MTK平台双击Power打开Camera的简单流程

（1）Framework层Flow

Framework层的backtrace如下：

07-02 16:17:25.556  1066  2879 E dxf_onCameraLaunchGestureDetected:  at com.android.server.statusbar.StatusBarManagerService$1.onCameraLaunchGestureDetected(StatusBarManagerService.java:268)
07-02 16:17:25.556  1066  2879 E dxf_onCameraLaunchGestureDetected:     at com.android.server.GestureLauncherService.handleCameraGesture(GestureLauncherService.java:432)
07-02 16:17:25.556  1066  2879 E dxf_onCameraLaunchGestureDetected:     at com.android.server.GestureLauncherService.interceptPowerKeyDown(GestureLauncherService.java:390)
07-02 16:17:25.556  1066  2879 E dxf_onCameraLaunchGestureDetected:     at com.android.server.policy.PhoneWindowManager.interceptPowerKeyDown(PhoneWindowManager.java:1117)
07-02 16:17:25.556  1066  2879 E dxf_onCameraLaunchGestureDetected:     at com.android.server.policy.PhoneWindowManager.interceptKeyBeforeQueueing(PhoneWindowManager.java:4688)
07-02 16:17:25.556  1066  2879 E dxf_onCameraLaunchGestureDetected:     at com.android.server.wm.InputManagerCallback.interceptKeyBeforeQueueing(InputManagerCallback.java:318)
07-02 16:17:25.556  1066  2879 E dxf_onCameraLaunchGestureDetected:     at com.android.server.input.InputManagerService.interceptKeyBeforeQueueing(InputManagerService.java:1981)07-02 16:17:25.560  3058  3058 D StatusBar: Finish going to sleep before launching camera

最原始的事件触发从InputManagerService开始：

//frameworks/base/services/core/java/com/android/server/input/InputManagerService.java// Native callback.private int interceptKeyBeforeQueueing(KeyEvent event, int policyFlags) {return mWindowManagerCallbacks.interceptKeyBeforeQueueing(event, policyFlags);}

最终调用到StatusBarManagerService这里：

//frameworks/base/services/core/java/com/android/server/statusbar/StatusBarManagerService.java@Overridepublic void onCameraLaunchGestureDetected(int source) {if (mBar != null) {try {android.util.Log.e("dxf_onCameraLaunchGestureDetected", "source = " + source,new NullPointerException());mBar.onCameraLaunchGestureDetected(source);} catch (RemoteException e) {}}}

上面Framework层的逻辑如果不清楚，可以根据backtrace来追踪Code查看Flow，这里将重点的Power键单双击事件写成另外一篇文章，可以参考一下Framework层长短按Power键触发事件。

接下来这里即将调用到SystemUI当中的StatusBar当中。

//vendor/mediatek/proprietary/packages/apps/SystemUI/src/com/android/systemui/statusbar/phone/StatusBar.javapublic void onCameraLaunchGestureDetected(int source) {android.util.Log.e("dxf_onCameraLaunchGestureDetected", "source = " + source,new NullPointerException());mLastCameraLaunchSource = source;if (isGoingToSleep()) {if (DEBUG_CAMERA_LIFT) Slog.d(TAG, "Finish going to sleep before launching camera");//这里将变量mLaunchCameraOnFinishedGoingToSleep设置为true，等到后续用于判断FlowmLaunchCameraOnFinishedGoingToSleep = true;return;}if (!mNotificationPanelViewController.canCameraGestureBeLaunched()) {if (DEBUG_CAMERA_LIFT) Slog.d(TAG, "Can't launch camera right now");return;}if (!mDeviceInteractive) {mPowerManager.wakeUp(SystemClock.uptimeMillis(), PowerManager.WAKE_REASON_CAMERA_LAUNCH,"com.android.systemui:CAMERA_GESTURE");}vibrateForCameraGesture();if (source == StatusBarManager.CAMERA_LAUNCH_SOURCE_POWER_DOUBLE_TAP) {Log.i(TAG, "Camera launch");mKeyguardUpdateMonitor.onCameraLaunched();}//...
}

