android Back键处理流程及Log分析
2024-06-06 05:16:15
Galley界面按返回整体流程：
- FWK响应back键，在PhoneWindowManager里面会拦截back键，然后通过binder调用ATMS的finishActivity方法
- 在finishActivityLocked里面，会先调整当前focus栈，寻找下一个focus，由于应用是从桌面启动的，下一个栈是Home所有的栈，满足条件，将Home栈移到顶部
- GalleryActivity 从RESUMED ==> PAUSING ==> PAUSED ==> STOPPING
- Launcher 状态从STOPPED ==> RESUMED，然后触发IDLE回收
- GalleryActivity 状态从STOPPING ==> FINISHING ==> DESTROYING ==> DESTROYED
- GalleryActivity 所有的栈被回收，从ActivityDisplay remove
1.PhoneWindowManager响应back键流程
08-22 18:41:32.383 1245 1435 D WindowManager: interceptKeyTq keycode=4 interactive=true keyguardActive=false policyFlags=2b000002
08-22 18:41:32.383 1245 1435 D WindowManager: java.lang.Throwable
08-22 18:41:32.383 1245 1435 D WindowManager: at com.android.server.policy.PhoneWindowManager.interceptKeyBeforeQueueing(PhoneWindowManager.java:3693)
08-22 18:41:32.383 1245 1435 D WindowManager: at com.android.server.wm.InputManagerCallback.interceptKeyBeforeQueueing(InputManagerCallback.java:164)
08-22 18:41:32.383 1245 1435 D WindowManager: at com.android.server.input.InputManagerService.interceptKeyBeforeQueueing(InputManagerService.java:1852)
08-22 18:41:32.383 1245 1435 D WindowManager: at com.android.server.input.InputManagerService.nativeInjectInputEvent(Native Method)
08-22 18:41:32.383 1245 1435 D WindowManager: at com.android.server.input.InputManagerService.injectInputEventInternal(InputManagerService.java:635)
08-22 18:41:32.383 1245 1435 D WindowManager: at com.android.server.input.InputManagerService.injectInputEvent(InputManagerService.java:617)
08-22 18:41:32.383 1245 1435 D WindowManager: at android.hardware.input.IInputManager$Stub.onTransact(IInputManager.java:392)
08-22 18:41:32.383 1245 1435 D WindowManager: at android.os.Binder.execTransactInternal(Binder.java:1021)
08-22 18:41:32.383 1245 1435 D WindowManager: at android.os.Binder.execTransact(Binder.java:994)
BACK键的定义：
/** Key code constant: Back key. */
public static final int KEYCODE_BACK = 4;
back键pressed打印
08-22 19:01:20.850 1315 1348 D AutofillManagerService: onBackKeyPressed()
2.在finishActivityLocked里面，会先调整当前focus栈，将Home栈移到顶部
requestFinishActivityLocked方法中，会打印调用的原因，reason=app-request
08-22 18:41:32.484 1245 1278 V ActivityTaskManager: Finishing activity token=Token{b411460 ActivityRecord{8400448 u0 com.android.gallery3d/.app.GalleryActivity t99}} r=, result=0, data=null, reason=app-request
08-22 18:41:32.485 1245 1278 D ActivityTaskManager: moveActivityStackToFront: activity=ActivityRecord{7f534c6 u0 com.android.launcher3/.Launcher t98}
08-22 18:41:32.487 1245 1278 V ActivityTaskManager: Sending position change to ActivityRecord{8400448 u0 com.android.gallery3d/.app.GalleryActivity t99 f}, onTop: false
重点看一下finishActivityLocked，在此方法中，调用了adjustFocusedActivityStack来调整focus栈。
ActivityRecord.moveFocusableActivityToTop,此方法会打印moveActivityStackToFront，此时将Launcher 所有的stack移动顶部
final boolean finishActivityLocked(ActivityRecord r, int resultCode, Intent resultData,String reason, boolean oomAdj, boolean pauseImmediately) {try {r.makeFinishingLocked();// 1.先在当前的TaskRecord里面找是否还有ActivityRecord，final TaskRecord task = r.getTaskRecord();task.taskId, r.shortComponentName, reason);final ArrayList<ActivityRecord> activities = task.mActivities;final int index = activities.indexOf(r);r.pauseKeyDispatchingLocked();// 2.调整焦点stack,adjustFocusedActivityStack(r, "finishActivity");// 3. Tell window manager to prepare for this one to be removed.r.setVisibility(false);
