/*
* Copyright (C) 2010 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 com.android.server.am;
import com.android.internal.app.HeavyWeightSwitcherActivity;
import com.android.internal.os.BatteryStatsImpl;
import com.android.server.am.ActivityManagerService.PendingActivityLaunch;
import android.app.Activity;
import android.app.AppGlobals;
import android.app.IActivityManager;
import static android.app.IActivityManager.START_CLASS_NOT_FOUND;
import static android.app.IActivityManager.START_DELIVERED_TO_TOP;
import static android.app.IActivityManager.START_FORWARD_AND_REQUEST_CONFLICT;
import static android.app.IActivityManager.START_INTENT_NOT_RESOLVED;
import static android.app.IActivityManager.START_PERMISSION_DENIED;
import static android.app.IActivityManager.START_RETURN_INTENT_TO_CALLER;
import static android.app.IActivityManager.START_SUCCESS;
import static android.app.IActivityManager.START_SWITCHES_CANCELED;
import static android.app.IActivityManager.START_TASK_TO_FRONT;
import android.app.IApplicationThread;
import android.app.PendingIntent;
import android.app.ResultInfo;
import android.app.IActivityManager.WaitResult;
import android.content.ComponentName;
import android.content.Context;
import android.content.IIntentSender;
import android.content.Intent;
import android.content.IntentSender;
import android.content.pm.ActivityInfo;
import android.content.pm.ApplicationInfo;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;
import android.content.res.Configuration;
import android.net.Uri;
import android.os.Binder;
import android.os.Bundle;
import android.os.Handler;
import android.os.IBinder;
import android.os.Message;
import android.os.PowerManager;
import android.os.RemoteException;
import android.os.SystemClock;
import android.util.EventLog;
import android.util.Log;
import android.util.Slog;
import android.view.WindowManagerPolicy;
import java.lang.ref.WeakReference;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
/**
* State and management of a single stack of activities.
*/
public class ActivityStack {
static final String TAG = ActivityManagerService.TAG;
static final boolean localLOGV = ActivityManagerService.localLOGV;
static final boolean DEBUG_SWITCH = ActivityManagerService.DEBUG_SWITCH;
static final boolean DEBUG_PAUSE = ActivityManagerService.DEBUG_PAUSE;
static final boolean DEBUG_VISBILITY = ActivityManagerService.DEBUG_VISBILITY;
static final boolean DEBUG_USER_LEAVING = ActivityManagerService.DEBUG_USER_LEAVING;
static final boolean DEBUG_TRANSITION = ActivityManagerService.DEBUG_TRANSITION;
static final boolean DEBUG_RESULTS = ActivityManagerService.DEBUG_RESULTS;
static final boolean DEBUG_CONFIGURATION = ActivityManagerService.DEBUG_CONFIGURATION;
static final boolean DEBUG_TASKS = ActivityManagerService.DEBUG_TASKS;
static final boolean VALIDATE_TOKENS = ActivityManagerService.VALIDATE_TOKENS;
// How long we wait until giving up on the last activity telling us it
// is idle.
static final int IDLE_TIMEOUT = 10*1000;
// How long we wait until giving up on the last activity to pause. This
// is short because it directly impacts the responsiveness of starting the
// next activity.
static final int PAUSE_TIMEOUT = 500;
// How long we can hold the launch wake lock before giving up.
static final int LAUNCH_TIMEOUT = 10*1000;
// How long we wait until giving up on an activity telling us it has
// finished destroying itself.
static final int DESTROY_TIMEOUT = 10*1000;
// How long until we reset a task when the user returns to it. Currently
// 30 minutes.
static final long ACTIVITY_INACTIVE_RESET_TIME = 1000*60*30;
// How long between activity launches that we consider safe to not warn
// the user about an unexpected activity being launched on top.
static final long START_WARN_TIME = 5*1000;
// Set to false to disable the preview that is shown while a new activity
// is being started.
static final boolean SHOW_APP_STARTING_PREVIEW = true;
enum ActivityState {
INITIALIZING,
RESUMED,
PAUSING,
PAUSED,
STOPPING,
STOPPED,
FINISHING,
DESTROYING,
DESTROYED
}
final ActivityManagerService mService;
final boolean mMainStack;
final Context mContext;
/**
* The back history of all previous (and possibly still
* running) activities. It contains HistoryRecord objects.
*/
final ArrayList mHistory = new ArrayList();
/**
* List of running activities, sorted by recent usage.
* The first entry in the list is the least recently used.
* It contains HistoryRecord objects.
*/
final ArrayList mLRUActivities = new ArrayList();
/**
* List of activities that are waiting for a new activity
* to become visible before completing whatever operation they are
* supposed to do.
*/
final ArrayList<ActivityRecord> mWaitingVisibleActivities
= new ArrayList<ActivityRecord>();
/**
* List of activities that are ready to be stopped, but waiting
* for the next activity to settle down before doing so. It contains
* HistoryRecord objects.
*/
final ArrayList<ActivityRecord> mStoppingActivities
= new ArrayList<ActivityRecord>();
/**
* Animations that for the current transition have requested not to
* be considered for the transition animation.
*/
final ArrayList<ActivityRecord> mNoAnimActivities
= new ArrayList<ActivityRecord>();
/**
* List of activities that are ready to be finished, but waiting
* for the previous activity to settle down before doing so. It contains
* HistoryRecord objects.
*/
final ArrayList<ActivityRecord> mFinishingActivities
= new ArrayList<ActivityRecord>();
/**
* List of people waiting to find out about the next launched activity.
*/
final ArrayList<IActivityManager.WaitResult> mWaitingActivityLaunched
= new ArrayList<IActivityManager.WaitResult>();
/**
* List of people waiting to find out about the next visible activity.
*/
final ArrayList<IActivityManager.WaitResult> mWaitingActivityVisible
= new ArrayList<IActivityManager.WaitResult>();
/**
* Set when the system is going to sleep, until we have
* successfully paused the current activity and released our wake lock.
* At that point the system is allowed to actually sleep.
*/
final PowerManager.WakeLock mGoingToSleep;
/**
* We don't want to allow the device to go to sleep while in the process
* of launching an activity. This is primarily to allow alarm intent
* receivers to launch an activity and get that to run before the device
* goes back to sleep.
*/
final PowerManager.WakeLock mLaunchingActivity;
/**
* When we are in the process of pausing an activity, before starting the
* next one, this variable holds the activity that is currently being paused.
*/
ActivityRecord mPausingActivity = null;
/**
* This is the last activity that we put into the paused state. This is
* used to determine if we need to do an activity transition while sleeping,
* when we normally hold the top activity paused.
*/
ActivityRecord mLastPausedActivity = null;
/**
* Current activity that is resumed, or null if there is none.
*/
ActivityRecord mResumedActivity = null;
/**
* This is the last activity that has been started. It is only used to
* identify when multiple activities are started at once so that the user
* can be warned they may not be in the activity they think they are.
*/
ActivityRecord mLastStartedActivity = null;
/**
* Set when we know we are going to be calling updateConfiguration()
* soon, so want to skip intermediate config checks.
*/
boolean mConfigWillChange;
/**
* Set to indicate whether to issue an onUserLeaving callback when a
* newly launched activity is being brought in front of us.
*/
boolean mUserLeaving = false;
long mInitialStartTime = 0;
static final int PAUSE_TIMEOUT_MSG = 9;
static final int IDLE_TIMEOUT_MSG = 10;
static final int IDLE_NOW_MSG = 11;
static final int LAUNCH_TIMEOUT_MSG = 16;
static final int DESTROY_TIMEOUT_MSG = 17;
static final int RESUME_TOP_ACTIVITY_MSG = 19;
final Handler mHandler = new Handler() {
//public Handler() {
// if (localLOGV) Slog.v(TAG, "Handler started!");
//}
public void handleMessage(Message msg) {
switch (msg.what) {
case PAUSE_TIMEOUT_MSG: {
IBinder token = (IBinder)msg.obj;
// We don't at this point know if the activity is fullscreen,
// so we need to be conservative and assume it isn't.
Slog.w(TAG, "Activity pause timeout for " + token);
activityPaused(token, null, true);
} break;
case IDLE_TIMEOUT_MSG: {
if (mService.mDidDexOpt) {
mService.mDidDexOpt = false;
Message nmsg = mHandler.obtainMessage(IDLE_TIMEOUT_MSG);
nmsg.obj = msg.obj;
mHandler.sendMessageDelayed(nmsg, IDLE_TIMEOUT);
return;
}
// We don't at this point know if the activity is fullscreen,
// so we need to be conservative and assume it isn't.
IBinder token = (IBinder)msg.obj;
Slog.w(TAG, "Activity idle timeout for " + token);
activityIdleInternal(token, true, null);
} break;
case DESTROY_TIMEOUT_MSG: {
IBinder token = (IBinder)msg.obj;
// We don't at this point know if the activity is fullscreen,
// so we need to be conservative and assume it isn't.
Slog.w(TAG, "Activity destroy timeout for " + token);
activityDestroyed(token);
} break;
case IDLE_NOW_MSG: {
IBinder token = (IBinder)msg.obj;
activityIdleInternal(token, false, null);
} break;
case LAUNCH_TIMEOUT_MSG: {
if (mService.mDidDexOpt) {
mService.mDidDexOpt = false;
Message nmsg = mHandler.obtainMessage(LAUNCH_TIMEOUT_MSG);
mHandler.sendMessageDelayed(nmsg, LAUNCH_TIMEOUT);
return;
}
synchronized (mService) {
if (mLaunchingActivity.isHeld()) {
Slog.w(TAG, "Launch timeout has expired, giving up wake lock!");
mLaunchingActivity.release();
}
}
} break;
case RESUME_TOP_ACTIVITY_MSG: {
synchronized (mService) {
resumeTopActivityLocked(null);
}
} break;
}
}
};
ActivityStack(ActivityManagerService service, Context context, boolean mainStack) {
mService = service;
mContext = context;
mMainStack = mainStack;
PowerManager pm =
(PowerManager)context.getSystemService(Context.POWER_SERVICE);
mGoingToSleep = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "ActivityManager-Sleep");
mLaunchingActivity = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "ActivityManager-Launch");
mLaunchingActivity.setReferenceCounted(false);
}
final ActivityRecord topRunningActivityLocked(ActivityRecord notTop) {
int i = mHistory.size()-1;
while (i >= 0) {
ActivityRecord r = (ActivityRecord)mHistory.get(i);
if (!r.finishing && r != notTop) {
return r;
}
i--;
}
return null;
}
final ActivityRecord topRunningNonDelayedActivityLocked(ActivityRecord notTop) {
int i = mHistory.size()-1;
while (i >= 0) {
ActivityRecord r = (ActivityRecord)mHistory.get(i);
if (!r.finishing && !r.delayedResume && r != notTop) {
return r;
}
i--;
}
return null;
}
/**
* This is a simplified version of topRunningActivityLocked that provides a number of
* optional skip-over modes. It is intended for use with the ActivityController hook only.
*
* @param token If non-null, any history records matching this token will be skipped.
* @param taskId If non-zero, we'll attempt to skip over records with the same task ID.
*
* @return Returns the HistoryRecord of the next activity on the stack.
*/
final ActivityRecord topRunningActivityLocked(IBinder token, int taskId) {
int i = mHistory.size()-1;
while (i >= 0) {
ActivityRecord r = (ActivityRecord)mHistory.get(i);
// Note: the taskId check depends on real taskId fields being non-zero
if (!r.finishing && (token != r) && (taskId != r.task.taskId)) {
return r;
}
i--;
}
return null;
}
final int indexOfTokenLocked(IBinder token) {
int count = mHistory.size();
// convert the token to an entry in the history.
int index = -1;
for (int i=count-1; i>=0; i--) {
Object o = mHistory.get(i);
if (o == token) {
index = i;
break;
}
}
return index;
}
private final boolean updateLRUListLocked(ActivityRecord r) {
final boolean hadit = mLRUActivities.remove(r);
mLRUActivities.add(r);
return hadit;
}
/**
* Returns the top activity in any existing task matching the given
* Intent. Returns null if no such task is found.
*/
private ActivityRecord findTaskLocked(Intent intent, ActivityInfo info) {
ComponentName cls = intent.getComponent();
if (info.targetActivity != null) {
cls = new ComponentName(info.packageName, info.targetActivity);
}
TaskRecord cp = null;
final int N = mHistory.size();
for (int i=(N-1); i>=0; i--) {
ActivityRecord r = (ActivityRecord)mHistory.get(i);
if (!r.finishing && r.task != cp
&& r.launchMode != ActivityInfo.LAUNCH_SINGLE_INSTANCE) {
cp = r.task;
//Slog.i(TAG, "Comparing existing cls=" + r.task.intent.getComponent().flattenToShortString()
// + "/aff=" + r.task.affinity + " to new cls="
// + intent.getComponent().flattenToShortString() + "/aff=" + taskAffinity);
if (r.task.affinity != null) {
if (r.task.affinity.equals(info.taskAffinity)) {
//Slog.i(TAG, "Found matching affinity!");
return r;
}
} else if (r.task.intent != null
&& r.task.intent.getComponent().equals(cls)) {
//Slog.i(TAG, "Found matching class!");
//dump();
//Slog.i(TAG, "For Intent " + intent + " bringing to top: " + r.intent);
return r;
} else if (r.task.affinityIntent != null
&& r.task.affinityIntent.getComponent().equals(cls)) {
//Slog.i(TAG, "Found matching class!");
//dump();
//Slog.i(TAG, "For Intent " + intent + " bringing to top: " + r.intent);
return r;
}
}
}
return null;
}
/**
* Returns the first activity (starting from the top of the stack) that
* is the same as the given activity. Returns null if no such activity
* is found.