从Log可以看到第一次的调用都被第一个if语句拦截住了，开始执行isGoingToSleep()。

（2）SystemUI中的Flow

从上面第一次进入onCameraLaunchGestureDetected后，被判断条件拦截，进而后续又重新回调如下函数，准备重新OpenCamera。

07-02 16:17:25.646  3058  3058 E dxf_onCameraLaunchGestureDetected:  at com.android.systemui.statusbar.phone.StatusBar.onCameraLaunchGestureDetected(StatusBar.java:4162)
07-02 16:17:25.646  3058  3058 E dxf_onCameraLaunchGestureDetected:     at com.android.systemui.statusbar.phone.StatusBar$12.lambda$onFinishedGoingToSleep$0(StatusBar.java:4027)
07-02 16:17:25.646  3058  3058 E dxf_onCameraLaunchGestureDetected:     at com.android.systemui.statusbar.phone.StatusBar$12.lambda$onFinishedGoingToSleep$0$StatusBar$12(Unknown Source:0)

//vendor/mediatek/proprietary/packages/apps/SystemUI/src/com/android/systemui/statusbar/phone/StatusBar.javafinal WakefulnessLifecycle.Observer mWakefulnessObserver = new WakefulnessLifecycle.Observer() {@Overridepublic void onFinishedGoingToSleep() {mNotificationPanelViewController.onAffordanceLaunchEnded();releaseGestureWakeLock();mLaunchCameraWhenFinishedWaking = false;mDeviceInteractive = false;mWakeUpComingFromTouch = false;mWakeUpTouchLocation = null;mVisualStabilityManager.setScreenOn(false);updateVisibleToUser();updateNotificationPanelTouchState();mNotificationShadeWindowViewController.cancelCurrentTouch();if (mLaunchCameraOnFinishedGoingToSleep) {mLaunchCameraOnFinishedGoingToSleep = false;// This gets executed before we will show Keyguard, so post it in order that the state// is correct.//这里再次调用onCameraLaunchGestureDetected函数mHandler.post(() -> onCameraLaunchGestureDetected(mLastCameraLaunchSource));}// When finished going to sleep, force the status bar state to avoid stale state.updateIsKeyguard(true /* force */);}

我们再次进入到onCameraLaunchGestureDetected函数中：

//vendor/mediatek/proprietary/packages/apps/SystemUI/src/com/android/systemui/statusbar/phone/StatusBar.javapublic void onCameraLaunchGestureDetected(int source) {mLastCameraLaunchSource = source;if (isGoingToSleep()) {if (DEBUG_CAMERA_LIFT) Slog.d(TAG, "Finish going to sleep before launching camera");mLaunchCameraOnFinishedGoingToSleep = true;return;}if (!mNotificationPanelViewController.canCameraGestureBeLaunched()) {if (DEBUG_CAMERA_LIFT) Slog.d(TAG, "Can't launch camera right now");return;}if (!mDeviceInteractive) {mPowerManager.wakeUp(SystemClock.uptimeMillis(), PowerManager.WAKE_REASON_CAMERA_LAUNCH,"com.android.systemui:CAMERA_GESTURE");}vibrateForCameraGesture();if (source == StatusBarManager.CAMERA_LAUNCH_SOURCE_POWER_DOUBLE_TAP) {Log.i(TAG, "Camera launch");mKeyguardUpdateMonitor.onCameraLaunched();}if (!mStatusBarKeyguardViewManager.isShowing()) {Log.i(TAG, "dxf_launch1");//（1）这里直接调用startActivityDismissingKeyguard来startActivityAsUser（非锁屏情况下）startActivityDismissingKeyguard(KeyguardBottomAreaView.INSECURE_CAMERA_INTENT,false /* onlyProvisioned */, true /* dismissShade */,true /* disallowEnterPictureInPictureWhileLaunching */, null /* callback */, 0);} else {Log.i(TAG, "dxf_launch2");if (!mDeviceInteractive) {// Avoid flickering of the scrim when we instant launch the camera and the bouncer// comes on.mGestureWakeLock.acquire(LAUNCH_TRANSITION_TIMEOUT_MS + 1000L);}if (isWakingUpOrAwake()) {if (DEBUG_CAMERA_LIFT) Slog.d(TAG, "Launching camera");if (mStatusBarKeyguardViewManager.isBouncerShowing()) {mStatusBarKeyguardViewManager.reset(true /* hide */);}// M: Mtk add for fix unresponse when swipe lock and occluded.if (!mStatusBarKeyguardViewManager.isSecure()&& mStatusBarKeyguardViewManager.isOccluded()) {Slog.d(TAG, "Non-Secure unlock, no need to launch camera");return;}Log.i(TAG, "dxf_launch3");//（2）这里通过launchCamera最终来startActivityAsUser（锁屏情况下）mNotificationPanelViewController.launchCamera(mDeviceInteractive /* animate */, source);updateScrimController();} else {// We need to defer the camera launch until the screen comes on, since otherwise// we will dismiss us too early since we are waiting on an activity to be drawn and// incorrectly get notified because of the screen on event (which resumes and pauses// some activities)if (DEBUG_CAMERA_LIFT) Slog.d(TAG, "Deferring until screen turns on");mLaunchCameraWhenFinishedWaking = true;}}}