}
3.GalleryActivity 从RESUMED ==> PAUSING ==> PAUSED ==> STOPPING
GalleryActivity 状态 from:RESUMED to:PAUSING
08-22 18:41:32.503 1245 1278 V ActivityTaskManager: State movement: ActivityRecord{8400448 u0 com.android.gallery3d/.app.GalleryActivity t99 f} from:RESUMED to:PAUSING reason:startPausingLocked
08-22 18:41:32.503 1245 1278 V ActivityTaskManager: java.lang.Throwable
08-22 18:41:32.503 1245 1278 V ActivityTaskManager: at com.android.server.wm.ActivityRecord.setState(ActivityRecord.java:1857)
08-22 18:41:32.503 1245 1278 V ActivityTaskManager: at com.android.server.wm.ActivityStack.startPausingLocked(ActivityStack.java:1690)
08-22 18:41:32.503 1245 1278 V ActivityTaskManager: at com.android.server.wm.ActivityStack.finishActivityLocked(ActivityStack.java:4046)
08-22 18:41:32.503 1245 1278 V ActivityTaskManager: at com.android.server.wm.ActivityStack.finishActivityLocked(ActivityStack.java:3980)
08-22 18:41:32.503 1245 1278 V ActivityTaskManager: at com.android.server.wm.ActivityStack.requestFinishActivityLocked(ActivityStack.java:3822)
08-22 18:41:32.503 1245 1278 V ActivityTaskManager: at com.android.server.wm.ActivityTaskManagerService.finishActivity(ActivityTaskManagerService.java:1629)
08-22 18:41:32.503 1245 1278 V ActivityTaskManager: at android.app.IActivityTaskManager$Stub.onTransact(IActivityTaskManager.java:1928)
08-22 18:41:32.503 1245 1278 V ActivityTaskManager: at android.os.Binder.execTransactInternal(Binder.java:1021)
08-22 18:41:32.503 1245 1278 V ActivityTaskManager: at android.os.Binder.execTransact(Binder.java:994)
GalleryActivity 状态 from:PAUSING to:PAUSED
08-22 18:41:32.531 1245 1435 V ActivityTaskManager: State movement: ActivityRecord{8400448 u0 com.android.gallery3d/.app.GalleryActivity t99 f} from:PAUSING to:PAUSED reason:completePausedLocked
08-22 18:41:32.531 1245 1435 V ActivityTaskManager: java.lang.Throwable
08-22 18:41:32.531 1245 1435 V ActivityTaskManager: at com.android.server.wm.ActivityRecord.setState(ActivityRecord.java:1857)
08-22 18:41:32.531 1245 1435 V ActivityTaskManager: at com.android.server.wm.ActivityStack.completePauseLocked(ActivityStack.java:1801)
08-22 18:41:32.531 1245 1435 V ActivityTaskManager: at com.android.server.wm.ActivityStack.activityPausedLocked(ActivityStack.java:1770)
08-22 18:41:32.531 1245 1435 V ActivityTaskManager: at com.android.server.wm.ActivityTaskManagerService.activityPaused(ActivityTaskManagerService.java:1714)
08-22 18:41:32.531 1245 1435 V ActivityTaskManager: at android.app.IActivityTaskManager$Stub.onTransact(IActivityTaskManager.java:1981)
08-22 18:41:32.531 1245 1435 V ActivityTaskManager: at android.os.Binder.execTransactInternal(Binder.java:1021)
08-22 18:41:32.531 1245 1435 V ActivityTaskManager: at android.os.Binder.execTransact(Binder.java:994)
在activityPausedLocked方法里面，
final void activityPausedLocked(IBinder token, boolean timeout) {if (DEBUG_PAUSE) Slog.v(TAG_PAUSE,"Activity paused: token=" + token + ", timeout=" + timeout);final ActivityRecord r = isInStackLocked(token);if (r != null) {mHandler.removeMessages(PAUSE_TIMEOUT_MSG, r);// 此时mPausingActivity == r，在调用completePauseLocked时传入参数resumeNext为trueif (mPausingActivity == r) {try {completePauseLocked(true /* resumeNext */, null /* resumingActivity */);} finally {mService.mWindowManager.continueSurfaceLayout();}}