*/
private ActivityRecord findActivityLocked(Intent intent, ActivityInfo info) {
ComponentName cls = intent.getComponent();
if (info.targetActivity != null) {
cls = new ComponentName(info.packageName, info.targetActivity);
}
final int N = mHistory.size();
for (int i=(N-1); i>=0; i--) {
ActivityRecord r = (ActivityRecord)mHistory.get(i);
if (!r.finishing) {
if (r.intent.getComponent().equals(cls)) {
//Slog.i(TAG, "Found matching class!");
//dump();
//Slog.i(TAG, "For Intent " + intent + " bringing to top: " + r.intent);
return r;
}
}
}
return null;
}
final boolean realStartActivityLocked(ActivityRecord r,
ProcessRecord app, boolean andResume, boolean checkConfig)
throws RemoteException {
r.startFreezingScreenLocked(app, 0);
mService.mWindowManager.setAppVisibility(r, true);
// Have the window manager re-evaluate the orientation of
// the screen based on the new activity order. Note that
// as a result of this, it can call back into the activity
// manager with a new orientation. We don't care about that,
// because the activity is not currently running so we are
// just restarting it anyway.
if (checkConfig) {
Configuration config = mService.mWindowManager.updateOrientationFromAppTokens(
mService.mConfiguration,
r.mayFreezeScreenLocked(app) ? r : null);
mService.updateConfigurationLocked(config, r);
}
r.app = app;
if (localLOGV) Slog.v(TAG, "Launching: " + r);
int idx = app.activities.indexOf(r);
if (idx < 0) {
app.activities.add(r);
}
mService.updateLruProcessLocked(app, true, true);
try {
if (app.thread == null) {
throw new RemoteException();
}
List<ResultInfo> results = null;
List<Intent> newIntents = null;
if (andResume) {
results = r.results;
newIntents = r.newIntents;
}
if (DEBUG_SWITCH) Slog.v(TAG, "Launching: " + r
+ " icicle=" + r.icicle
+ " with results=" + results + " newIntents=" + newIntents
+ " andResume=" + andResume);
if (andResume) {
EventLog.writeEvent(EventLogTags.AM_RESTART_ACTIVITY,
System.identityHashCode(r),
r.task.taskId, r.shortComponentName);
}
if (r.isHomeActivity) {
mService.mHomeProcess = app;
}
mService.ensurePackageDexOpt(r.intent.getComponent().getPackageName());
app.thread.scheduleLaunchActivity(new Intent(r.intent), r,
System.identityHashCode(r),
r.info, r.icicle, results, newIntents, !andResume,
mService.isNextTransitionForward());
if ((app.info.flags&ApplicationInfo.FLAG_CANT_SAVE_STATE) != 0) {
// This may be a heavy-weight process! Note that the package
// manager will ensure that only activity can run in the main
// process of the .apk, which is the only thing that will be
// considered heavy-weight.
if (app.processName.equals(app.info.packageName)) {
if (mService.mHeavyWeightProcess != null
&& mService.mHeavyWeightProcess != app) {
Log.w(TAG, "Starting new heavy weight process " + app
+ " when already running "
+ mService.mHeavyWeightProcess);
}
mService.mHeavyWeightProcess = app;
Message msg = mService.mHandler.obtainMessage(
ActivityManagerService.POST_HEAVY_NOTIFICATION_MSG);
msg.obj = r;
mService.mHandler.sendMessage(msg);
}
}
} catch (RemoteException e) {
if (r.launchFailed) {
// This is the second time we failed -- finish activity
// and give up.
Slog.e(TAG, "Second failure launching "
+ r.intent.getComponent().flattenToShortString()
+ ", giving up", e);
mService.appDiedLocked(app, app.pid, app.thread);
requestFinishActivityLocked(r, Activity.RESULT_CANCELED, null,
"2nd-crash");
return false;
}
// This is the first time we failed -- restart process and
// retry.
app.activities.remove(r);
throw e;
}
r.launchFailed = false;
if (updateLRUListLocked(r)) {
Slog.w(TAG, "Activity " + r
+ " being launched, but already in LRU list");
}
if (andResume) {
// As part of the process of launching, ActivityThread also performs
// a resume.
r.state = ActivityState.RESUMED;
r.icicle = null;
r.haveState = false;
r.stopped = false;
mResumedActivity = r;
r.task.touchActiveTime();
completeResumeLocked(r);
pauseIfSleepingLocked();
} else {
// This activity is not starting in the resumed state... which
// should look like we asked it to pause+stop (but remain visible),
// and it has done so and reported back the current icicle and
// other state.
r.state = ActivityState.STOPPED;
r.stopped = true;
}
// Launch the new version setup screen if needed. We do this -after-
// launching the initial activity (that is, home), so that it can have
// a chance to initialize itself while in the background, making the
// switch back to it faster and look better.
if (mMainStack) {
mService.startSetupActivityLocked();
}
return true;
}
private final void startSpecificActivityLocked(ActivityRecord r,
boolean andResume, boolean checkConfig) {
// Is this activity's application already running?
ProcessRecord app = mService.getProcessRecordLocked(r.processName,
r.info.applicationInfo.uid);
if (r.launchTime == 0) {
r.launchTime = SystemClock.uptimeMillis();
if (mInitialStartTime == 0) {
mInitialStartTime = r.launchTime;
}
} else if (mInitialStartTime == 0) {
mInitialStartTime = SystemClock.uptimeMillis();
}
if (app != null && app.thread != null) {
try {
realStartActivityLocked(r, app, andResume, checkConfig);
return;
} catch (RemoteException e) {
Slog.w(TAG, "Exception when starting activity "
+ r.intent.getComponent().flattenToShortString(), e);
}
// If a dead object exception was thrown -- fall through to
// restart the application.
}
mService.startProcessLocked(r.processName, r.info.applicationInfo, true, 0,
"activity", r.intent.getComponent(), false);
}
void pauseIfSleepingLocked() {
if (mService.mSleeping || mService.mShuttingDown) {
if (!mGoingToSleep.isHeld()) {
mGoingToSleep.acquire();
if (mLaunchingActivity.isHeld()) {
mLaunchingActivity.release();
mService.mHandler.removeMessages(LAUNCH_TIMEOUT_MSG);
}
}
// If we are not currently pausing an activity, get the current
// one to pause. If we are pausing one, we will just let that stuff
// run and release the wake lock when all done.
if (mPausingActivity == null) {
if (DEBUG_PAUSE) Slog.v(TAG, "Sleep needs to pause...");
if (DEBUG_USER_LEAVING) Slog.v(TAG, "Sleep => pause with userLeaving=false");
startPausingLocked(false, true);
}
}
}
private final void startPausingLocked(boolean userLeaving, boolean uiSleeping) {
if (mPausingActivity != null) {
RuntimeException e = new RuntimeException();
Slog.e(TAG, "Trying to pause when pause is already pending for "
+ mPausingActivity, e);
}
ActivityRecord prev = mResumedActivity;
if (prev == null) {
RuntimeException e = new RuntimeException();
Slog.e(TAG, "Trying to pause when nothing is resumed", e);
resumeTopActivityLocked(null);
return;
}
if (DEBUG_PAUSE) Slog.v(TAG, "Start pausing: " + prev);
mResumedActivity = null;
mPausingActivity = prev;
mLastPausedActivity = prev;
prev.state = ActivityState.PAUSING;
prev.task.touchActiveTime();
mService.updateCpuStats();
if (prev.app != null && prev.app.thread != null) {
if (DEBUG_PAUSE) Slog.v(TAG, "Enqueueing pending pause: " + prev);
try {
EventLog.writeEvent(EventLogTags.AM_PAUSE_ACTIVITY,
System.identityHashCode(prev),
prev.shortComponentName);
prev.app.thread.schedulePauseActivity(prev, prev.finishing, userLeaving,
prev.configChangeFlags);
if (mMainStack) {
mService.updateUsageStats(prev, false);
}
} catch (Exception e) {
// Ignore exception, if process died other code will cleanup.
Slog.w(TAG, "Exception thrown during pause", e);
mPausingActivity = null;
mLastPausedActivity = null;
}
} else {
mPausingActivity = null;
mLastPausedActivity = null;
}
// If we are not going to sleep, we want to ensure the device is
// awake until the next activity is started.
if (!mService.mSleeping && !mService.mShuttingDown) {
mLaunchingActivity.acquire();
if (!mHandler.hasMessages(LAUNCH_TIMEOUT_MSG)) {
// To be safe, don't allow the wake lock to be held for too long.
Message msg = mHandler.obtainMessage(LAUNCH_TIMEOUT_MSG);
mHandler.sendMessageDelayed(msg, LAUNCH_TIMEOUT);
}
}
if (mPausingActivity != null) {
// Have the window manager pause its key dispatching until the new
// activity has started. If we're pausing the activity just because
// the screen is being turned off and the UI is sleeping, don't interrupt
// key dispatch; the same activity will pick it up again on wakeup.
if (!uiSleeping) {
prev.pauseKeyDispatchingLocked();
} else {
if (DEBUG_PAUSE) Slog.v(TAG, "Key dispatch not paused for screen off");
}
// Schedule a pause timeout in case the app doesn't respond.
// We don't give it much time because this directly impacts the
// responsiveness seen by the user.
Message msg = mHandler.obtainMessage(PAUSE_TIMEOUT_MSG);
msg.obj = prev;
mHandler.sendMessageDelayed(msg, PAUSE_TIMEOUT);
if (DEBUG_PAUSE) Slog.v(TAG, "Waiting for pause to complete...");
} else {
// This activity failed to schedule the
// pause, so just treat it as being paused now.
if (DEBUG_PAUSE) Slog.v(TAG, "Activity not running, resuming next.");
resumeTopActivityLocked(null);
}
}
final void activityPaused(IBinder token, Bundle icicle, boolean timeout) {
if (DEBUG_PAUSE) Slog.v(
TAG, "Activity paused: token=" + token + ", icicle=" + icicle
+ ", timeout=" + timeout);
ActivityRecord r = null;
synchronized (mService) {
int index = indexOfTokenLocked(token);
if (index >= 0) {
r = (ActivityRecord)mHistory.get(index);
if (!timeout) {
r.icicle = icicle;
r.haveState = true;
}
mHandler.removeMessages(PAUSE_TIMEOUT_MSG, r);
if (mPausingActivity == r) {
r.state = ActivityState.PAUSED;
completePauseLocked();
} else {
EventLog.writeEvent(EventLogTags.AM_FAILED_TO_PAUSE,
System.identityHashCode(r), r.shortComponentName,
mPausingActivity != null
? mPausingActivity.shortComponentName : "(none)");
}
}
}
}
private final void completePauseLocked() {
ActivityRecord prev = mPausingActivity;
if (DEBUG_PAUSE) Slog.v(TAG, "Complete pause: " + prev);
if (prev != null) {
if (prev.finishing) {
if (DEBUG_PAUSE) Slog.v(TAG, "Executing finish of activity: " + prev);
prev = finishCurrentActivityLocked(prev, FINISH_AFTER_VISIBLE);
} else if (prev.app != null) {
if (DEBUG_PAUSE) Slog.v(TAG, "Enqueueing pending stop: " + prev);
if (prev.waitingVisible) {
prev.waitingVisible = false;
mWaitingVisibleActivities.remove(prev);
if (DEBUG_SWITCH || DEBUG_PAUSE) Slog.v(
TAG, "Complete pause, no longer waiting: " + prev);
}
if (prev.configDestroy) {
// The previous is being paused because the configuration
// is changing, which means it is actually stopping...
// To juggle the fact that we are also starting a new
// instance right now, we need to first completely stop
// the current instance before starting the new one.
if (DEBUG_PAUSE) Slog.v(TAG, "Destroying after pause: " + prev);
destroyActivityLocked(prev, true);
} else {
mStoppingActivities.add(prev);
if (mStoppingActivities.size() > 3) {
// If we already have a few activities waiting to stop,
// then give up on things going idle and start clearing
// them out.
if (DEBUG_PAUSE) Slog.v(TAG, "To many pending stops, forcing idle");
Message msg = Message.obtain();
msg.what = IDLE_NOW_MSG;
mHandler.sendMessage(msg);
}
}
} else {
if (DEBUG_PAUSE) Slog.v(TAG, "App died during pause, not stopping: " + prev);
prev = null;
}
mPausingActivity = null;
}
if (!mService.mSleeping && !mService.mShuttingDown) {
resumeTopActivityLocked(prev);
} else {
if (mGoingToSleep.isHeld()) {
mGoingToSleep.release();
}
if (mService.mShuttingDown) {
mService.notifyAll();
}
}
if (prev != null) {
prev.resumeKeyDispatchingLocked();
}
if (prev.app != null && prev.cpuTimeAtResume > 0
&& mService.mBatteryStatsService.isOnBattery()) {
long diff = 0;
synchronized (mService.mProcessStatsThread) {
diff = mService.mProcessStats.getCpuTimeForPid(prev.app.pid)
- prev.cpuTimeAtResume;
}
if (diff > 0) {
BatteryStatsImpl bsi = mService.mBatteryStatsService.getActiveStatistics();
synchronized (bsi) {
BatteryStatsImpl.Uid.Proc ps =
bsi.getProcessStatsLocked(prev.info.applicationInfo.uid,
prev.info.packageName);
if (ps != null) {
ps.addForegroundTimeLocked(diff);
}
}
}
}
prev.cpuTimeAtResume = 0; // reset it
}
/**
* Once we know that we have asked an application to put an activity in
* the resumed state (either by launching it or explicitly telling it),
* this function updates the rest of our state to match that fact.
*/
private final void completeResumeLocked(ActivityRecord next) {
next.idle = false;
next.results = null;
next.newIntents = null;
// schedule an idle timeout in case the app doesn't do it for us.
Message msg = mHandler.obtainMessage(IDLE_TIMEOUT_MSG);
msg.obj = next;
mHandler.sendMessageDelayed(msg, IDLE_TIMEOUT);
if (false) {
// The activity was never told to pause, so just keep
// things going as-is. To maintain our own state,
// we need to emulate it coming back and saying it is
// idle.
msg = mHandler.obtainMessage(IDLE_NOW_MSG);
msg.obj = next;
mHandler.sendMessage(msg);
}
if (mMainStack) {
mService.reportResumedActivityLocked(next);
}
next.thumbnail = null;
if (mMainStack) {
mService.setFocusedActivityLocked(next);
}
next.resumeKeyDispatchingLocked();
ensureActivitiesVisibleLocked(null, 0);
mService.mWindowManager.executeAppTransition();
mNoAnimActivities.clear();
// Mark the point when the activity is resuming
// TODO: To be more accurate, the mark should be before the onCreate,
// not after the onResume. But for subsequent starts, onResume is fine.
if (next.app != null) {
synchronized (mService.mProcessStatsThread) {
next.cpuTimeAtResume = mService.mProcessStats.getCpuTimeForPid(next.app.pid);
}
} else {
next.cpuTimeAtResume = 0; // Couldn't get the cpu time of process
}
}
/**
* Make sure that all activities that need to be visible (that is, they
* currently can be seen by the user) actually are.
*/
final void ensureActivitiesVisibleLocked(ActivityRecord top,
ActivityRecord starting, String onlyThisProcess, int configChanges) {
if (DEBUG_VISBILITY) Slog.v(
TAG, "ensureActivitiesVisible behind " + top
+ " configChanges=0x" + Integer.toHexString(configChanges));
// If the top activity is not fullscreen, then we need to
// make sure any activities under it are now visible.
final int count = mHistory.size();
int i = count-1;
while (mHistory.get(i) != top) {
i--;
}
ActivityRecord r;
boolean behindFullscreen = false;
for (; i>=0; i--) {
r = (ActivityRecord)mHistory.get(i);
if (DEBUG_VISBILITY) Slog.v(
TAG, "Make visible? " + r + " finishing=" + r.finishing
+ " state=" + r.state);
if (r.finishing) {
continue;
}
final boolean doThisProcess = onlyThisProcess == null
|| onlyThisProcess.equals(r.processName);
// First: if this is not the current activity being started, make
// sure it matches the current configuration.
if (r != starting && doThisProcess) {
ensureActivityConfigurationLocked(r, 0);
}
if (r.app == null || r.app.thread == null) {
if (onlyThisProcess == null
|| onlyThisProcess.equals(r.processName)) {
// This activity needs to be visible, but isn't even
// running... get it started, but don't resume it
// at this point.
if (DEBUG_VISBILITY) Slog.v(
TAG, "Start and freeze screen for " + r);
if (r != starting) {
r.startFreezingScreenLocked(r.app, configChanges);
}
if (!r.visible) {
if (DEBUG_VISBILITY) Slog.v(
TAG, "Starting and making visible: " + r);
mService.mWindowManager.setAppVisibility(r, true);
}
if (r != starting) {
startSpecificActivityLocked(r, false, false);
}
}
} else if (r.visible) {
// If this activity is already visible, then there is nothing
// else to do here.
if (DEBUG_VISBILITY) Slog.v(
TAG, "Skipping: already visible at " + r);
r.stopFreezingScreenLocked(false);
} else if (onlyThisProcess == null) {
// This activity is not currently visible, but is running.
