolean keysPaused;     // has key dispatching been paused for it?
    109     int launchMode;         // the launch mode activity attribute.
    110     boolean visible;        // does this activity's window need to be shown?
    111     boolean sleeping;       // have we told the activity to sleep?
    112     boolean waitingVisible; // true if waiting for a new act to become vis
    113     boolean nowVisible;     // is this activity's window visible?
    114     boolean thumbnailNeeded;// has someone requested a thumbnail?
    115     boolean idle;           // has the activity gone idle?
    116     boolean hasBeenLaunched;// has this activity ever been launched?
    117     boolean frozenBeforeDestroy;// has been frozen but not yet destroyed.
    118     boolean immersive;      // immersive mode (don't interrupt if possible)
    119     boolean forceNewConfig; // force re-create with new config next time
    120 
    121     String stringName;      // for caching of toString().
    122 
    123     private boolean inHistory;  // are we in the history stack?
    124 
    125     void dump(PrintWriter pw, String prefix) {
    126         pw.print(prefix); pw.print("packageName="); pw.print(packageName);
    127                 pw.print(" processName="); pw.println(processName);
    128         pw.print(prefix); pw.print("launchedFromUid="); pw.print(launchedFromUid);
    129                 pw.print(" app="); pw.println(app);
    130         pw.print(prefix); pw.println(intent.toInsecureString());
    131         pw.print(prefix); pw.print("frontOfTask="); pw.print(frontOfTask);
    132                 pw.print(" task="); pw.println(task);
    133         pw.print(prefix); pw.print("taskAffinity="); pw.println(taskAffinity);
    134         pw.print(prefix); pw.print("realActivity=");
    135                 pw.println(realActivity.flattenToShortString());
    136         pw.print(prefix); pw.print("base="); pw.print(baseDir);
    137                 if (!resDir.equals(baseDir)) pw.print(" res="); pw.print(resDir);
    138                 pw.print(" data="); pw.println(dataDir);
    139         pw.print(prefix); pw.print("labelRes=0x");
    140                 pw.print(Integer.toHexString(labelRes));
    141                 pw.print(" icon=0x"); pw.print(Integer.toHexString(icon));
    142                 pw.print(" theme=0x"); pw.println(Integer.toHexString(theme));
    143         pw.print(prefix); pw.print("stateNotNeeded="); pw.print(stateNotNeeded);
    144                 pw.print(" componentSpecified="); pw.print(componentSpecified);
    145                 pw.print(" isHomeActivity="); pw.println(isHomeActivity);
    146         pw.print(prefix); pw.print("config="); pw.println(configuration);
    147         pw.print(prefix); pw.print("compat="); pw.println(compat);
    148         if (resultTo != null || resultWho != null) {
    149             pw.print(prefix); pw.print("resultTo="); pw.print(resultTo);
    150                     pw.print(" resultWho="); pw.print(resultWho);
    151                     pw.print(" resultCode="); pw.println(requestCode);
    152         }
    153         if (results != null) {
    154             pw.print(prefix); pw.print("results="); pw.println(results);
    155         }
    156         if (pendingResults != null) {
    157             pw.print(prefix); pw.print("pendingResults="); pw.println(pendingResults);
    158         }
    159         if (uriPermissions != null) {
    160             if (uriPermissions.readUriPermissions != null) {
    161                 pw.print(prefix); pw.print("readUriPermissions=");
    162                         pw.println(uriPermissions.readUriPermissions);
    163             }
    164             if (uriPermissions.writeUriPermissions != null) {
    165                 pw.print(prefix); pw.print("writeUriPermissions=");
    166                         pw.println(uriPermissions.writeUriPermissions);
    167             }
    168         }
    169         pw.print(prefix); pw.print("launchFailed="); pw.print(launchFailed);
    170                 pw.print(" haveState="); pw.print(haveState);
    171                 pw.print(" icicle="); pw.println(icicle);
    172         pw.print(prefix); pw.print("state="); pw.print(state);
    173                 pw.print(" stopped="); pw.print(stopped);
    174                 pw.print(" delayedResume="); pw.print(delayedResume);
    175                 pw.print(" finishing="); pw.println(finishing);
    176         pw.print(prefix); pw.print("keysPaused="); pw.print(keysPaused);
    177                 pw.print(" inHistory="); pw.print(inHistory);
    178                 pw.print(" visible="); pw.print(visible);
    179                 pw.print(" sleeping="); pw.print(sleeping);
    180                 pw.print(" idle="); pw.println(idle);
    181         pw.print(prefix); pw.print("fullscreen="); pw.print(fullscreen);