4.Launcher 状态从STOPPED ==> RESUMED，然后触发IDLE回收
在finishActivityLocked方法里面，将Launcher所有的栈移到顶部，然后resumeTopActivityInnerLocked，将Launcher 状态从 from:STOPPED to:RESUMED
08-22 18:41:32.537 1245 1435 V ActivityTaskManager: State movement: ActivityRecord{7f534c6 u0 com.android.launcher3/.Launcher t98} from:STOPPED to:RESUMED reason:resumeTopActivityInnerLocked
08-22 18:41:32.537 1245 1435 V ActivityTaskManager: java.lang.Throwable
08-22 18:41:32.537 1245 1435 V ActivityTaskManager: at com.android.server.wm.ActivityRecord.setState(ActivityRecord.java:1857)
08-22 18:41:32.537 1245 1435 V ActivityTaskManager: at com.android.server.wm.ActivityStack.resumeTopActivityInnerLocked(ActivityStack.java:2909)
08-22 18:41:32.537 1245 1435 V ActivityTaskManager: at com.android.server.wm.ActivityStack.resumeTopActivityUncheckedLocked(ActivityStack.java:2578)
08-22 18:41:32.537 1245 1435 V ActivityTaskManager: at com.android.server.wm.RootActivityContainer.resumeFocusedStacksTopActivities(RootActivityContainer.java:1159)
08-22 18:41:32.537 1245 1435 V ActivityTaskManager: at com.android.server.wm.ActivityStack.completePauseLocked(ActivityStack.java:1843)
08-22 18:41:32.537 1245 1435 V ActivityTaskManager: at com.android.server.wm.ActivityStack.activityPausedLocked(ActivityStack.java:1770)
08-22 18:41:32.537 1245 1435 V ActivityTaskManager: at com.android.server.wm.ActivityTaskManagerService.activityPaused(ActivityTaskManagerService.java:1714)
08-22 18:41:32.537 1245 1435 V ActivityTaskManager: at android.app.IActivityTaskManager$Stub.onTransact(IActivityTaskManager.java:1981)
08-22 18:41:32.537 1245 1435 V ActivityTaskManager: at android.os.Binder.execTransactInternal(Binder.java:1021)
08-22 18:41:32.537 1245 1435 V ActivityTaskManager: at android.os.Binder.execTransact(Binder.java:994)
08-22 19:01:20.885 2835 2835 V Activity: onPause com.android.gallery3d.app.GalleryActivity@1dab85a
08-22 19:01:20.898 2835 2835 D ActivityThread: setState newLifecycleState = 4
5.GalleryActivity 状态从STOPPING ==> FINISHING ==> DESTROYING ==> DESTROYED
GalleryActivity 状态from:PAUSED to:STOPPING
08-22 18:41:32.532 1245 1435 V ActivityTaskManager: State movement: ActivityRecord{8400448 u0 com.android.gallery3d/.app.GalleryActivity t99 f} from:PAUSED to:STOPPING reason:finishCurrentActivityLocked
08-22 18:41:32.532 1245 1435 V ActivityTaskManager: java.lang.Throwable
08-22 18:41:32.532 1245 1435 V ActivityTaskManager: at com.android.server.wm.ActivityRecord.setState(ActivityRecord.java:1857)
08-22 18:41:32.532 1245 1435 V ActivityTaskManager: at com.android.server.wm.ActivityStack.finishCurrentActivityLocked(ActivityStack.java:4125)
08-22 18:41:32.532 1245 1435 V ActivityTaskManager: at com.android.server.wm.ActivityStack.completePauseLocked(ActivityStack.java:1804)
08-22 18:41:32.532 1245 1435 V ActivityTaskManager: at com.android.server.wm.ActivityStack.activityPausedLocked(ActivityStack.java:1770)
08-22 18:41:32.532 1245 1435 V ActivityTaskManager: at com.android.server.wm.ActivityTaskManagerService.activityPaused(ActivityTaskManagerService.java:1714)
08-22 18:41:32.532 1245 1435 V ActivityTaskManager: at android.app.IActivityTaskManager$Stub.onTransact(IActivityTaskManager.java:1981)