// Tell it to become visible.
r.visible = true;
if (r.state != ActivityState.RESUMED && r != starting) {
// If this activity is paused, tell it
// to now show its window.
if (DEBUG_VISBILITY) Slog.v(
TAG, "Making visible and scheduling visibility: " + r);
try {
mService.mWindowManager.setAppVisibility(r, true);
r.app.thread.scheduleWindowVisibility(r, true);
r.stopFreezingScreenLocked(false);
} catch (Exception e) {
// Just skip on any failure; we'll make it
// visible when it next restarts.
Slog.w(TAG, "Exception thrown making visibile: "
+ r.intent.getComponent(), e);
}
}
}
// Aggregate current change flags.
configChanges |= r.configChangeFlags;
if (r.fullscreen) {
// At this point, nothing else needs to be shown
if (DEBUG_VISBILITY) Slog.v(
TAG, "Stopping: fullscreen at " + r);
behindFullscreen = true;
i--;
break;
}
}
// Now for any activities that aren't visible to the user, make
// sure they no longer are keeping the screen frozen.
while (i >= 0) {
r = (ActivityRecord)mHistory.get(i);
if (DEBUG_VISBILITY) Slog.v(
TAG, "Make invisible? " + r + " finishing=" + r.finishing
+ " state=" + r.state
+ " behindFullscreen=" + behindFullscreen);
if (!r.finishing) {
if (behindFullscreen) {
if (r.visible) {
if (DEBUG_VISBILITY) Slog.v(
TAG, "Making invisible: " + r);
r.visible = false;
try {
mService.mWindowManager.setAppVisibility(r, false);
if ((r.state == ActivityState.STOPPING
|| r.state == ActivityState.STOPPED)
&& r.app != null && r.app.thread != null) {
if (DEBUG_VISBILITY) Slog.v(
TAG, "Scheduling invisibility: " + r);
r.app.thread.scheduleWindowVisibility(r, false);
}
} catch (Exception e) {
// Just skip on any failure; we'll make it
// visible when it next restarts.
Slog.w(TAG, "Exception thrown making hidden: "
+ r.intent.getComponent(), e);
}
} else {
if (DEBUG_VISBILITY) Slog.v(
TAG, "Already invisible: " + r);
}
} else if (r.fullscreen) {
if (DEBUG_VISBILITY) Slog.v(
TAG, "Now behindFullscreen: " + r);
behindFullscreen = true;
}
}
i--;
}
}
/**
* Version of ensureActivitiesVisible that can easily be called anywhere.
*/
final void ensureActivitiesVisibleLocked(ActivityRecord starting,
int configChanges) {
ActivityRecord r = topRunningActivityLocked(null);
if (r != null) {
ensureActivitiesVisibleLocked(r, starting, null, configChanges);
}
}
/**
* Ensure that the top activity in the stack is resumed.
*
* @param prev The previously resumed activity, for when in the process
* of pausing; can be null to call from elsewhere.
*
* @return Returns true if something is being resumed, or false if
* nothing happened.
*/
final boolean resumeTopActivityLocked(ActivityRecord prev) {
// Find the first activity that is not finishing.
ActivityRecord next = topRunningActivityLocked(null);
// Remember how we'll process this pause/resume situation, and ensure
// that the state is reset however we wind up proceeding.
final boolean userLeaving = mUserLeaving;
mUserLeaving = false;
if (next == null) {
// There are no more activities! Let's just start up the
// Launcher...
if (mMainStack) {
return mService.startHomeActivityLocked();
}
}
next.delayedResume = false;
// If the top activity is the resumed one, nothing to do.
if (mResumedActivity == next && next.state == ActivityState.RESUMED) {
// Make sure we have executed any pending transitions, since there
// should be nothing left to do at this point.
mService.mWindowManager.executeAppTransition();
mNoAnimActivities.clear();
return false;
}
// If we are sleeping, and there is no resumed activity, and the top
// activity is paused, well that is the state we want.
if ((mService.mSleeping || mService.mShuttingDown)
&& mLastPausedActivity == next && next.state == ActivityState.PAUSED) {
// Make sure we have executed any pending transitions, since there
// should be nothing left to do at this point.
mService.mWindowManager.executeAppTransition();
mNoAnimActivities.clear();
return false;
}
// The activity may be waiting for stop, but that is no longer
// appropriate for it.
mStoppingActivities.remove(next);
mWaitingVisibleActivities.remove(next);
if (DEBUG_SWITCH) Slog.v(TAG, "Resuming " + next);
// If we are currently pausing an activity, then don't do anything
// until that is done.
if (mPausingActivity != null) {
if (DEBUG_SWITCH) Slog.v(TAG, "Skip resume: pausing=" + mPausingActivity);
return false;
}
// Okay we are now going to start a switch, to 'next'. We may first
// have to pause the current activity, but this is an important point
// where we have decided to go to 'next' so keep track of that.
// XXX "App Redirected" dialog is getting too many false positives
// at this point, so turn off for now.
if (false) {
if (mLastStartedActivity != null && !mLastStartedActivity.finishing) {
long now = SystemClock.uptimeMillis();
final boolean inTime = mLastStartedActivity.startTime != 0
&& (mLastStartedActivity.startTime + START_WARN_TIME) >= now;
final int lastUid = mLastStartedActivity.info.applicationInfo.uid;
final int nextUid = next.info.applicationInfo.uid;
if (inTime && lastUid != nextUid
&& lastUid != next.launchedFromUid
&& mService.checkPermission(
android.Manifest.permission.STOP_APP_SWITCHES,
-1, next.launchedFromUid)
!= PackageManager.PERMISSION_GRANTED) {
mService.showLaunchWarningLocked(mLastStartedActivity, next);
} else {
next.startTime = now;
mLastStartedActivity = next;
}
} else {
next.startTime = SystemClock.uptimeMillis();
mLastStartedActivity = next;
}
}
// We need to start pausing the current activity so the top one
// can be resumed...
if (mResumedActivity != null) {
if (DEBUG_SWITCH) Slog.v(TAG, "Skip resume: need to start pausing");
startPausingLocked(userLeaving, false);
return true;
}
if (prev != null && prev != next) {
if (!prev.waitingVisible && next != null && !next.nowVisible) {
prev.waitingVisible = true;
mWaitingVisibleActivities.add(prev);
if (DEBUG_SWITCH) Slog.v(
TAG, "Resuming top, waiting visible to hide: " + prev);
} else {
// The next activity is already visible, so hide the previous
// activity's windows right now so we can show the new one ASAP.
// We only do this if the previous is finishing, which should mean
// it is on top of the one being resumed so hiding it quickly
// is good. Otherwise, we want to do the normal route of allowing
// the resumed activity to be shown so we can decide if the
// previous should actually be hidden depending on whether the
// new one is found to be full-screen or not.
if (prev.finishing) {
mService.mWindowManager.setAppVisibility(prev, false);
if (DEBUG_SWITCH) Slog.v(TAG, "Not waiting for visible to hide: "
+ prev + ", waitingVisible="
+ (prev != null ? prev.waitingVisible : null)
+ ", nowVisible=" + next.nowVisible);
} else {
if (DEBUG_SWITCH) Slog.v(TAG, "Previous already visible but still waiting to hide: "
+ prev + ", waitingVisible="
+ (prev != null ? prev.waitingVisible : null)
+ ", nowVisible=" + next.nowVisible);
}
}
}
// We are starting up the next activity, so tell the window manager
// that the previous one will be hidden soon. This way it can know
// to ignore it when computing the desired screen orientation.
if (prev != null) {
if (prev.finishing) {
if (DEBUG_TRANSITION) Slog.v(TAG,
"Prepare close transition: prev=" + prev);
if (mNoAnimActivities.contains(prev)) {
mService.mWindowManager.prepareAppTransition(WindowManagerPolicy.TRANSIT_NONE);
} else {
mService.mWindowManager.prepareAppTransition(prev.task == next.task
? WindowManagerPolicy.TRANSIT_ACTIVITY_CLOSE
: WindowManagerPolicy.TRANSIT_TASK_CLOSE);
}
mService.mWindowManager.setAppWillBeHidden(prev);
mService.mWindowManager.setAppVisibility(prev, false);
} else {
if (DEBUG_TRANSITION) Slog.v(TAG,
"Prepare open transition: prev=" + prev);
if (mNoAnimActivities.contains(next)) {
mService.mWindowManager.prepareAppTransition(WindowManagerPolicy.TRANSIT_NONE);
} else {
mService.mWindowManager.prepareAppTransition(prev.task == next.task
? WindowManagerPolicy.TRANSIT_ACTIVITY_OPEN
: WindowManagerPolicy.TRANSIT_TASK_OPEN);
}
}
if (false) {
mService.mWindowManager.setAppWillBeHidden(prev);
mService.mWindowManager.setAppVisibility(prev, false);
}
} else if (mHistory.size() > 1) {
if (DEBUG_TRANSITION) Slog.v(TAG,
"Prepare open transition: no previous");
if (mNoAnimActivities.contains(next)) {
mService.mWindowManager.prepareAppTransition(WindowManagerPolicy.TRANSIT_NONE);
} else {
mService.mWindowManager.prepareAppTransition(WindowManagerPolicy.TRANSIT_ACTIVITY_OPEN);
}
}
if (next.app != null && next.app.thread != null) {
if (DEBUG_SWITCH) Slog.v(TAG, "Resume running: " + next);
// This activity is now becoming visible.
mService.mWindowManager.setAppVisibility(next, true);
ActivityRecord lastResumedActivity = mResumedActivity;
ActivityState lastState = next.state;
mService.updateCpuStats();
next.state = ActivityState.RESUMED;
mResumedActivity = next;
next.task.touchActiveTime();
mService.updateLruProcessLocked(next.app, true, true);
updateLRUListLocked(next);
// Have the window manager re-evaluate the orientation of
// the screen based on the new activity order.
boolean updated = false;
if (mMainStack) {
synchronized (mService) {
Configuration config = mService.mWindowManager.updateOrientationFromAppTokens(
mService.mConfiguration,
next.mayFreezeScreenLocked(next.app) ? next : null);
if (config != null) {
next.frozenBeforeDestroy = true;
}
updated = mService.updateConfigurationLocked(config, next);
}
}
if (!updated) {
// The configuration update wasn't able to keep the existing
// instance of the activity, and instead started a new one.
// We should be all done, but let's just make sure our activity
// is still at the top and schedule another run if something
// weird happened.
ActivityRecord nextNext = topRunningActivityLocked(null);
if (DEBUG_SWITCH) Slog.i(TAG,
"Activity config changed during resume: " + next
+ ", new next: " + nextNext);
if (nextNext != next) {
// Do over!
mHandler.sendEmptyMessage(RESUME_TOP_ACTIVITY_MSG);
}
if (mMainStack) {
mService.setFocusedActivityLocked(next);
}
ensureActivitiesVisibleLocked(null, 0);
mService.mWindowManager.executeAppTransition();
mNoAnimActivities.clear();
return true;
}
try {
// Deliver all pending results.
ArrayList a = next.results;
if (a != null) {
final int N = a.size();
if (!next.finishing && N > 0) {
if (DEBUG_RESULTS) Slog.v(
TAG, "Delivering results to " + next
+ ": " + a);
next.app.thread.scheduleSendResult(next, a);
}
}
if (next.newIntents != null) {
next.app.thread.scheduleNewIntent(next.newIntents, next);
}
EventLog.writeEvent(EventLogTags.AM_RESUME_ACTIVITY,
System.identityHashCode(next),
next.task.taskId, next.shortComponentName);
next.app.thread.scheduleResumeActivity(next,
mService.isNextTransitionForward());
pauseIfSleepingLocked();
} catch (Exception e) {
// Whoops, need to restart this activity!
next.state = lastState;
mResumedActivity = lastResumedActivity;
Slog.i(TAG, "Restarting because process died: " + next);
if (!next.hasBeenLaunched) {
next.hasBeenLaunched = true;
} else {
if (SHOW_APP_STARTING_PREVIEW && mMainStack) {
mService.mWindowManager.setAppStartingWindow(
next, next.packageName, next.theme,
next.nonLocalizedLabel,
next.labelRes, next.icon, null, true);
}
}
startSpecificActivityLocked(next, true, false);
return true;
}
// From this point on, if something goes wrong there is no way
// to recover the activity.
try {
next.visible = true;
completeResumeLocked(next);
} catch (Exception e) {
// If any exception gets thrown, toss away this
// activity and try the next one.