    182                 pw.print(" noDisplay="); pw.print(noDisplay);
    183                 pw.print(" immersive="); pw.print(immersive);
    184                 pw.print(" launchMode="); pw.println(launchMode);
    185         pw.print(prefix); pw.print("frozenBeforeDestroy="); pw.print(frozenBeforeDestroy);
    186                 pw.print(" thumbnailNeeded="); pw.print(thumbnailNeeded);
    187                 pw.print(" forceNewConfig="); pw.println(forceNewConfig);
    188         pw.print(prefix); pw.print("thumbHolder="); pw.println(thumbHolder);
    189         if (launchTime != 0 || startTime != 0) {
    190             pw.print(prefix); pw.print("launchTime=");
    191                     TimeUtils.formatDuration(launchTime, pw); pw.print(" startTime=");
    192                     TimeUtils.formatDuration(startTime, pw); pw.println("");
    193         }
    194         if (lastVisibleTime != 0) {
    195             pw.print(prefix); pw.print("lastVisibleTime=");
    196                     TimeUtils.formatDuration(lastVisibleTime, pw); pw.println("");
    197         }
    198         if (waitingVisible || nowVisible) {
    199             pw.print(prefix); pw.print("waitingVisible="); pw.print(waitingVisible);
    200                     pw.print(" nowVisible="); pw.println(nowVisible);
    201         }
    202         if (configDestroy || configChangeFlags != 0) {
    203             pw.print(prefix); pw.print("configDestroy="); pw.print(configDestroy);
    204                     pw.print(" configChangeFlags=");
    205                     pw.println(Integer.toHexString(configChangeFlags));
    206         }
    207         if (connections != null) {
    208             pw.print(prefix); pw.print("connections="); pw.println(connections);
    209         }
    210     }
    211 
    212     static class Token extends IApplicationToken.Stub {
    213         final WeakReference<ActivityRecord> weakActivity;
    214 
    215         Token(ActivityRecord activity) {
    216             weakActivity = new WeakReference<ActivityRecord>(activity);
    217         }
    218 
    219         @Override public void windowsDrawn() throws RemoteException {
    220             ActivityRecord activity = weakActivity.get();
    221             if (activity != null) {
    222                 activity.windowsDrawn();
    223             }
    224         }
    225 
    226         @Override public void windowsVisible() throws RemoteException {
    227             ActivityRecord activity = weakActivity.get();
    228             if (activity != null) {
    229                 activity.windowsVisible();
    230             }
    231         }
    232 
    233         @Override public void windowsGone() throws RemoteException {
    234             ActivityRecord activity = weakActivity.get();
    235             if (activity != null) {
    236                 activity.windowsGone();
    237             }
    238         }
    239 
    240         @Override public boolean keyDispatchingTimedOut() throws RemoteException {
    241             ActivityRecord activity = weakActivity.get();
    242             if (activity != null) {
    243                 return activity.keyDispatchingTimedOut();
    244             }
    245             return false;
    246         }
    247 
    248         @Override public long getKeyDispatchingTimeout() throws RemoteException {
    249             ActivityRecord activity = weakActivity.get();
    250             if (activity != null) {
    251                 return activity.getKeyDispatchingTimeout();
    252             }
    253             return 0;
    254         }
    255 
    256         public String toString() {
    257             StringBuilder sb = new StringBuilder(128);
    258             sb.append("Token{");
    259             sb.append(Integer.toHexString(System.identityHashCode(this)));
    260             sb.append(' ');
    261             sb.append(weakActivity.get());
    262             sb.append('}');
    263             return sb.toString();
    264         }
    265     }
    266 
    267     static ActivityRecord forToken(IBinder token) {
    268         try {
    269             return token != null ? ((Token)token).weakActivity.get() : null;
    270         } catch (ClassCastException e) {
    271             Slog.w(ActivityManagerService.TAG, "Bad activity token: " + token, e);
    272             return null;
    273         }
    274     }
    275 
    276     ActivityRecord(ActivityManagerService _service, ActivityStack _stack, ProcessRecord _caller,
    277             int _launchedFromUid, Intent _intent, String _resolvedType,
    278             ActivityInfo aInfo, Configuration _configuration,
    279             ActivityRecord _resultTo, String _resultWho, int _reqCode,
    280             boolean _componentSpecified) {