08-22 18:41:32.532 1245 1435 V ActivityTaskManager: at android.os.Binder.execTransactInternal(Binder.java:1021)
08-22 18:41:32.532 1245 1435 V ActivityTaskManager: at android.os.Binder.execTransact(Binder.java:994)
/在resumeTopActivityInnerLocked方法里面，会通过ResumeActivityItem调用ActivityThread.handleResumeActivity方法，触发Looper.myQueue().addIdleHandler(new Idler()); 回收空闲的Activity
08-22 18:41:32.562 1245 1296 V ActivityTaskManager: Activity idle: null
08-22 18:41:32.562 1245 1296 D ActivityTaskManager: allResumedActivitiesIdle: stack=0 ActivityRecord{7f534c6 u0 com.android.launcher3/.Launcher t98} not idle
08-22 18:41:32.562 1245 1296 V ActivityTaskManager: Stopping ActivityRecord{8400448 u0 com.android.gallery3d/.app.GalleryActivity t99 f}: nowVisible=false animating=true finishing=true
在activityIdleInternalLocked方法，startActivityPausingLocked方法中，将activity加入stopping的队列中
08-22 18:41:33.095 1245 1296 V ActivityTaskManager: State movement: ActivityRecord{8400448 u0 com.android.gallery3d/.app.GalleryActivity t99 f} from:STOPPING to:FINISHING reason:finishCurrentActivityLocked
08-22 18:41:33.095 1245 1296 V ActivityTaskManager: java.lang.Throwable
08-22 18:41:33.095 1245 1296 V ActivityTaskManager: at com.android.server.wm.ActivityRecord.setState(ActivityRecord.java:1857)
08-22 18:41:33.095 1245 1296 V ActivityTaskManager: at com.android.server.wm.ActivityStack.finishCurrentActivityLocked(ActivityStack.java:4138)
08-22 18:41:33.095 1245 1296 V ActivityTaskManager: at com.android.server.wm.ActivityStackSupervisor.activityIdleInternalLocked(ActivityStackSupervisor.java:1354)
08-22 18:41:33.095 1245 1296 V ActivityTaskManager: at com.android.server.wm.ActivityStackSupervisor$ActivityStackSupervisorHandler.activityIdleInternal(ActivityStackSupervisor.java:2602)
08-22 18:41:33.095 1245 1296 V ActivityTaskManager: at com.android.server.wm.ActivityStackSupervisor$ActivityStackSupervisorHandler.handleMessage(ActivityStackSupervisor.java:2637)
08-22 18:41:33.095 1245 1296 V ActivityTaskManager: at android.os.Handler.dispatchMessage(Handler.java:107)
08-22 18:41:33.095 1245 1296 V ActivityTaskManager: at android.os.Looper.loop(Looper.java:214)
08-22 18:41:33.095 1245 1296 V ActivityTaskManager: at android.os.HandlerThread.run(HandlerThread.java:67)
08-22 18:41:33.095 1245 1296 V ActivityTaskManager: at com.android.server.ServiceThread.run(ServiceThread.java:44)08-22 18:41:33.097 1245 1296 V ActivityTaskManager: State movement: ActivityRecord{8400448 u0 com.android.gallery3d/.app.GalleryActivity t99 f} from:FINISHING to:DESTROYING reason:destroyActivityLocked. finishing and not skipping destroy08-22 18:41:33.187 1245 1435 V ActivityTaskManager: State movement: ActivityRecord{8400448 u0 com.android.gallery3d/.app.GalleryActivity t99 f} from:DESTROYING to:DESTROYED reason:removeActivityFromHistoryLocked08-22 18:41:33.192 1245 1435 I ActivityTaskManager: removeTask: removing stack=ActivityStack{6940ec7 stackId=1 type=standard mode=fullscreen visible=false translucent=true, 0 tasks}
08-22 18:41:33.200 1245 1435 V ActivityTaskManager: removeChild: detaching ActivityStack{6940ec7 stackId=1 type=standard mode=fullscreen visible=false translucent=true, 0 tasks} from displayId=0
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