Slog.w(TAG, "Exception thrown during resume of " + next, e);
requestFinishActivityLocked(next, Activity.RESULT_CANCELED, null,
"resume-exception");
return true;
}
// Didn't need to use the icicle, and it is now out of date.
next.icicle = null;
next.haveState = false;
next.stopped = false;
} else {
// Whoops, need to restart this activity!
if (!next.hasBeenLaunched) {
next.hasBeenLaunched = true;
} else {
if (SHOW_APP_STARTING_PREVIEW) {
mService.mWindowManager.setAppStartingWindow(
next, next.packageName, next.theme,
next.nonLocalizedLabel,
next.labelRes, next.icon, null, true);
}
if (DEBUG_SWITCH) Slog.v(TAG, "Restarting: " + next);
}
startSpecificActivityLocked(next, true, true);
}
return true;
}
private final void startActivityLocked(ActivityRecord r, boolean newTask,
boolean doResume) {
final int NH = mHistory.size();
int addPos = -1;
if (!newTask) {
// If starting in an existing task, find where that is...
boolean startIt = true;
for (int i = NH-1; i >= 0; i--) {
ActivityRecord p = (ActivityRecord)mHistory.get(i);
if (p.finishing) {
continue;
}
if (p.task == r.task) {
// Here it is! Now, if this is not yet visible to the
// user, then just add it without starting; it will
// get started when the user navigates back to it.
addPos = i+1;
if (!startIt) {
mHistory.add(addPos, r);
r.inHistory = true;
r.task.numActivities++;
mService.mWindowManager.addAppToken(addPos, r, r.task.taskId,
r.info.screenOrientation, r.fullscreen);
if (VALIDATE_TOKENS) {
mService.mWindowManager.validateAppTokens(mHistory);
}
return;
}
break;
}
if (p.fullscreen) {
startIt = false;
}
}
}
// Place a new activity at top of stack, so it is next to interact
// with the user.
if (addPos < 0) {
addPos = NH;
}
// If we are not placing the new activity frontmost, we do not want
// to deliver the onUserLeaving callback to the actual frontmost
// activity
if (addPos < NH) {
mUserLeaving = false;
if (DEBUG_USER_LEAVING) Slog.v(TAG, "startActivity() behind front, mUserLeaving=false");
}
// Slot the activity into the history stack and proceed
mHistory.add(addPos, r);
r.inHistory = true;
r.frontOfTask = newTask;
r.task.numActivities++;
if (NH > 0) {
// We want to show the starting preview window if we are
// switching to a new task, or the next activity's process is
// not currently running.
boolean showStartingIcon = newTask;
ProcessRecord proc = r.app;
if (proc == null) {
proc = mService.mProcessNames.get(r.processName, r.info.applicationInfo.uid);
}
if (proc == null || proc.thread == null) {
showStartingIcon = true;
}
if (DEBUG_TRANSITION) Slog.v(TAG,
"Prepare open transition: starting " + r);
if ((r.intent.getFlags()&Intent.FLAG_ACTIVITY_NO_ANIMATION) != 0) {
mService.mWindowManager.prepareAppTransition(WindowManagerPolicy.TRANSIT_NONE);
mNoAnimActivities.add(r);
} else if ((r.intent.getFlags()&Intent.FLAG_ACTIVITY_CLEAR_WHEN_TASK_RESET) != 0) {
mService.mWindowManager.prepareAppTransition(
WindowManagerPolicy.TRANSIT_TASK_OPEN);
mNoAnimActivities.remove(r);
} else {
mService.mWindowManager.prepareAppTransition(newTask
? WindowManagerPolicy.TRANSIT_TASK_OPEN
: WindowManagerPolicy.TRANSIT_ACTIVITY_OPEN);
mNoAnimActivities.remove(r);
}
mService.mWindowManager.addAppToken(
addPos, r, r.task.taskId, r.info.screenOrientation, r.fullscreen);
boolean doShow = true;
if (newTask) {
// Even though this activity is starting fresh, we still need
// to reset it to make sure we apply affinities to move any
// existing activities from other tasks in to it.
// If the caller has requested that the target task be
// reset, then do so.
if ((r.intent.getFlags()
&Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED) != 0) {
resetTaskIfNeededLocked(r, r);
doShow = topRunningNonDelayedActivityLocked(null) == r;
}
}
if (SHOW_APP_STARTING_PREVIEW && doShow) {
// Figure out if we are transitioning from another activity that is
// "has the same starting icon" as the next one. This allows the
// window manager to keep the previous window it had previously
// created, if it still had one.
ActivityRecord prev = mResumedActivity;
if (prev != null) {
// We don't want to reuse the previous starting preview if:
// (1) The current activity is in a different task.
if (prev.task != r.task) prev = null;
// (2) The current activity is already displayed.
else if (prev.nowVisible) prev = null;
}
mService.mWindowManager.setAppStartingWindow(
r, r.packageName, r.theme, r.nonLocalizedLabel,
r.labelRes, r.icon, prev, showStartingIcon);
}
} else {
// If this is the first activity, don't do any fancy animations,
// because there is nothing for it to animate on top of.
mService.mWindowManager.addAppToken(addPos, r, r.task.taskId,
r.info.screenOrientation, r.fullscreen);
}
if (VALIDATE_TOKENS) {
mService.mWindowManager.validateAppTokens(mHistory);
}
if (doResume) {
resumeTopActivityLocked(null);
}
}
/**
* Perform a reset of the given task, if needed as part of launching it.
* Returns the new HistoryRecord at the top of the task.
*/
private final ActivityRecord resetTaskIfNeededLocked(ActivityRecord taskTop,
ActivityRecord newActivity) {
boolean forceReset = (newActivity.info.flags
&ActivityInfo.FLAG_CLEAR_TASK_ON_LAUNCH) != 0;
if (taskTop.task.getInactiveDuration() > ACTIVITY_INACTIVE_RESET_TIME) {
if ((newActivity.info.flags
&ActivityInfo.FLAG_ALWAYS_RETAIN_TASK_STATE) == 0) {
forceReset = true;
}
}
final TaskRecord task = taskTop.task;
// We are going to move through the history list so that we can look
// at each activity 'target' with 'below' either the interesting
// activity immediately below it in the stack or null.
ActivityRecord target = null;
int targetI = 0;
int taskTopI = -1;
int replyChainEnd = -1;
int lastReparentPos = -1;
for (int i=mHistory.size()-1; i>=-1; i--) {
ActivityRecord below = i >= 0 ? (ActivityRecord)mHistory.get(i) : null;
if (below != null && below.finishing) {
continue;
}
if (target == null) {
target = below;
targetI = i;
// If we were in the middle of a reply chain before this
// task, it doesn't appear like the root of the chain wants
// anything interesting, so drop it.
replyChainEnd = -1;
continue;
}
final int flags = target.info.flags;
final boolean finishOnTaskLaunch =
(flags&ActivityInfo.FLAG_FINISH_ON_TASK_LAUNCH) != 0;
final boolean allowTaskReparenting =
(flags&ActivityInfo.FLAG_ALLOW_TASK_REPARENTING) != 0;
if (target.task == task) {
// We are inside of the task being reset... we'll either
// finish this activity, push it out for another task,
// or leave it as-is. We only do this
// for activities that are not the root of the task (since
// if we finish the root, we may no longer have the task!).
if (taskTopI < 0) {
taskTopI = targetI;
}
if (below != null && below.task == task) {
final boolean clearWhenTaskReset =
(target.intent.getFlags()
&Intent.FLAG_ACTIVITY_CLEAR_WHEN_TASK_RESET) != 0;
if (!finishOnTaskLaunch && !clearWhenTaskReset && target.resultTo != null) {
// If this activity is sending a reply to a previous
// activity, we can't do anything with it now until
// we reach the start of the reply chain.
// XXX note that we are assuming the result is always
// to the previous activity, which is almost always
// the case but we really shouldn't count on.
if (replyChainEnd < 0) {
replyChainEnd = targetI;
}
} else if (!finishOnTaskLaunch && !clearWhenTaskReset && allowTaskReparenting
&& target.taskAffinity != null
&& !target.taskAffinity.equals(task.affinity)) {
// If this activity has an affinity for another
// task, then we need to move it out of here. We will
// move it as far out of the way as possible, to the
// bottom of the activity stack. This also keeps it
// correctly ordered with any activities we previously
// moved.
ActivityRecord p = (ActivityRecord)mHistory.get(0);
if (target.taskAffinity != null
&& target.taskAffinity.equals(p.task.affinity)) {
// If the activity currently at the bottom has the
// same task affinity as the one we are moving,
// then merge it into the same task.
target.task = p.task;
if (DEBUG_TASKS) Slog.v(TAG, "Start pushing activity " + target
+ " out to bottom task " + p.task);
} else {
mService.mCurTask++;
if (mService.mCurTask <= 0) {
mService.mCurTask = 1;
}
target.task = new TaskRecord(mService.mCurTask, target.info, null,
(target.info.flags&ActivityInfo.FLAG_CLEAR_TASK_ON_LAUNCH) != 0);
target.task.affinityIntent = target.intent;
if (DEBUG_TASKS) Slog.v(TAG, "Start pushing activity " + target
+ " out to new task " + target.task);
}
mService.mWindowManager.setAppGroupId(target, task.taskId);
if (replyChainEnd < 0) {
replyChainEnd = targetI;
}
int dstPos = 0;
for (int srcPos=targetI; srcPos<=replyChainEnd; srcPos++) {
p = (ActivityRecord)mHistory.get(srcPos);
if (p.finishing) {
continue;
}
if (DEBUG_TASKS) Slog.v(TAG, "Pushing next activity " + p
+ " out to target's task " + target.task);
task.numActivities--;
p.task = target.task;
target.task.numActivities++;
mHistory.remove(srcPos);
mHistory.add(dstPos, p);
mService.mWindowManager.moveAppToken(dstPos, p);
mService.mWindowManager.setAppGroupId(p, p.task.taskId);
dstPos++;
if (VALIDATE_TOKENS) {
mService.mWindowManager.validateAppTokens(mHistory);
}
i++;
}
if (taskTop == p) {
taskTop = below;
}
if (taskTopI == replyChainEnd) {
taskTopI = -1;
}
replyChainEnd = -1;
if (mMainStack) {
mService.addRecentTaskLocked(target.task);
}
} else if (forceReset || finishOnTaskLaunch
|| clearWhenTaskReset) {
// If the activity should just be removed -- either
// because it asks for it, or the task should be
// cleared -- then finish it and anything that is
// part of its reply chain.
if (clearWhenTaskReset) {
// In this case, we want to finish this activity
// and everything above it, so be sneaky and pretend
// like these are all in the reply chain.
replyChainEnd = targetI+1;
while (replyChainEnd < mHistory.size() &&
((ActivityRecord)mHistory.get(
replyChainEnd)).task == task) {
replyChainEnd++;
}
replyChainEnd--;
} else if (replyChainEnd < 0) {
replyChainEnd = targetI;
}
ActivityRecord p = null;
for (int srcPos=targetI; srcPos<=replyChainEnd; srcPos++) {
p = (ActivityRecord)mHistory.get(srcPos);
if (p.finishing) {
continue;
}
if (finishActivityLocked(p, srcPos,
Activity.RESULT_CANCELED, null, "reset")) {
replyChainEnd--;
srcPos--;
}
}
if (taskTop == p) {
taskTop = below;
}
if (taskTopI == replyChainEnd) {
taskTopI = -1;
}
replyChainEnd = -1;
} else {
// If we were in the middle of a chain, well the
// activity that started it all doesn't want anything
// special, so leave it all as-is.
replyChainEnd = -1;
}
} else {
// Reached the bottom of the task -- any reply chain
// should be left as-is.
replyChainEnd = -1;
}
} else if (target.resultTo != null) {
// If this activity is sending a reply to a previous
// activity, we can't do anything with it now until
// we reach the start of the reply chain.
// XXX note that we are assuming the result is always
// to the previous activity, which is almost always
// the case but we really shouldn't count on.
if (replyChainEnd < 0) {
replyChainEnd = targetI;
}
} else if (taskTopI >= 0 && allowTaskReparenting
&& task.affinity != null
&& task.affinity.equals(target.taskAffinity)) {
// We are inside of another task... if this activity has
// an affinity for our task, then either remove it if we are
// clearing or move it over to our task. Note that
// we currently punt on the case where we are resetting a
// task that is not at the top but who has activities above
// with an affinity to it... this is really not a normal
// case, and we will need to later pull that task to the front
// and usually at that point we will do the reset and pick
// up those remaining activities. (This only happens if
// someone starts an activity in a new task from an activity
// in a task that is not currently on top.)
if (forceReset || finishOnTaskLaunch) {
if (replyChainEnd < 0) {
replyChainEnd = targetI;
}
ActivityRecord p = null;
for (int srcPos=targetI; srcPos<=replyChainEnd; srcPos++) {
p = (ActivityRecord)mHistory.get(srcPos);
if (p.finishing) {
continue;
}
if (finishActivityLocked(p, srcPos,
Activity.RESULT_CANCELED, null, "reset")) {
taskTopI--;
lastReparentPos--;
replyChainEnd--;
srcPos--;
}
}
replyChainEnd = -1;
} else {
if (replyChainEnd < 0) {
replyChainEnd = targetI;
}
for (int srcPos=replyChainEnd; srcPos>=targetI; srcPos--) {
ActivityRecord p = (ActivityRecord)mHistory.get(srcPos);
if (p.finishing) {
continue;
}
if (lastReparentPos < 0) {
lastReparentPos = taskTopI;
taskTop = p;
} else {
lastReparentPos--;
}
mHistory.remove(srcPos);
p.task.numActivities--;
p.task = task;
mHistory.add(lastReparentPos, p);
if (DEBUG_TASKS) Slog.v(TAG, "Pulling activity " + p
+ " in to resetting task " + task);
task.numActivities++;
mService.mWindowManager.moveAppToken(lastReparentPos, p);
mService.mWindowManager.setAppGroupId(p, p.task.taskId);
if (VALIDATE_TOKENS) {
mService.mWindowManager.validateAppTokens(mHistory);
}
}
replyChainEnd = -1;
// Now we've moved it in to place... but what if this is
// a singleTop activity and we have put it on top of another
// instance of the same activity? Then we drop the instance
// below so it remains singleTop.
if (target.info.launchMode == ActivityInfo.LAUNCH_SINGLE_TOP) {
for (int j=lastReparentPos-1; j>=0; j--) {
ActivityRecord p = (ActivityRecord)mHistory.get(j);
if (p.finishing) {
continue;
}
if (p.intent.getComponent().equals(target.intent.getComponent())) {
if (finishActivityLocked(p, j,
Activity.RESULT_CANCELED, null, "replace")) {
taskTopI--;
lastReparentPos--;
}
}
}
}
}
}
target = below;
targetI = i;
}
return taskTop;
}
/**
* Perform clear operation as requested by
* {@link Intent#FLAG_ACTIVITY_CLEAR_TOP}: search from the top of the
* stack to the given task, then look for
* an instance of that activity in the stack and, if found, finish all
* activities on top of it and return the instance.
*
* @param newR Description of the new activity being started.
* @return Returns the old activity that should be continue to be used,
* or null if none was found.
*/
private final ActivityRecord performClearTaskLocked(int taskId,
ActivityRecord newR, int launchFlags, boolean doClear) {
int i = mHistory.size();
// First find the requested task.
while (i > 0) {
i--;
ActivityRecord r = (ActivityRecord)mHistory.get(i);
if (r.task.taskId == taskId) {
i++;
break;
}
}
// Now clear it.
while (i > 0) {
i--;
ActivityRecord r = (ActivityRecord)mHistory.get(i);
if (r.finishing) {
continue;
}
if (r.task.taskId != taskId) {
return null;
}
if (r.realActivity.equals(newR.realActivity)) {
// Here it is! Now finish everything in front...