    281         service = _service;
    282         stack = _stack;
    283         appToken = new Token(this);
    284         info = aInfo;
    285         launchedFromUid = _launchedFromUid;
    286         intent = _intent;
    287         shortComponentName = _intent.getComponent().flattenToShortString();
    288         resolvedType = _resolvedType;
    289         componentSpecified = _componentSpecified;
    290         configuration = _configuration;
    291         resultTo = _resultTo;
    292         resultWho = _resultWho;
    293         requestCode = _reqCode;
    294         state = ActivityState.INITIALIZING;
    295         frontOfTask = false;
    296         launchFailed = false;
    297         haveState = false;
    298         stopped = false;
    299         delayedResume = false;
    300         finishing = false;
    301         configDestroy = false;
    302         keysPaused = false;
    303         inHistory = false;
    304         visible = true;
    305         waitingVisible = false;
    306         nowVisible = false;
    307         thumbnailNeeded = false;
    308         idle = false;
    309         hasBeenLaunched = false;
    310 
    311         if (aInfo != null) {
    312             if (aInfo.targetActivity == null
    313                     || aInfo.launchMode == ActivityInfo.LAUNCH_MULTIPLE
    314                     || aInfo.launchMode == ActivityInfo.LAUNCH_SINGLE_TOP) {
    315                 realActivity = _intent.getComponent();
    316             } else {
    317                 realActivity = new ComponentName(aInfo.packageName,
    318                         aInfo.targetActivity);
    319             }
    320             taskAffinity = aInfo.taskAffinity;
    321             stateNotNeeded = (aInfo.flags&
    322                     ActivityInfo.FLAG_STATE_NOT_NEEDED) != 0;
    323             baseDir = aInfo.applicationInfo.sourceDir;
    324             resDir = aInfo.applicationInfo.publicSourceDir;
    325             dataDir = aInfo.applicationInfo.dataDir;
    326             nonLocalizedLabel = aInfo.nonLocalizedLabel;
    327             labelRes = aInfo.labelRes;
    328             if (nonLocalizedLabel == null && labelRes == 0) {
    329                 ApplicationInfo app = aInfo.applicationInfo;
    330                 nonLocalizedLabel = app.nonLocalizedLabel;
    331                 labelRes = app.labelRes;
    332             }
    333             icon = aInfo.getIconResource();
    334             theme = aInfo.getThemeResource();
    335             realTheme = theme;
    336             if (realTheme == 0) {
    337                 realTheme = aInfo.applicationInfo.targetSdkVersion
    338                         < Build.VERSION_CODES.HONEYCOMB
    339                         ? android.R.style.Theme
    340                         : android.R.style.Theme_Holo;
    341             }
    342             if ((aInfo.flags&ActivityInfo.FLAG_HARDWARE_ACCELERATED) != 0) {
    343                 windowFlags |= WindowManager.LayoutParams.FLAG_HARDWARE_ACCELERATED;
    344             }
    345             if ((aInfo.flags&ActivityInfo.FLAG_MULTIPROCESS) != 0
    346                     && _caller != null
    347                     && (aInfo.applicationInfo.uid == Process.SYSTEM_UID
    348                             || aInfo.applicationInfo.uid == _caller.info.uid)) {
    349                 processName = _caller.processName;
    350             } else {
    351                 processName = aInfo.processName;
    352             }
    353 
    354             if (intent != null && (aInfo.flags & ActivityInfo.FLAG_EXCLUDE_FROM_RECENTS) != 0) {
    355                 intent.addFlags(Intent.FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS);
    356             }
    357 
    358             packageName = aInfo.applicationInfo.packageName;
    359             launchMode = aInfo.launchMode;
    360 
    361             AttributeCache.Entry ent = AttributeCache.instance().get(packageName,
    362                     realTheme, com.android.internal.R.styleable.Window);
    363             fullscreen = ent != null && !ent.array.getBoolean(
    364                     com.android.internal.R.styleable.Window_windowIsFloating, false)
    365                     && !ent.array.getBoolean(
    366                     com.android.internal.R.styleable.Window_windowIsTranslucent, false);
    367             noDisplay = ent != null && ent.array.getBoolean(
    368                     com.android.internal.R.styleable.Window_windowNoDisplay, false);
    369 
    370             if (!_componentSpecified || _launchedFromUid == Process.myUid()
    371                     || _launchedFromUid == 0) {
    372                 // If we know the system has determined the component, then
    373                 // we can consider this to be a home activity...
    374                 if (Intent.ACTION_MAIN.equals(_intent.getAction()) &&
    375                         _intent.hasCategory(Intent.CATEGORY_HOME) &&
    376                         _intent.getCategories().size() == 1 &&
    377                         _intent.getData() == null &&
    378                         _intent.getType() == null &&
    379                         (intent.getFlags()&Intent.FLAG_ACTIVITY_NEW_TASK) != 0 &&
    380                         !"android".equals(realActivity.getClassName())) {
    381                     // This sure looks like a home activity!
    382                     // Note the last check is so we don't count the resolver
    383                     // activity as being home...  really, we don't care about
    384                     // doing anything special with something that comes from
    385                     // the core framework package.
    386                     isHomeActivity = true;
    387                 } else {
    388                     isHomeActivity = false;
    389                 }
    390             } else {
    391                 isHomeActivity = false;
    392             }
    393 
    394             immersive = (aInfo.flags & ActivityInfo.FLAG_IMMERSIVE) != 0;
    395         } else {
    396             realActivity = null;
    397             taskAffinity = null;
    398             stateNotNeeded = false;
    399             baseDir = null;
    400             resDir = null;
    401             dataDir = null;
    402             processName = null;
    403             packageName = null;
    404             fullscreen = true;
    405             noDisplay = false;
    406             isHomeActivity = false;
    407             immersive = false;
    408         }
    409     }
    410 
    411     void setTask(TaskRecord newTask, ThumbnailHolder newThumbHolder, boolean isRoot) {
    412         if (inHistory && !finishing) {
    413             if (task != null) {
    414                 task.numActivities--;
    415             }
    416             if (newTask != null) {
    417                 newTask.numActivities++;
    418             }
    419         }
    420         if (newThumbHolder == null) {
    421             newThumbHolder = newTask;
    422         }
    423         task = newTask;
    424         if (!isRoot && (intent.getFlags()&Intent.FLAG_ACTIVITY_CLEAR_WHEN_TASK_RESET) != 0) {
    425             // This is the start of a new sub-task.
    426             if (thumbHolder == null) {
    427                 thumbHolder = new ThumbnailHolder();
    428             }
    429         } else {
    430             thumbHolder = newThumbHolder;
    431         }
    432     }
    433 
    434     void putInHistory() {
    435         if (!inHistory) {
    436             inHistory = true;
    437             if (task != null && !finishing) {
    438                 task.numActivities++;
    439             }
    440         }
    441     }
    442 
    443     void takeFromHistory() {
    444         if (inHistory) {
    445             inHistory = false;
    446             if (task != null && !finishing) {
    447                 task.numActivities--;
    448             }
    449         }
    450     }
    451 
    452     boolean isInHistory() {
    453         return inHistory;
    454     }
    455 
    456     void makeFinishing() {
    457         if (!finishing) {
    458             finishing = true;
    459             if (task != null && inHistory) {
    460                 task.numActivities--;
    461             }
    462         }
    463     }
    464 
    465     UriPermissionOwner getUriPermissionsLocked() {
    466         if (uriPermissions == null) {
    467             uriPermissions = new UriPermissionOwner(service, this);
    468         }
    469         return uriPermissions;
    470     }
    471 
    472     void addResultLocked(ActivityRecord from, String resultWho,
    473             int requestCode, int resultCode,
    474             Intent resultData) {
    475         ActivityResult r = new ActivityResult(from, resultWho,
    476         		requestCode, resultCode, resultData);
    477         if (results == null) {
    478             results = new ArrayList();
    479         }
    480         results.add(r);
    481     }
    482 
    483     void removeResultsLocked(ActivityRecord from, String resultWho,
    484             int requestCode) {
    485         if (results != null) {
    486             for (int i=results.size()-1; i>=0; i--) {
    487                 ActivityResult r = (ActivityResult)results.get(i);
    488                 if (r.mFrom != from) continue;
    489                 if (r.mResultWho == null) {
    490                     if (resultWho != null) continue;
    491                 } else {
    492                     if (!r.mResultWho.equals(resultWho)) continue;
    493                 }
    494                 if (r.mRequestCode != requestCode) continue;
    495 
    496                 results.remove(i);
    497             }
    498         }
    499     }
    500 
    501     void addNewIntentLocked(Intent intent) {
    502         if (newIntents == null) {
    503             newIntents = new ArrayList();
    504         }
    505         newIntents.add(intent);
    506     }
    507 
    508     /**
    509      * Deliver a new Intent to an existing activity, so that its onNewIntent()
    510      * method will be called at the proper time.