ActivityRecord ret = r;
if (doClear) {
while (i < (mHistory.size()-1)) {
i++;
r = (ActivityRecord)mHistory.get(i);
if (r.finishing) {
continue;
}
if (finishActivityLocked(r, i, Activity.RESULT_CANCELED,
null, "clear")) {
i--;
}
}
}
// Finally, if this is a normal launch mode (that is, not
// expecting onNewIntent()), then we will finish the current
// instance of the activity so a new fresh one can be started.
if (ret.launchMode == ActivityInfo.LAUNCH_MULTIPLE
&& (launchFlags&Intent.FLAG_ACTIVITY_SINGLE_TOP) == 0) {
if (!ret.finishing) {
int index = indexOfTokenLocked(ret);
if (index >= 0) {
finishActivityLocked(ret, index, Activity.RESULT_CANCELED,
null, "clear");
}
return null;
}
}
return ret;
}
}
return null;
}
/**
* Find the activity in the history stack within the given task. Returns
* the index within the history at which it's found, or < 0 if not found.
*/
private final int findActivityInHistoryLocked(ActivityRecord r, int task) {
int i = mHistory.size();
while (i > 0) {
i--;
ActivityRecord candidate = (ActivityRecord)mHistory.get(i);
if (candidate.task.taskId != task) {
break;
}
if (candidate.realActivity.equals(r.realActivity)) {
return i;
}
}
return -1;
}
/**
* Reorder the history stack so that the activity at the given index is
* brought to the front.
*/
private final ActivityRecord moveActivityToFrontLocked(int where) {
ActivityRecord newTop = (ActivityRecord)mHistory.remove(where);
int top = mHistory.size();
ActivityRecord oldTop = (ActivityRecord)mHistory.get(top-1);
mHistory.add(top, newTop);
oldTop.frontOfTask = false;
newTop.frontOfTask = true;
return newTop;
}
final int startActivityLocked(IApplicationThread caller,
Intent intent, String resolvedType,
Uri[] grantedUriPermissions,
int grantedMode, ActivityInfo aInfo, IBinder resultTo,
String resultWho, int requestCode,
int callingPid, int callingUid, boolean onlyIfNeeded,
boolean componentSpecified) {
int err = START_SUCCESS;
ProcessRecord callerApp = null;
if (caller != null) {
callerApp = mService.getRecordForAppLocked(caller);
if (callerApp != null) {
callingPid = callerApp.pid;
callingUid = callerApp.info.uid;
} else {
Slog.w(TAG, "Unable to find app for caller " + caller
+ " (pid=" + callingPid + ") when starting: "
+ intent.toString());
err = START_PERMISSION_DENIED;
}
}
if (err == START_SUCCESS) {
Slog.i(TAG, "Starting: " + intent + " from pid "
+ (callerApp != null ? callerApp.pid : callingPid));
}
ActivityRecord sourceRecord = null;
ActivityRecord resultRecord = null;
if (resultTo != null) {
int index = indexOfTokenLocked(resultTo);
if (DEBUG_RESULTS) Slog.v(
TAG, "Sending result to " + resultTo + " (index " + index + ")");
if (index >= 0) {
sourceRecord = (ActivityRecord)mHistory.get(index);
if (requestCode >= 0 && !sourceRecord.finishing) {
resultRecord = sourceRecord;
}
}
}
int launchFlags = intent.getFlags();
if ((launchFlags&Intent.FLAG_ACTIVITY_FORWARD_RESULT) != 0
&& sourceRecord != null) {
// Transfer the result target from the source activity to the new
// one being started, including any failures.
if (requestCode >= 0) {
return START_FORWARD_AND_REQUEST_CONFLICT;
}
resultRecord = sourceRecord.resultTo;
resultWho = sourceRecord.resultWho;
requestCode = sourceRecord.requestCode;
sourceRecord.resultTo = null;
if (resultRecord != null) {
resultRecord.removeResultsLocked(
sourceRecord, resultWho, requestCode);
}
}
if (err == START_SUCCESS && intent.getComponent() == null) {
// We couldn't find a class that can handle the given Intent.
// That's the end of that!
err = START_INTENT_NOT_RESOLVED;
}
if (err == START_SUCCESS && aInfo == null) {
// We couldn't find the specific class specified in the Intent.
// Also the end of the line.
err = START_CLASS_NOT_FOUND;
}
if (err != START_SUCCESS) {
if (resultRecord != null) {
sendActivityResultLocked(-1,
resultRecord, resultWho, requestCode,
Activity.RESULT_CANCELED, null);
}
return err;
}
final int perm = mService.checkComponentPermission(aInfo.permission, callingPid,
callingUid, aInfo.exported ? -1 : aInfo.applicationInfo.uid);
if (perm != PackageManager.PERMISSION_GRANTED) {
if (resultRecord != null) {
sendActivityResultLocked(-1,
resultRecord, resultWho, requestCode,
Activity.RESULT_CANCELED, null);
}
String msg = "Permission Denial: starting " + intent.toString()
+ " from " + callerApp + " (pid=" + callingPid
+ ", uid=" + callingUid + ")"
+ " requires " + aInfo.permission;
Slog.w(TAG, msg);
throw new SecurityException(msg);
}
if (mMainStack) {
if (mService.mController != null) {
boolean abort = false;
try {
// The Intent we give to the watcher has the extra data
// stripped off, since it can contain private information.
Intent watchIntent = intent.cloneFilter();
abort = !mService.mController.activityStarting(watchIntent,
aInfo.applicationInfo.packageName);
} catch (RemoteException e) {
mService.mController = null;
}
if (abort) {
if (resultRecord != null) {
sendActivityResultLocked(-1,
resultRecord, resultWho, requestCode,
Activity.RESULT_CANCELED, null);
}
// We pretend to the caller that it was really started, but
// they will just get a cancel result.
return START_SUCCESS;
}
}
}
ActivityRecord r = new ActivityRecord(mService, this, callerApp, callingUid,
intent, resolvedType, aInfo, mService.mConfiguration,
resultRecord, resultWho, requestCode, componentSpecified);
if (mMainStack) {
if (mResumedActivity == null
|| mResumedActivity.info.applicationInfo.uid != callingUid) {
if (!mService.checkAppSwitchAllowedLocked(callingPid, callingUid, "Activity start")) {
PendingActivityLaunch pal = new PendingActivityLaunch();
pal.r = r;
pal.sourceRecord = sourceRecord;
pal.grantedUriPermissions = grantedUriPermissions;
pal.grantedMode = grantedMode;
pal.onlyIfNeeded = onlyIfNeeded;
mService.mPendingActivityLaunches.add(pal);
return START_SWITCHES_CANCELED;
}
}
if (mService.mDidAppSwitch) {
// This is the second allowed switch since we stopped switches,
// so now just generally allow switches. Use case: user presses
// home (switches disabled, switch to home, mDidAppSwitch now true);
// user taps a home icon (coming from home so allowed, we hit here
// and now allow anyone to switch again).
mService.mAppSwitchesAllowedTime = 0;
} else {
mService.mDidAppSwitch = true;
}
mService.doPendingActivityLaunchesLocked(false);
}
return startActivityUncheckedLocked(r, sourceRecord,
grantedUriPermissions, grantedMode, onlyIfNeeded, true);
}
final int startActivityUncheckedLocked(ActivityRecord r,
ActivityRecord sourceRecord, Uri[] grantedUriPermissions,
int grantedMode, boolean onlyIfNeeded, boolean doResume) {
final Intent intent = r.intent;
final int callingUid = r.launchedFromUid;
int launchFlags = intent.getFlags();
// We'll invoke onUserLeaving before onPause only if the launching
// activity did not explicitly state that this is an automated launch.
mUserLeaving = (launchFlags&Intent.FLAG_ACTIVITY_NO_USER_ACTION) == 0;
if (DEBUG_USER_LEAVING) Slog.v(TAG,
"startActivity() => mUserLeaving=" + mUserLeaving);
// If the caller has asked not to resume at this point, we make note
// of this in the record so that we can skip it when trying to find
// the top running activity.
if (!doResume) {
r.delayedResume = true;
}
ActivityRecord notTop = (launchFlags&Intent.FLAG_ACTIVITY_PREVIOUS_IS_TOP)
!= 0 ? r : null;
// If the onlyIfNeeded flag is set, then we can do this if the activity
// being launched is the same as the one making the call... or, as
// a special case, if we do not know the caller then we count the
// current top activity as the caller.
if (onlyIfNeeded) {
ActivityRecord checkedCaller = sourceRecord;
if (checkedCaller == null) {
checkedCaller = topRunningNonDelayedActivityLocked(notTop);
}
if (!checkedCaller.realActivity.equals(r.realActivity)) {
// Caller is not the same as launcher, so always needed.
onlyIfNeeded = false;
}
}
if (sourceRecord == null) {
// This activity is not being started from another... in this
// case we -always- start a new task.
if ((launchFlags&Intent.FLAG_ACTIVITY_NEW_TASK) == 0) {
Slog.w(TAG, "startActivity called from non-Activity context; forcing Intent.FLAG_ACTIVITY_NEW_TASK for: "
+ intent);
launchFlags |= Intent.FLAG_ACTIVITY_NEW_TASK;
}
} else if (sourceRecord.launchMode == ActivityInfo.LAUNCH_SINGLE_INSTANCE) {
// The original activity who is starting us is running as a single
// instance... this new activity it is starting must go on its
// own task.
launchFlags |= Intent.FLAG_ACTIVITY_NEW_TASK;
} else if (r.launchMode == ActivityInfo.LAUNCH_SINGLE_INSTANCE
|| r.launchMode == ActivityInfo.LAUNCH_SINGLE_TASK) {
// The activity being started is a single instance... it always
// gets launched into its own task.
launchFlags |= Intent.FLAG_ACTIVITY_NEW_TASK;
}
if (r.resultTo != null && (launchFlags&Intent.FLAG_ACTIVITY_NEW_TASK) != 0) {
// For whatever reason this activity is being launched into a new
// task... yet the caller has requested a result back. Well, that
// is pretty messed up, so instead immediately send back a cancel
// and let the new task continue launched as normal without a
// dependency on its originator.
Slog.w(TAG, "Activity is launching as a new task, so cancelling activity result.");
sendActivityResultLocked(-1,
r.resultTo, r.resultWho, r.requestCode,
Activity.RESULT_CANCELED, null);
r.resultTo = null;
}
boolean addingToTask = false;
if (((launchFlags&Intent.FLAG_ACTIVITY_NEW_TASK) != 0 &&
(launchFlags&Intent.FLAG_ACTIVITY_MULTIPLE_TASK) == 0)
|| r.launchMode == ActivityInfo.LAUNCH_SINGLE_TASK
|| r.launchMode == ActivityInfo.LAUNCH_SINGLE_INSTANCE) {
// If bring to front is requested, and no result is requested, and
// we can find a task that was started with this same
// component, then instead of launching bring that one to the front.
if (r.resultTo == null) {
// See if there is a task to bring to the front. If this is
// a SINGLE_INSTANCE activity, there can be one and only one
// instance of it in the history, and it is always in its own
// unique task, so we do a special search.
ActivityRecord taskTop = r.launchMode != ActivityInfo.LAUNCH_SINGLE_INSTANCE
? findTaskLocked(intent, r.info)
: findActivityLocked(intent, r.info);
if (taskTop != null) {
if (taskTop.task.intent == null) {
// This task was started because of movement of
// the activity based on affinity... now that we
// are actually launching it, we can assign the
// base intent.
taskTop.task.setIntent(intent, r.info);
}
// If the target task is not in the front, then we need
// to bring it to the front... except... well, with
// SINGLE_TASK_LAUNCH it's not entirely clear. We'd like
// to have the same behavior as if a new instance was
// being started, which means not bringing it to the front
// if the caller is not itself in the front.
ActivityRecord curTop = topRunningNonDelayedActivityLocked(notTop);
if (curTop != null && curTop.task != taskTop.task) {
r.intent.addFlags(Intent.FLAG_ACTIVITY_BROUGHT_TO_FRONT);
boolean callerAtFront = sourceRecord == null
|| curTop.task == sourceRecord.task;
if (callerAtFront) {
// We really do want to push this one into the
// user's face, right now.
moveTaskToFrontLocked(taskTop.task, r);
}
}
// If the caller has requested that the target task be
// reset, then do so.
if ((launchFlags&Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED) != 0) {
taskTop = resetTaskIfNeededLocked(taskTop, r);
}
if (onlyIfNeeded) {
// We don't need to start a new activity, and
// the client said not to do anything if that
// is the case, so this is it! And for paranoia, make
// sure we have correctly resumed the top activity.
if (doResume) {
resumeTopActivityLocked(null);
}
return START_RETURN_INTENT_TO_CALLER;
}
if ((launchFlags&Intent.FLAG_ACTIVITY_CLEAR_TOP) != 0
|| r.launchMode == ActivityInfo.LAUNCH_SINGLE_TASK
|| r.launchMode == ActivityInfo.LAUNCH_SINGLE_INSTANCE) {
// In this situation we want to remove all activities
// from the task up to the one being started. In most
// cases this means we are resetting the task to its
// initial state.
ActivityRecord top = performClearTaskLocked(
taskTop.task.taskId, r, launchFlags, true);
if (top != null) {
if (top.frontOfTask) {
// Activity aliases may mean we use different
// intents for the top activity, so make sure
// the task now has the identity of the new
// intent.
top.task.setIntent(r.intent, r.info);
}
logStartActivity(EventLogTags.AM_NEW_INTENT, r, top.task);
top.deliverNewIntentLocked(callingUid, r.intent);
} else {
// A special case: we need to
// start the activity because it is not currently
// running, and the caller has asked to clear the
// current task to have this activity at the top.
addingToTask = true;
// Now pretend like this activity is being started
// by the top of its task, so it is put in the
// right place.
sourceRecord = taskTop;
}
} else if (r.realActivity.equals(taskTop.task.realActivity)) {
// In this case the top activity on the task is the
// same as the one being launched, so we take that
// as a request to bring the task to the foreground.
// If the top activity in the task is the root
// activity, deliver this new intent to it if it
// desires.
if ((launchFlags&Intent.FLAG_ACTIVITY_SINGLE_TOP) != 0
&& taskTop.realActivity.equals(r.realActivity)) {
logStartActivity(EventLogTags.AM_NEW_INTENT, r, taskTop.task);
if (taskTop.frontOfTask) {
taskTop.task.setIntent(r.intent, r.info);
}
taskTop.deliverNewIntentLocked(callingUid, r.intent);
} else if (!r.intent.filterEquals(taskTop.task.intent)) {
// In this case we are launching the root activity
// of the task, but with a different intent. We
// should start a new instance on top.
addingToTask = true;
sourceRecord = taskTop;
}
} else if ((launchFlags&Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED) == 0) {
// In this case an activity is being launched in to an
// existing task, without resetting that task. This
// is typically the situation of launching an activity
// from a notification or shortcut. We want to place
// the new activity on top of the current task.
addingToTask = true;
sourceRecord = taskTop;
} else if (!taskTop.task.rootWasReset) {
// In this case we are launching in to an existing task
// that has not yet been started from its front door.
// The current task has been brought to the front.