    511      */
    512     final void deliverNewIntentLocked(int callingUid, Intent intent) {
    513         boolean sent = false;
    514         if (state == ActivityState.RESUMED
    515                 && app != null && app.thread != null) {
    516             try {
    517                 ArrayList<Intent> ar = new ArrayList<Intent>();
    518                 intent = new Intent(intent);
    519                 ar.add(intent);
    520                 service.grantUriPermissionFromIntentLocked(callingUid, packageName,
    521                         intent, getUriPermissionsLocked());
    522                 app.thread.scheduleNewIntent(ar, appToken);
    523                 sent = true;
    524             } catch (RemoteException e) {
    525                 Slog.w(ActivityManagerService.TAG,
    526                         "Exception thrown sending new intent to " + this, e);
    527             } catch (NullPointerException e) {
    528                 Slog.w(ActivityManagerService.TAG,
    529                         "Exception thrown sending new intent to " + this, e);
    530             }
    531         }
    532         if (!sent) {
    533             addNewIntentLocked(new Intent(intent));
    534         }
    535     }
    536 
    537     void removeUriPermissionsLocked() {
    538         if (uriPermissions != null) {
    539             uriPermissions.removeUriPermissionsLocked();
    540             uriPermissions = null;
    541         }
    542     }
    543 
    544     void pauseKeyDispatchingLocked() {
    545         if (!keysPaused) {
    546             keysPaused = true;
    547             service.mWindowManager.pauseKeyDispatching(appToken);
    548         }
    549     }
    550 
    551     void resumeKeyDispatchingLocked() {
    552         if (keysPaused) {
    553             keysPaused = false;
    554             service.mWindowManager.resumeKeyDispatching(appToken);
    555         }
    556     }
    557 
    558     void updateThumbnail(Bitmap newThumbnail, CharSequence description) {
    559         if ((intent.getFlags()&Intent.FLAG_ACTIVITY_CLEAR_WHEN_TASK_RESET) != 0) {
    560             // This is a logical break in the task; it repre
    561         }
    562         if (thumbHolder != null) {
    563             if (newThumbnail != null) {
    564                 thumbHolder.lastThumbnail = newThumbnail;
    565             }
    566             thumbHolder.lastDescription = description;
    567         }
    568     }
    569 
    570     void clearThumbnail() {
    571         if (thumbHolder != null) {
    572             thumbHolder.lastThumbnail = null;
    573             thumbHolder.lastDescription = null;
    574         }
    575     }
    576 
    577     void startLaunchTickingLocked() {
    578         if (ActivityManagerService.IS_USER_BUILD) {
    579             return;
    580         }
    581         if (launchTickTime == 0) {
    582             launchTickTime = SystemClock.uptimeMillis();
    583             continueLaunchTickingLocked();
    584         }
    585     }
    586 
    587     boolean continueLaunchTickingLocked() {
    588         if (launchTickTime != 0) {
    589             Message msg = stack.mHandler.obtainMessage(ActivityStack.LAUNCH_TICK_MSG);
    590             msg.obj = this;
    591             stack.mHandler.removeMessages(ActivityStack.LAUNCH_TICK_MSG);
    592             stack.mHandler.sendMessageDelayed(msg, ActivityStack.LAUNCH_TICK);
    593             return true;
    594         }
    595         return false;
    596     }
    597 
    598     void finishLaunchTickingLocked() {
    599         launchTickTime = 0;
    600         stack.mHandler.removeMessages(ActivityStack.LAUNCH_TICK_MSG);
    601     }
    602 
    603     // IApplicationToken
    604 
    605     public boolean mayFreezeScreenLocked(ProcessRecord app) {
    606         // Only freeze the screen if this activity is currently attached to
    607         // an application, and that application is not blocked or unresponding.