// Ideally, we'd probably like to place this new task
// at the bottom of its stack, but that's a little hard
// to do with the current organization of the code so
// for now we'll just drop it.
taskTop.task.setIntent(r.intent, r.info);
}
if (!addingToTask) {
// We didn't do anything... but it was needed (a.k.a., client
// don't use that intent!) And for paranoia, make
// sure we have correctly resumed the top activity.
if (doResume) {
resumeTopActivityLocked(null);
}
return START_TASK_TO_FRONT;
}
}
}
}
//String uri = r.intent.toURI();
//Intent intent2 = new Intent(uri);
//Slog.i(TAG, "Given intent: " + r.intent);
//Slog.i(TAG, "URI is: " + uri);
//Slog.i(TAG, "To intent: " + intent2);
if (r.packageName != null) {
// If the activity being launched is the same as the one currently
// at the top, then we need to check if it should only be launched
// once.
ActivityRecord top = topRunningNonDelayedActivityLocked(notTop);
if (top != null && r.resultTo == null) {
if (top.realActivity.equals(r.realActivity)) {
if (top.app != null && top.app.thread != null) {
if ((launchFlags&Intent.FLAG_ACTIVITY_SINGLE_TOP) != 0
|| r.launchMode == ActivityInfo.LAUNCH_SINGLE_TOP
|| r.launchMode == ActivityInfo.LAUNCH_SINGLE_TASK) {
logStartActivity(EventLogTags.AM_NEW_INTENT, top, top.task);
// For paranoia, make sure we have correctly
// resumed the top activity.
if (doResume) {
resumeTopActivityLocked(null);
}
if (onlyIfNeeded) {
// We don't need to start a new activity, and
// the client said not to do anything if that
// is the case, so this is it!
return START_RETURN_INTENT_TO_CALLER;
}
top.deliverNewIntentLocked(callingUid, r.intent);
return START_DELIVERED_TO_TOP;
}
}
}
}
} else {
if (r.resultTo != null) {
sendActivityResultLocked(-1,
r.resultTo, r.resultWho, r.requestCode,
Activity.RESULT_CANCELED, null);
}
return START_CLASS_NOT_FOUND;
}
boolean newTask = false;
// Should this be considered a new task?
if (r.resultTo == null && !addingToTask
&& (launchFlags&Intent.FLAG_ACTIVITY_NEW_TASK) != 0) {
// todo: should do better management of integers.
mService.mCurTask++;
if (mService.mCurTask <= 0) {
mService.mCurTask = 1;
}
r.task = new TaskRecord(mService.mCurTask, r.info, intent,
(r.info.flags&ActivityInfo.FLAG_CLEAR_TASK_ON_LAUNCH) != 0);
if (DEBUG_TASKS) Slog.v(TAG, "Starting new activity " + r
+ " in new task " + r.task);
newTask = true;
if (mMainStack) {
mService.addRecentTaskLocked(r.task);
}
} else if (sourceRecord != null) {
if (!addingToTask &&
(launchFlags&Intent.FLAG_ACTIVITY_CLEAR_TOP) != 0) {
// In this case, we are adding the activity to an existing
// task, but the caller has asked to clear that task if the
// activity is already running.
ActivityRecord top = performClearTaskLocked(
sourceRecord.task.taskId, r, launchFlags, true);
if (top != null) {
logStartActivity(EventLogTags.AM_NEW_INTENT, r, top.task);
top.deliverNewIntentLocked(callingUid, r.intent);
// For paranoia, make sure we have correctly
// resumed the top activity.
if (doResume) {
resumeTopActivityLocked(null);
}
return START_DELIVERED_TO_TOP;
}
} else if (!addingToTask &&
(launchFlags&Intent.FLAG_ACTIVITY_REORDER_TO_FRONT) != 0) {
// In this case, we are launching an activity in our own task
// that may already be running somewhere in the history, and
// we want to shuffle it to the front of the stack if so.
int where = findActivityInHistoryLocked(r, sourceRecord.task.taskId);
if (where >= 0) {
ActivityRecord top = moveActivityToFrontLocked(where);
logStartActivity(EventLogTags.AM_NEW_INTENT, r, top.task);
top.deliverNewIntentLocked(callingUid, r.intent);
if (doResume) {
resumeTopActivityLocked(null);
}
return START_DELIVERED_TO_TOP;
}
}
// An existing activity is starting this new activity, so we want
// to keep the new one in the same task as the one that is starting
// it.
r.task = sourceRecord.task;
if (DEBUG_TASKS) Slog.v(TAG, "Starting new activity " + r
+ " in existing task " + r.task);
} else {
// This not being started from an existing activity, and not part
// of a new task... just put it in the top task, though these days
// this case should never happen.
final int N = mHistory.size();
ActivityRecord prev =
N > 0 ? (ActivityRecord)mHistory.get(N-1) : null;
r.task = prev != null
? prev.task
: new TaskRecord(mService.mCurTask, r.info, intent,
(r.info.flags&ActivityInfo.FLAG_CLEAR_TASK_ON_LAUNCH) != 0);
if (DEBUG_TASKS) Slog.v(TAG, "Starting new activity " + r
+ " in new guessed " + r.task);
}
if (grantedUriPermissions != null && callingUid > 0) {
for (int i=0; i<grantedUriPermissions.length; i++) {
mService.grantUriPermissionLocked(callingUid, r.packageName,
grantedUriPermissions[i], grantedMode, r.getUriPermissionsLocked());
}
}
mService.grantUriPermissionFromIntentLocked(callingUid, r.packageName,
intent, r.getUriPermissionsLocked());
if (newTask) {
EventLog.writeEvent(EventLogTags.AM_CREATE_TASK, r.task.taskId);
}
logStartActivity(EventLogTags.AM_CREATE_ACTIVITY, r, r.task);
startActivityLocked(r, newTask, doResume);
return START_SUCCESS;
}
final int startActivityMayWait(IApplicationThread caller,
Intent intent, String resolvedType, Uri[] grantedUriPermissions,
int grantedMode, IBinder resultTo,
String resultWho, int requestCode, boolean onlyIfNeeded,
boolean debug, WaitResult outResult, Configuration config) {
// Refuse possible leaked file descriptors
if (intent != null && intent.hasFileDescriptors()) {
throw new IllegalArgumentException("File descriptors passed in Intent");
}
boolean componentSpecified = intent.getComponent() != null;
// Don't modify the client's object!
intent = new Intent(intent);
// Collect information about the target of the Intent.
ActivityInfo aInfo;
try {
ResolveInfo rInfo =
AppGlobals.getPackageManager().resolveIntent(
intent, resolvedType,
PackageManager.MATCH_DEFAULT_ONLY
| ActivityManagerService.STOCK_PM_FLAGS);
aInfo = rInfo != null ? rInfo.activityInfo : null;
} catch (RemoteException e) {
aInfo = null;
}
if (aInfo != null) {
// Store the found target back into the intent, because now that
// we have it we never want to do this again. For example, if the
// user navigates back to this point in the history, we should
// always restart the exact same activity.
intent.setComponent(new ComponentName(
aInfo.applicationInfo.packageName, aInfo.name));
// Don't debug things in the system process
if (debug) {
if (!aInfo.processName.equals("system")) {
mService.setDebugApp(aInfo.processName, true, false);
}
}
}
synchronized (mService) {
int callingPid;
int callingUid;
if (caller == null) {
callingPid = Binder.getCallingPid();
callingUid = Binder.getCallingUid();
} else {
callingPid = callingUid = -1;
}
mConfigWillChange = config != null
&& mService.mConfiguration.diff(config) != 0;
if (DEBUG_CONFIGURATION) Slog.v(TAG,
"Starting activity when config will change = " + mConfigWillChange);
final long origId = Binder.clearCallingIdentity();
if (mMainStack && aInfo != null &&
(aInfo.applicationInfo.flags&ApplicationInfo.FLAG_CANT_SAVE_STATE) != 0) {
// This may be a heavy-weight process! Check to see if we already
// have another, different heavy-weight process running.
if (aInfo.processName.equals(aInfo.applicationInfo.packageName)) {
if (mService.mHeavyWeightProcess != null &&
(mService.mHeavyWeightProcess.info.uid != aInfo.applicationInfo.uid ||
!mService.mHeavyWeightProcess.processName.equals(aInfo.processName))) {
int realCallingPid = callingPid;
int realCallingUid = callingUid;
if (caller != null) {
ProcessRecord callerApp = mService.getRecordForAppLocked(caller);
if (callerApp != null) {
realCallingPid = callerApp.pid;
realCallingUid = callerApp.info.uid;
} else {
Slog.w(TAG, "Unable to find app for caller " + caller
+ " (pid=" + realCallingPid + ") when starting: "
+ intent.toString());
return START_PERMISSION_DENIED;
}
}
IIntentSender target = mService.getIntentSenderLocked(
IActivityManager.INTENT_SENDER_ACTIVITY, "android",
realCallingUid, null, null, 0, intent,
resolvedType, PendingIntent.FLAG_CANCEL_CURRENT
| PendingIntent.FLAG_ONE_SHOT);
Intent newIntent = new Intent();
if (requestCode >= 0) {
// Caller is requesting a result.
newIntent.putExtra(HeavyWeightSwitcherActivity.KEY_HAS_RESULT, true);
}
newIntent.putExtra(HeavyWeightSwitcherActivity.KEY_INTENT,
new IntentSender(target));
if (mService.mHeavyWeightProcess.activities.size() > 0) {
ActivityRecord hist = mService.mHeavyWeightProcess.activities.get(0);
newIntent.putExtra(HeavyWeightSwitcherActivity.KEY_CUR_APP,
hist.packageName);
newIntent.putExtra(HeavyWeightSwitcherActivity.KEY_CUR_TASK,
hist.task.taskId);
}
newIntent.putExtra(HeavyWeightSwitcherActivity.KEY_NEW_APP,
aInfo.packageName);
newIntent.setFlags(intent.getFlags());
newIntent.setClassName("android",
HeavyWeightSwitcherActivity.class.getName());
intent = newIntent;
resolvedType = null;
caller = null;
callingUid = Binder.getCallingUid();
callingPid = Binder.getCallingPid();
componentSpecified = true;
try {
ResolveInfo rInfo =
AppGlobals.getPackageManager().resolveIntent(
intent, null,
PackageManager.MATCH_DEFAULT_ONLY
| ActivityManagerService.STOCK_PM_FLAGS);
aInfo = rInfo != null ? rInfo.activityInfo : null;
} catch (RemoteException e) {
aInfo = null;
}
}
}
}
int res = startActivityLocked(caller, intent, resolvedType,
grantedUriPermissions, grantedMode, aInfo,
resultTo, resultWho, requestCode, callingPid, callingUid,
onlyIfNeeded, componentSpecified);
if (mConfigWillChange && mMainStack) {
// If the caller also wants to switch to a new configuration,
// do so now. This allows a clean switch, as we are waiting
// for the current activity to pause (so we will not destroy
// it), and have not yet started the next activity.
mService.enforceCallingPermission(android.Manifest.permission.CHANGE_CONFIGURATION,
"updateConfiguration()");
mConfigWillChange = false;
if (DEBUG_CONFIGURATION) Slog.v(TAG,
"Updating to new configuration after starting activity.");
mService.updateConfigurationLocked(config, null);
}
Binder.restoreCallingIdentity(origId);
if (outResult != null) {
outResult.result = res;
if (res == IActivityManager.START_SUCCESS) {
mWaitingActivityLaunched.add(outResult);
do {
try {
mService.wait();
} catch (InterruptedException e) {
}
} while (!outResult.timeout && outResult.who == null);
} else if (res == IActivityManager.START_TASK_TO_FRONT) {
ActivityRecord r = this.topRunningActivityLocked(null);
if (r.nowVisible) {
outResult.timeout = false;
outResult.who = new ComponentName(r.info.packageName, r.info.name);
outResult.totalTime = 0;
outResult.thisTime = 0;
} else {
outResult.thisTime = SystemClock.uptimeMillis();
mWaitingActivityVisible.add(outResult);
do {
try {
mService.wait();
} catch (InterruptedException e) {
}
} while (!outResult.timeout && outResult.who == null);
}
}
}
return res;
}
}
void reportActivityLaunchedLocked(boolean timeout, ActivityRecord r,
long thisTime, long totalTime) {
for (int i=mWaitingActivityLaunched.size()-1; i>=0; i--) {
WaitResult w = mWaitingActivityLaunched.get(i);
w.timeout = timeout;
if (r != null) {
w.who = new ComponentName(r.info.packageName, r.info.name);
}
w.thisTime = thisTime;
w.totalTime = totalTime;
}
mService.notifyAll();
}
void reportActivityVisibleLocked(ActivityRecord r) {
for (int i=mWaitingActivityVisible.size()-1; i>=0; i--) {
WaitResult w = mWaitingActivityVisible.get(i);
w.timeout = false;
if (r != null) {
w.who = new ComponentName(r.info.packageName, r.info.name);
}
w.totalTime = SystemClock.uptimeMillis() - w.thisTime;
w.thisTime = w.totalTime;
}
mService.notifyAll();
}
void sendActivityResultLocked(int callingUid, ActivityRecord r,
String resultWho, int requestCode, int resultCode, Intent data) {
if (callingUid > 0) {
mService.grantUriPermissionFromIntentLocked(callingUid, r.packageName,
data, r.getUriPermissionsLocked());
}
if (DEBUG_RESULTS) Slog.v(TAG, "Send activity result to " + r
+ " : who=" + resultWho + " req=" + requestCode
+ " res=" + resultCode + " data=" + data);
if (mResumedActivity == r && r.app != null && r.app.thread != null) {
try {
ArrayList<ResultInfo> list = new ArrayList<ResultInfo>();
list.add(new ResultInfo(resultWho, requestCode,
resultCode, data));
r.app.thread.scheduleSendResult(r, list);
return;
} catch (Exception e) {
Slog.w(TAG, "Exception thrown sending result to " + r, e);
}
}
r.addResultLocked(null, resultWho, requestCode, resultCode, data);
}
private final void stopActivityLocked(ActivityRecord r) {
if (DEBUG_SWITCH) Slog.d(TAG, "Stopping: " + r);
if ((r.intent.getFlags()&Intent.FLAG_ACTIVITY_NO_HISTORY) != 0
|| (r.info.flags&ActivityInfo.FLAG_NO_HISTORY) != 0) {
if (!r.finishing) {
requestFinishActivityLocked(r, Activity.RESULT_CANCELED, null,
"no-history");
}
} else if (r.app != null && r.app.thread != null) {
if (mMainStack) {
if (mService.mFocusedActivity == r) {
mService.setFocusedActivityLocked(topRunningActivityLocked(null));
}
}
r.resumeKeyDispatchingLocked();
try {
r.stopped = false;
r.state = ActivityState.STOPPING;
if (DEBUG_VISBILITY) Slog.v(
TAG, "Stopping visible=" + r.visible + " for " + r);
if (!r.visible) {
mService.mWindowManager.setAppVisibility(r, false);
}
r.app.thread.scheduleStopActivity(r, r.visible, r.configChangeFlags);
} catch (Exception e) {
// Maybe just ignore exceptions here... if the process
// has crashed, our death notification will clean things
// up.