    608         // In any other case, we can't count on getting the screen unfrozen,
    609         // so it is best to leave as-is.
    610         return app != null && !app.crashing && !app.notResponding;
    611     }
    612 
    613     public void startFreezingScreenLocked(ProcessRecord app, int configChanges) {
    614         if (mayFreezeScreenLocked(app)) {
    615             service.mWindowManager.startAppFreezingScreen(appToken, configChanges);
    616         }
    617     }
    618 
    619     public void stopFreezingScreenLocked(boolean force) {
    620         if (force || frozenBeforeDestroy) {
    621             frozenBeforeDestroy = false;
    622             service.mWindowManager.stopAppFreezingScreen(appToken, force);
    623         }
    624     }
    625 
    626     public void windowsDrawn() {
    627         synchronized(service) {
    628             if (launchTime != 0) {
    629                 final long curTime = SystemClock.uptimeMillis();
    630                 final long thisTime = curTime - launchTime;
    631                 final long totalTime = stack.mInitialStartTime != 0
    632                         ? (curTime - stack.mInitialStartTime) : thisTime;
    633                 if (ActivityManagerService.SHOW_ACTIVITY_START_TIME) {
    634                     EventLog.writeEvent(EventLogTags.ACTIVITY_LAUNCH_TIME,
    635                             System.identityHashCode(this), shortComponentName,
    636                             thisTime, totalTime);
    637                     StringBuilder sb = service.mStringBuilder;
    638                     sb.setLength(0);
    639                     sb.append("Displayed ");
    640                     sb.append(shortComponentName);
    641                     sb.append(": ");
    642                     TimeUtils.formatDuration(thisTime, sb);
    643                     if (thisTime != totalTime) {
    644                         sb.append(" (total ");
    645                         TimeUtils.formatDuration(totalTime, sb);
    646                         sb.append(")");
    647                     }
    648                     Log.i(ActivityManagerService.TAG, sb.toString());
    649                 }
    650                 stack.reportActivityLaunchedLocked(false, this, thisTime, totalTime);
    651                 if (totalTime > 0) {
    652                     service.mUsageStatsService.noteLaunchTime(realActivity, (int)totalTime);
    653                 }
    654                 launchTime = 0;
    655                 stack.mInitialStartTime = 0;
    656             }
    657             startTime = 0;
    658             finishLaunchTickingLocked();
    659         }
    660     }
    661 
    662     public void windowsVisible() {
    663         synchronized(service) {
    664             stack.reportActivityVisibleLocked(this);
    665             if (ActivityManagerService.DEBUG_SWITCH) Log.v(
    666                     ActivityManagerService.TAG, "windowsVisible(): " + this);
    667             if (!nowVisible) {
    668                 nowVisible = true;
    669                 lastVisibleTime = SystemClock.uptimeMillis();
    670                 if (!idle) {
    671                     // Instead of doing the full stop routine here, let's just
    672                     // hide any activities we now can, and let them stop when
    673                     // the normal idle happens.
    674                     stack.processStoppingActivitiesLocked(false);
    675                 } else {
    676                     // If this activity was already idle, then we now need to
    677                     // make sure we perform the full stop of any activities
    678                     // that are waiting to do so.  This is because we won't
    679                     // do that while they are still waiting for this one to
    680                     // become visible.
    681                     final int N = stack.mWaitingVisibleActivities.size();
    682                     if (N > 0) {
    683                         for (int i=0; i<N; i++) {
    684                             ActivityRecord r = (ActivityRecord)
    685                                 stack.mWaitingVisibleActivities.get(i);
    686                             r.waitingVisible = false;
    687                             if (ActivityManagerService.DEBUG_SWITCH) Log.v(
    688                                     ActivityManagerService.TAG,
    689                                     "Was waiting for visible: " + r);
    690                         }
    691                         stack.mWaitingVisibleActivities.clear();
    692                         Message msg = Message.obtain();
    693                         msg.what = ActivityStack.IDLE_NOW_MSG;
    694                         stack.mHandler.sendMessage(msg);
    695                     }
    696                 }
    697                 service.scheduleAppGcsLocked();
    698             }
    699         }
    700     }
    701 
    702     public void windowsGone() {
    703         if (ActivityManagerService.DEBUG_SWITCH) Log.v(
    704                 ActivityManagerService.TAG, "windowsGone(): " + this);
    705         nowVisible = false;
    706     }
    707 
    708     private ActivityRecord getWaitingHistoryRecordLocked() {
    709         // First find the real culprit...  if we are waiting
    710         // for another app to start, then we have paused dispatching
    711         // for this activity.
    712         ActivityRecord r = this;
    713         if (r.waitingVisible) {
    714             // Hmmm, who might we be waiting for?
    715             r = stack.mResumedActivity;
    716             if (r == null) {
    717                 r = stack.mPausingActivity;
    718             }
    719             // Both of those null?  Fall back to 'this' again
    720             if (r == null) {
    721                 r = this;
    722             }
    723         }
    724 
    725         return r;
    726     }
    727 
    728     public boolean keyDispatchingTimedOut() {
    729         ActivityRecord r;
    730         ProcessRecord anrApp = null;
    731         synchronized(service) {
    732             r = getWaitingHistoryRecordLocked();
    733             if (r != null && r.app != null) {
    734                 if (r.app.debugging) {
    735                     return false;
    736                 }
    737 
    738                 if (service.mDidDexOpt) {
    739                     // Give more time since we were dexopting.
    740                     service.mDidDexOpt = false;
    741                     return false;
    742                 }
    743 
    744                 if (r.app.instrumentationClass == null) {
    745                     anrApp = r.app;
    746                 } else {
    747                     Bundle info = new Bundle();
    748                     info.putString("shortMsg", "keyDispatchingTimedOut");
    749                     info.putString("longMsg", "Timed out while dispatching key event");
    750                     service.finishInstrumentationLocked(
    751                             r.app, Activity.RESULT_CANCELED, info);
    752                 }
    753             }
    754         }
    755 
    756         if (anrApp != null) {
    757             service.appNotResponding(anrApp, r, this,
    758                     "keyDispatchingTimedOut");
    759         }
    760 
    761         return true;
    762     }
    763 
    764     /** Returns the key dispatching timeout for this application token. */
    765     public long getKeyDispatchingTimeout() {
    766         synchronized(service) {
    767             ActivityRecord r = getWaitingHistoryRecordLocked();
    768             if (r != null && r.app != null
    769                     && (r.app.instrumentationClass != null || r.app.usingWrapper)) {
    770                 return ActivityManagerService.INSTRUMENTATION_KEY_DISPATCHING_TIMEOUT;
    771             }
    772 
    773             return ActivityManagerService.KEY_DISPATCHING_TIMEOUT;
    774         }
    775     }
    776 
    777     /**
    778      * This method will return true if the activity is either visible, is becoming visible, is
    779      * currently pausing, or is resumed.
    780      */
    781     public boolean isInterestingToUserLocked() {
    782         return visible || nowVisible || state == ActivityState.PAUSING ||
    783                 state == ActivityState.RESUMED;
    784     }
    785 
    786     public void setSleeping(boolean _sleeping) {
    787         if (sleeping == _sleeping) {
    788             return;
    789         }
    790         if (app != null && app.thread != null) {
    791             try {
    792                 app.thread.scheduleSleeping(appToken, _sleeping);
    793                 if (sleeping && !stack.mGoingToSleepActivities.contains(this)) {
    794                     stack.mGoingToSleepActivities.add(this);
    795                 }
    796                 sleeping = _sleeping;
    797             } catch (RemoteException e) {
    798                 Slog.w(ActivityStack.TAG, "Exception thrown when sleeping: "
    799                         + intent.getComponent(), e);
    800             }
    801         }
    802     }
    803 
    804     public String toString() {
    805         if (stringName != null) {
    806             return stringName;
    807         }
    808         StringBuilder sb = new StringBuilder(128);
    809         sb.append("ActivityRecord{");
    810         sb.append(Integer.toHexString(System.identityHashCode(this)));
    811         sb.append(' ');
    812         sb.append(intent.getComponent().flattenToShortString());
    813         sb.append('}');
    814         return stringName = sb.toString();
    815     }
    816 }
    817