Slog.w(TAG, "Exception thrown during pause", e);
// Just in case, assume it to be stopped.
r.stopped = true;
r.state = ActivityState.STOPPED;
if (r.configDestroy) {
destroyActivityLocked(r, true);
}
}
}
}
final ArrayList<ActivityRecord> processStoppingActivitiesLocked(
boolean remove) {
int N = mStoppingActivities.size();
if (N <= 0) return null;
ArrayList<ActivityRecord> stops = null;
final boolean nowVisible = mResumedActivity != null
&& mResumedActivity.nowVisible
&& !mResumedActivity.waitingVisible;
for (int i=0; i<N; i++) {
ActivityRecord s = mStoppingActivities.get(i);
if (localLOGV) Slog.v(TAG, "Stopping " + s + ": nowVisible="
+ nowVisible + " waitingVisible=" + s.waitingVisible
+ " finishing=" + s.finishing);
if (s.waitingVisible && nowVisible) {
mWaitingVisibleActivities.remove(s);
s.waitingVisible = false;
if (s.finishing) {
// If this activity is finishing, it is sitting on top of
// everyone else but we now know it is no longer needed...
// so get rid of it. Otherwise, we need to go through the
// normal flow and hide it once we determine that it is
// hidden by the activities in front of it.
if (localLOGV) Slog.v(TAG, "Before stopping, can hide: " + s);
mService.mWindowManager.setAppVisibility(s, false);
}
}
if (!s.waitingVisible && remove) {
if (localLOGV) Slog.v(TAG, "Ready to stop: " + s);
if (stops == null) {
stops = new ArrayList<ActivityRecord>();
}
stops.add(s);
mStoppingActivities.remove(i);
N--;
i--;
}
}
return stops;
}
final void activityIdleInternal(IBinder token, boolean fromTimeout,
Configuration config) {
if (localLOGV) Slog.v(TAG, "Activity idle: " + token);
ArrayList<ActivityRecord> stops = null;
ArrayList<ActivityRecord> finishes = null;
ArrayList<ActivityRecord> thumbnails = null;
int NS = 0;
int NF = 0;
int NT = 0;
IApplicationThread sendThumbnail = null;
boolean booting = false;
boolean enableScreen = false;
synchronized (mService) {
if (token != null) {
mHandler.removeMessages(IDLE_TIMEOUT_MSG, token);
}
// Get the activity record.
int index = indexOfTokenLocked(token);
if (index >= 0) {
ActivityRecord r = (ActivityRecord)mHistory.get(index);
if (fromTimeout) {
reportActivityLaunchedLocked(fromTimeout, r, -1, -1);
}
// This is a hack to semi-deal with a race condition
// in the client where it can be constructed with a
// newer configuration from when we asked it to launch.
// We'll update with whatever configuration it now says
// it used to launch.
if (config != null) {
r.configuration = config;
}
// No longer need to keep the device awake.
if (mResumedActivity == r && mLaunchingActivity.isHeld()) {
mHandler.removeMessages(LAUNCH_TIMEOUT_MSG);
mLaunchingActivity.release();
}
// We are now idle. If someone is waiting for a thumbnail from
// us, we can now deliver.
r.idle = true;
mService.scheduleAppGcsLocked();
if (r.thumbnailNeeded && r.app != null && r.app.thread != null) {
sendThumbnail = r.app.thread;
r.thumbnailNeeded = false;
}
// If this activity is fullscreen, set up to hide those under it.
if (DEBUG_VISBILITY) Slog.v(TAG, "Idle activity for " + r);
ensureActivitiesVisibleLocked(null, 0);
//Slog.i(TAG, "IDLE: mBooted=" + mBooted + ", fromTimeout=" + fromTimeout);
if (mMainStack) {
if (!mService.mBooted && !fromTimeout) {
mService.mBooted = true;
enableScreen = true;
}
}
} else if (fromTimeout) {
reportActivityLaunchedLocked(fromTimeout, null, -1, -1);
}
// Atomically retrieve all of the other things to do.
stops = processStoppingActivitiesLocked(true);
NS = stops != null ? stops.size() : 0;
if ((NF=mFinishingActivities.size()) > 0) {
finishes = new ArrayList<ActivityRecord>(mFinishingActivities);
mFinishingActivities.clear();
}
if ((NT=mService.mCancelledThumbnails.size()) > 0) {
thumbnails = new ArrayList<ActivityRecord>(mService.mCancelledThumbnails);
mService.mCancelledThumbnails.clear();
}
if (mMainStack) {
booting = mService.mBooting;
mService.mBooting = false;
}
}
int i;
// Send thumbnail if requested.
if (sendThumbnail != null) {
try {
sendThumbnail.requestThumbnail(token);
} catch (Exception e) {
Slog.w(TAG, "Exception thrown when requesting thumbnail", e);
mService.sendPendingThumbnail(null, token, null, null, true);
}
}
// Stop any activities that are scheduled to do so but have been
// waiting for the next one to start.
for (i=0; i<NS; i++) {
ActivityRecord r = (ActivityRecord)stops.get(i);
synchronized (mService) {
if (r.finishing) {
finishCurrentActivityLocked(r, FINISH_IMMEDIATELY);
} else {
stopActivityLocked(r);
}
}
}
// Finish any activities that are scheduled to do so but have been
// waiting for the next one to start.
for (i=0; i<NF; i++) {
ActivityRecord r = (ActivityRecord)finishes.get(i);
synchronized (mService) {
destroyActivityLocked(r, true);
}
}
// Report back to any thumbnail receivers.
for (i=0; i<NT; i++) {
ActivityRecord r = (ActivityRecord)thumbnails.get(i);
mService.sendPendingThumbnail(r, null, null, null, true);
}
if (booting) {
mService.finishBooting();
}
mService.trimApplications();
//dump();
//mWindowManager.dump();
if (enableScreen) {
mService.enableScreenAfterBoot();
}
}
/**
* @return Returns true if the activity is being finished, false if for
* some reason it is being left as-is.
*/
final boolean requestFinishActivityLocked(IBinder token, int resultCode,
Intent resultData, String reason) {
if (DEBUG_RESULTS) Slog.v(
TAG, "Finishing activity: token=" + token
+ ", result=" + resultCode + ", data=" + resultData);
int index = indexOfTokenLocked(token);
if (index < 0) {
return false;
}
ActivityRecord r = (ActivityRecord)mHistory.get(index);
// Is this the last activity left?
boolean lastActivity = true;
for (int i=mHistory.size()-1; i>=0; i--) {
ActivityRecord p = (ActivityRecord)mHistory.get(i);
if (!p.finishing && p != r) {
lastActivity = false;
break;
}
}
// If this is the last activity, but it is the home activity, then
// just don't finish it.
if (lastActivity) {
if (r.intent.hasCategory(Intent.CATEGORY_HOME)) {
return false;
}
}
finishActivityLocked(r, index, resultCode, resultData, reason);
return true;
}
/**
* @return Returns true if this activity has been removed from the history
* list, or false if it is still in the list and will be removed later.
*/
final boolean finishActivityLocked(ActivityRecord r, int index,
int resultCode, Intent resultData, String reason) {
if (r.finishing) {
Slog.w(TAG, "Duplicate finish request for " + r);
return false;
}
r.finishing = true;
EventLog.writeEvent(EventLogTags.AM_FINISH_ACTIVITY,
System.identityHashCode(r),
r.task.taskId, r.shortComponentName, reason);
r.task.numActivities--;
if (index < (mHistory.size()-1)) {
ActivityRecord next = (ActivityRecord)mHistory.get(index+1);
if (next.task == r.task) {
if (r.frontOfTask) {
// The next activity is now the front of the task.
next.frontOfTask = true;
}
if ((r.intent.getFlags()&Intent.FLAG_ACTIVITY_CLEAR_WHEN_TASK_RESET) != 0) {
// If the caller asked that this activity (and all above it)
// be cleared when the task is reset, don't lose that information,
// but propagate it up to the next activity.
next.intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_WHEN_TASK_RESET);
}
}
}
r.pauseKeyDispatchingLocked();
if (mMainStack) {
if (mService.mFocusedActivity == r) {
mService.setFocusedActivityLocked(topRunningActivityLocked(null));
}
}
// send the result
ActivityRecord resultTo = r.resultTo;
if (resultTo != null) {
if (DEBUG_RESULTS) Slog.v(TAG, "Adding result to " + resultTo
+ " who=" + r.resultWho + " req=" + r.requestCode
+ " res=" + resultCode + " data=" + resultData);
if (r.info.applicationInfo.uid > 0) {
mService.grantUriPermissionFromIntentLocked(r.info.applicationInfo.uid,
resultTo.packageName, resultData,
resultTo.getUriPermissionsLocked());
}
resultTo.addResultLocked(r, r.resultWho, r.requestCode, resultCode,
resultData);
r.resultTo = null;
}
else if (DEBUG_RESULTS) Slog.v(TAG, "No result destination from " + r);
// Make sure this HistoryRecord is not holding on to other resources,
// because clients have remote IPC references to this object so we
// can't assume that will go away and want to avoid circular IPC refs.
r.results = null;
r.pendingResults = null;
r.newIntents = null;
r.icicle = null;
if (mService.mPendingThumbnails.size() > 0) {
// There are clients waiting to receive thumbnails so, in case
// this is an activity that someone is waiting for, add it
// to the pending list so we can correctly update the clients.
mService.mCancelledThumbnails.add(r);
}
if (mResumedActivity == r) {
boolean endTask = index <= 0
|| ((ActivityRecord)mHistory.get(index-1)).task != r.task;
if (DEBUG_TRANSITION) Slog.v(TAG,
"Prepare close transition: finishing " + r);
mService.mWindowManager.prepareAppTransition(endTask
? WindowManagerPolicy.TRANSIT_TASK_CLOSE
: WindowManagerPolicy.TRANSIT_ACTIVITY_CLOSE);
// Tell window manager to prepare for this one to be removed.
mService.mWindowManager.setAppVisibility(r, false);
if (mPausingActivity == null) {
if (DEBUG_PAUSE) Slog.v(TAG, "Finish needs to pause: " + r);
if (DEBUG_USER_LEAVING) Slog.v(TAG, "finish() => pause with userLeaving=false");
startPausingLocked(false, false);
}
} else if (r.state != ActivityState.PAUSING) {
// If the activity is PAUSING, we will complete the finish once
// it is done pausing; else we can just directly finish it here.
if (DEBUG_PAUSE) Slog.v(TAG, "Finish not pausing: " + r);
return finishCurrentActivityLocked(r, index,
FINISH_AFTER_PAUSE) == null;
} else {
if (DEBUG_PAUSE) Slog.v(TAG, "Finish waiting for pause of: " + r);
}
return false;
}
private static final int FINISH_IMMEDIATELY = 0;
private static final int FINISH_AFTER_PAUSE = 1;
private static final int FINISH_AFTER_VISIBLE = 2;
private final ActivityRecord finishCurrentActivityLocked(ActivityRecord r,
int mode) {
final int index = indexOfTokenLocked(r);
if (index < 0) {
return null;
}
return finishCurrentActivityLocked(r, index, mode);
}
private final ActivityRecord finishCurrentActivityLocked(ActivityRecord r,
int index, int mode) {
// First things first: if this activity is currently visible,
// and the resumed activity is not yet visible, then hold off on
// finishing until the resumed one becomes visible.
if (mode == FINISH_AFTER_VISIBLE && r.nowVisible) {
if (!mStoppingActivities.contains(r)) {
mStoppingActivities.add(r);
if (mStoppingActivities.size() > 3) {
// If we already have a few activities waiting to stop,
// then give up on things going idle and start clearing
// them out.
Message msg = Message.obtain();
msg.what = IDLE_NOW_MSG;
mHandler.sendMessage(msg);
}
}
r.state = ActivityState.STOPPING;
mService.updateOomAdjLocked();
return r;
}
// make sure the record is cleaned out of other places.
mStoppingActivities.remove(r);
mWaitingVisibleActivities.remove(r);
if (mResumedActivity == r) {
mResumedActivity = null;
}
final ActivityState prevState = r.state;
r.state = ActivityState.FINISHING;
if (mode == FINISH_IMMEDIATELY
|| prevState == ActivityState.STOPPED
|| prevState == ActivityState.INITIALIZING) {
// If this activity is already stopped, we can just finish
// it right now.
return destroyActivityLocked(r, true) ? null : r;
} else {
// Need to go through the full pause cycle to get this
// activity into the stopped state and then finish it.
if (localLOGV) Slog.v(TAG, "Enqueueing pending finish: " + r);
mFinishingActivities.add(r);
resumeTopActivityLocked(null);
}
return r;
}
/**
* Perform the common clean-up of an activity record. This is called both
* as part of destroyActivityLocked() (when destroying the client-side
* representation) and cleaning things up as a result of its hosting
* processing going away, in which case there is no remaining client-side
* state to destroy so only the cleanup here is needed.
*/
final void cleanUpActivityLocked(ActivityRecord r, boolean cleanServices) {
if (mResumedActivity == r) {
mResumedActivity = null;
}
if (mService.mFocusedActivity == r) {
mService.mFocusedActivity = null;
}
r.configDestroy = false;
r.frozenBeforeDestroy = false;
// Make sure this record is no longer in the pending finishes list.
// This could happen, for example, if we are trimming activities
// down to the max limit while they are still waiting to finish.
mFinishingActivities.remove(r);
mWaitingVisibleActivities.remove(r);
// Remove any pending results.
if (r.finishing && r.pendingResults != null) {
for (WeakReference<PendingIntentRecord> apr : r.pendingResults) {
PendingIntentRecord rec = apr.get();
if (rec != null) {
mService.cancelIntentSenderLocked(rec, false);
}
}
r.pendingResults = null;
}
if (cleanServices) {
cleanUpActivityServicesLocked(r);
}
if (mService.mPendingThumbnails.size() > 0) {
// There are clients waiting to receive thumbnails so, in case
// this is an activity that someone is waiting for, add it
// to the pending list so we can correctly update the clients.
mService.mCancelledThumbnails.add(r);
}
// Get rid of any pending idle timeouts.
mHandler.removeMessages(PAUSE_TIMEOUT_MSG, r);
mHandler.removeMessages(IDLE_TIMEOUT_MSG, r);
}
private final void removeActivityFromHistoryLocked(ActivityRecord r) {
if (r.state != ActivityState.DESTROYED) {
mHistory.remove(r);
r.inHistory = false;
r.state = ActivityState.DESTROYED;
mService.mWindowManager.removeAppToken(r);
if (VALIDATE_TOKENS) {
mService.mWindowManager.validateAppTokens(mHistory);
}
cleanUpActivityServicesLocked(r);
r.removeUriPermissionsLocked();
}
}
/**
* Perform clean-up of service connections in an activity record.
*/
final void cleanUpActivityServicesLocked(ActivityRecord r) {
// Throw away any services that have been bound by this activity.
if (r.connections != null) {
Iterator<ConnectionRecord> it = r.connections.iterator();
while (it.hasNext()) {
ConnectionRecord c = it.next();
mService.removeConnectionLocked(c, null, r);
}
r.connections = null;
}
}
/**
* Destroy the current CLIENT SIDE instance of an activity. This may be
* called both when actually finishing an activity, or when performing
* a configuration switch where we destroy the current client-side object
* but then create a new client-side object for this same HistoryRecord.
*/
final boolean destroyActivityLocked(ActivityRecord r,
boolean removeFromApp) {
if (DEBUG_SWITCH) Slog.v(
TAG, "Removing activity: token=" + r
+ ", app=" + (r.app != null ? r.app.processName : "(null)"));
EventLog.writeEvent(EventLogTags.AM_DESTROY_ACTIVITY,
System.identityHashCode(r),
r.task.taskId, r.shortComponentName);
boolean removedFromHistory = false;
cleanUpActivityLocked(r, false);
final boolean hadApp = r.app != null;
if (hadApp) {
if (removeFromApp) {
int idx = r.app.activities.indexOf(r);
if (idx >= 0) {
r.app.activities.remove(idx);
}
if (mService.mHeavyWeightProcess == r.app && r.app.activities.size() <= 0) {
mService.mHeavyWeightProcess = null;
mService.mHandler.sendEmptyMessage(
ActivityManagerService.CANCEL_HEAVY_NOTIFICATION_MSG);
}
if (r.app.activities.size() == 0) {
// No longer have activities, so update location in
// LRU list.
mService.updateLruProcessLocked(r.app, true, false);
}
}
boolean skipDestroy = false;
try {
if (DEBUG_SWITCH) Slog.i(TAG, "Destroying: " + r);
r.app.thread.scheduleDestroyActivity(r, r.finishing,
r.configChangeFlags);
} catch (Exception e) {
// We can just ignore exceptions here... if the process
// has crashed, our death notification will clean things
// up.
//Slog.w(TAG, "Exception thrown during finish", e);
if (r.finishing) {
removeActivityFromHistoryLocked(r);
removedFromHistory = true;
skipDestroy = true;
}
}
r.app = null;
r.nowVisible = false;
if (r.finishing && !skipDestroy) {
r.state = ActivityState.DESTROYING;
Message msg = mHandler.obtainMessage(DESTROY_TIMEOUT_MSG);
msg.obj = r;
mHandler.sendMessageDelayed(msg, DESTROY_TIMEOUT);
} else {
r.state = ActivityState.DESTROYED;
}
} else {
// remove this record from the history.
if (r.finishing) {
removeActivityFromHistoryLocked(r);
removedFromHistory = true;
} else {
r.state = ActivityState.DESTROYED;
}
}
r.configChangeFlags = 0;
if (!mLRUActivities.remove(r) && hadApp) {
Slog.w(TAG, "Activity " + r + " being finished, but not in LRU list");
}
return removedFromHistory;
}
final void activityDestroyed(IBinder token) {
synchronized (mService) {
mHandler.removeMessages(DESTROY_TIMEOUT_MSG, token);
int index = indexOfTokenLocked(token);
if (index >= 0) {
ActivityRecord r = (ActivityRecord)mHistory.get(index);
if (r.state == ActivityState.DESTROYING) {
final long origId = Binder.clearCallingIdentity();
removeActivityFromHistoryLocked(r);
Binder.restoreCallingIdentity(origId);
}
}
}
}
private static void removeHistoryRecordsForAppLocked(ArrayList list, ProcessRecord app) {
int i = list.size();
if (localLOGV) Slog.v(
TAG, "Removing app " + app + " from list " + list
+ " with " + i + " entries");
while (i > 0) {
i--;
ActivityRecord r = (ActivityRecord)list.get(i);
if (localLOGV) Slog.v(
TAG, "Record #" + i + " " + r + ": app=" + r.app);
if (r.app == app) {
if (localLOGV) Slog.v(TAG, "Removing this entry!");
list.remove(i);
}
}
}
void removeHistoryRecordsForAppLocked(ProcessRecord app) {
removeHistoryRecordsForAppLocked(mLRUActivities, app);
removeHistoryRecordsForAppLocked(mStoppingActivities, app);
removeHistoryRecordsForAppLocked(mWaitingVisibleActivities, app);
removeHistoryRecordsForAppLocked(mFinishingActivities, app);
}
final void moveTaskToFrontLocked(TaskRecord tr, ActivityRecord reason) {
if (DEBUG_SWITCH) Slog.v(TAG, "moveTaskToFront: " + tr);
final int task = tr.taskId;
int top = mHistory.size()-1;
if (top < 0 || ((ActivityRecord)mHistory.get(top)).task.taskId == task) {
// nothing to do!
return;
}
ArrayList moved = new ArrayList();
// Applying the affinities may have removed entries from the history,
// so get the size again.
top = mHistory.size()-1;
int pos = top;
// Shift all activities with this task up to the top
// of the stack, keeping them in the same internal order.
while (pos >= 0) {
ActivityRecord r = (ActivityRecord)mHistory.get(pos);
if (localLOGV) Slog.v(
TAG, "At " + pos + " ckp " + r.task + ": " + r);
boolean first = true;
if (r.task.taskId == task) {
if (localLOGV) Slog.v(TAG, "Removing and adding at " + top);
mHistory.remove(pos);
mHistory.add(top, r);
moved.add(0, r);
top--;
if (first && mMainStack) {
mService.addRecentTaskLocked(r.task);
first = false;
}
}
pos--;
}
if (DEBUG_TRANSITION) Slog.v(TAG,
"Prepare to front transition: task=" + tr);
if (reason != null &&
(reason.intent.getFlags()&Intent.FLAG_ACTIVITY_NO_ANIMATION) != 0) {
mService.mWindowManager.prepareAppTransition(WindowManagerPolicy.TRANSIT_NONE);
ActivityRecord r = topRunningActivityLocked(null);
if (r != null) {
mNoAnimActivities.add(r);
}
} else {
mService.mWindowManager.prepareAppTransition(WindowManagerPolicy.TRANSIT_TASK_TO_FRONT);
}
mService.mWindowManager.moveAppTokensToTop(moved);
if (VALIDATE_TOKENS) {
mService.mWindowManager.validateAppTokens(mHistory);
}
finishTaskMoveLocked(task);
EventLog.writeEvent(EventLogTags.AM_TASK_TO_FRONT, task);
}
private final void finishTaskMoveLocked(int task) {
resumeTopActivityLocked(null);
}
/**
* Worker method for rearranging history stack. Implements the function of moving all
* activities for a specific task (gathering them if disjoint) into a single group at the
* bottom of the stack.
*
* If a watcher is installed, the action is preflighted and the watcher has an opportunity
* to premeptively cancel the move.
*
* @param task The taskId to collect and move to the bottom.
* @return Returns true if the move completed, false if not.
*/
final boolean moveTaskToBackLocked(int task, ActivityRecord reason) {
Slog.i(TAG, "moveTaskToBack: " + task);
// If we have a watcher, preflight the move before committing to it. First check
// for *other* available tasks, but if none are available, then try again allowing the
// current task to be selected.
if (mMainStack && mService.mController != null) {
ActivityRecord next = topRunningActivityLocked(null, task);
if (next == null) {
next = topRunningActivityLocked(null, 0);
}
if (next != null) {
// ask watcher if this is allowed
boolean moveOK = true;
try {
moveOK = mService.mController.activityResuming(next.packageName);
} catch (RemoteException e) {
mService.mController = null;
}
if (!moveOK) {
return false;
}
}
}
ArrayList moved = new ArrayList();
if (DEBUG_TRANSITION) Slog.v(TAG,
"Prepare to back transition: task=" + task);
final int N = mHistory.size();
int bottom = 0;
int pos = 0;
// Shift all activities with this task down to the bottom
// of the stack, keeping them in the same internal order.
while (pos < N) {
ActivityRecord r = (ActivityRecord)mHistory.get(pos);
if (localLOGV) Slog.v(
TAG, "At " + pos + " ckp " + r.task + ": " + r);
if (r.task.taskId == task) {
if (localLOGV) Slog.v(TAG, "Removing and adding at " + (N-1));
mHistory.remove(pos);
mHistory.add(bottom, r);
moved.add(r);
bottom++;
}
pos++;
}
if (reason != null &&
(reason.intent.getFlags()&Intent.FLAG_ACTIVITY_NO_ANIMATION) != 0) {
mService.mWindowManager.prepareAppTransition(WindowManagerPolicy.TRANSIT_NONE);
ActivityRecord r = topRunningActivityLocked(null);
if (r != null) {
mNoAnimActivities.add(r);
}
} else {
mService.mWindowManager.prepareAppTransition(WindowManagerPolicy.TRANSIT_TASK_TO_BACK);
}
mService.mWindowManager.moveAppTokensToBottom(moved);
if (VALIDATE_TOKENS) {
mService.mWindowManager.validateAppTokens(mHistory);
}
finishTaskMoveLocked(task);
return true;
}
private final void logStartActivity(int tag, ActivityRecord r,
TaskRecord task) {
EventLog.writeEvent(tag,
System.identityHashCode(r), task.taskId,
r.shortComponentName, r.intent.getAction(),
r.intent.getType(), r.intent.getDataString(),
r.intent.getFlags());
}
/**
* Make sure the given activity matches the current configuration. Returns
* false if the activity had to be destroyed. Returns true if the
* configuration is the same, or the activity will remain running as-is
* for whatever reason. Ensures the HistoryRecord is updated with the
* correct configuration and all other bookkeeping is handled.
*/
final boolean ensureActivityConfigurationLocked(ActivityRecord r,
int globalChanges) {
if (mConfigWillChange) {
if (DEBUG_SWITCH || DEBUG_CONFIGURATION) Slog.v(TAG,
"Skipping config check (will change): " + r);
return true;
}
if (DEBUG_SWITCH || DEBUG_CONFIGURATION) Slog.v(TAG,
"Ensuring correct configuration: " + r);
// Short circuit: if the two configurations are the exact same
// object (the common case), then there is nothing to do.
Configuration newConfig = mService.mConfiguration;
if (r.configuration == newConfig) {
if (DEBUG_SWITCH || DEBUG_CONFIGURATION) Slog.v(TAG,
"Configuration unchanged in " + r);
return true;
}
// We don't worry about activities that are finishing.
if (r.finishing) {
if (DEBUG_SWITCH || DEBUG_CONFIGURATION) Slog.v(TAG,
"Configuration doesn't matter in finishing " + r);
r.stopFreezingScreenLocked(false);
return true;
}
// Okay we now are going to make this activity have the new config.
// But then we need to figure out how it needs to deal with that.
Configuration oldConfig = r.configuration;
r.configuration = newConfig;
// If the activity isn't currently running, just leave the new
// configuration and it will pick that up next time it starts.
if (r.app == null || r.app.thread == null) {
if (DEBUG_SWITCH || DEBUG_CONFIGURATION) Slog.v(TAG,
"Configuration doesn't matter not running " + r);
r.stopFreezingScreenLocked(false);
return true;
}
// Figure out what has changed between the two configurations.
int changes = oldConfig.diff(newConfig);
if (DEBUG_SWITCH || DEBUG_CONFIGURATION) {
Slog.v(TAG, "Checking to restart " + r.info.name + ": changed=0x"
+ Integer.toHexString(changes) + ", handles=0x"
+ Integer.toHexString(r.info.configChanges)
+ ", newConfig=" + newConfig);
}
if ((changes&(~r.info.configChanges)) != 0) {
// Aha, the activity isn't handling the change, so DIE DIE DIE.
r.configChangeFlags |= changes;
r.startFreezingScreenLocked(r.app, globalChanges);
if (r.app == null || r.app.thread == null) {
if (DEBUG_SWITCH || DEBUG_CONFIGURATION) Slog.v(TAG,
"Switch is destroying non-running " + r);
destroyActivityLocked(r, true);
} else if (r.state == ActivityState.PAUSING) {
// A little annoying: we are waiting for this activity to
// finish pausing. Let's not do anything now, but just
// flag that it needs to be restarted when done pausing.
if (DEBUG_SWITCH || DEBUG_CONFIGURATION) Slog.v(TAG,
"Switch is skipping already pausing " + r);
r.configDestroy = true;
return true;
} else if (r.state == ActivityState.RESUMED) {
// Try to optimize this case: the configuration is changing
// and we need to restart the top, resumed activity.
// Instead of doing the normal handshaking, just say
// "restart!".
if (DEBUG_SWITCH || DEBUG_CONFIGURATION) Slog.v(TAG,
"Switch is restarting resumed " + r);
relaunchActivityLocked(r, r.configChangeFlags, true);
r.configChangeFlags = 0;
} else {
if (DEBUG_SWITCH || DEBUG_CONFIGURATION) Slog.v(TAG,
"Switch is restarting non-resumed " + r);
relaunchActivityLocked(r, r.configChangeFlags, false);
r.configChangeFlags = 0;
}
// All done... tell the caller we weren't able to keep this
// activity around.
return false;
}
// Default case: the activity can handle this new configuration, so
// hand it over. Note that we don't need to give it the new
// configuration, since we always send configuration changes to all
// process when they happen so it can just use whatever configuration
// it last got.
if (r.app != null && r.app.thread != null) {
try {
if (DEBUG_CONFIGURATION) Slog.v(TAG, "Sending new config to " + r);
r.app.thread.scheduleActivityConfigurationChanged(r);
} catch (RemoteException e) {
// If process died, whatever.
}
}
r.stopFreezingScreenLocked(false);
return true;
}
private final boolean relaunchActivityLocked(ActivityRecord r,
int changes, boolean andResume) {
List<ResultInfo> results = null;
List<Intent> newIntents = null;
if (andResume) {
results = r.results;
newIntents = r.newIntents;
}
if (DEBUG_SWITCH) Slog.v(TAG, "Relaunching: " + r
+ " with results=" + results + " newIntents=" + newIntents
+ " andResume=" + andResume);
EventLog.writeEvent(andResume ? EventLogTags.AM_RELAUNCH_RESUME_ACTIVITY
: EventLogTags.AM_RELAUNCH_ACTIVITY, System.identityHashCode(r),
r.task.taskId, r.shortComponentName);
r.startFreezingScreenLocked(r.app, 0);
try {
if (DEBUG_SWITCH) Slog.i(TAG, "Switch is restarting resumed " + r);
r.app.thread.scheduleRelaunchActivity(r, results, newIntents,
changes, !andResume, mService.mConfiguration);
// Note: don't need to call pauseIfSleepingLocked() here, because
// the caller will only pass in 'andResume' if this activity is
// currently resumed, which implies we aren't sleeping.
} catch (RemoteException e) {
return false;
}
if (andResume) {
r.results = null;
r.newIntents = null;
if (mMainStack) {
mService.reportResumedActivityLocked(r);
}
}
return true;
}
}
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