从这里开始SystemUI分为不同的处理流程，那是为什么呢？因为这两种处理流程主要表现在锁屏和不锁屏的情况下双击Power键的流程。

（A）非锁屏情况下

07-02 16:16:27.431  3058  3058 I StatusBar: dxf_launch1
07-02 16:16:27.431  3058  3058 E dxf_startActivityDismissingKeyguard: Intent { act=android.media.action.STILL_IMAGE_CAMERA flg=0x14000000 }
07-02 16:16:27.431  3058  3058 E dxf_startActivityDismissingKeyguard:   at com.android.systemui.statusbar.phone.StatusBar.startActivityDismissingKeyguard(StatusBar.java:2871)
07-02 16:16:27.431  3058  3058 E dxf_startActivityDismissingKeyguard:   at com.android.systemui.statusbar.phone.StatusBar.onCameraLaunchGestureDetected(StatusBar.java:4186)
07-02 16:16:27.431  3058  3058 E dxf_startActivityDismissingKeyguard:   at com.android.systemui.statusbar.phone.StatusBar$12.lambda$onFinishedGoingToSleep$0(StatusBar.java:4027)
07-02 16:16:27.431  3058  3058 E dxf_startActivityDismissingKeyguard:   at com.android.systemui.statusbar.phone.StatusBar$12.lambda$onFinishedGoingToSleep$0$StatusBar$12(Unknown Source:0)

（B）锁屏情况下

07-02 16:17:25.674  3058  3058 I StatusBar: dxf_launch2
07-02 16:17:25.674  3058  3058 D StatusBar: Launching camera
07-02 16:17:25.676  3058  3058 I StatusBar: dxf_launch3
07-02 16:17:25.685  3058  3058 E dxf_startActivityDismissingKeyguard: Intent { act=android.media.action.STILL_IMAGE_CAMERA flg=0x14000000 (has extras) }
07-02 16:17:25.685  3058  3058 E dxf_startActivityDismissingKeyguard:   at com.android.systemui.statusbar.phone.StatusBar.startActivityDismissingKeyguard(StatusBar.java:2871)
07-02 16:17:25.685  3058  3058 E dxf_startActivityDismissingKeyguard:   at com.android.systemui.statusbar.phone.StatusBar.startActivity(StatusBar.java:1896)
07-02 16:17:25.685  3058  3058 E dxf_startActivityDismissingKeyguard:   at com.android.systemui.ActivityStarterDelegate.startActivity(ActivityStarterDelegate.java:89)
07-02 16:17:25.685  3058  3058 E dxf_startActivityDismissingKeyguard:   at com.android.systemui.statusbar.phone.KeyguardBottomAreaView.launchCamera(KeyguardBottomAreaView.java:603)
07-02 16:17:25.685  3058  3058 E dxf_startActivityDismissingKeyguard:   at com.android.systemui.statusbar.phone.NotificationPanelViewController$KeyguardAffordanceHelperCallback.onAnimationToSideStarted(NotificationPanelViewController.java:3370)
07-02 16:17:25.685  3058  3058 E dxf_startActivityDismissingKeyguard:   at com.android.systemui.statusbar.phone.KeyguardAffordanceHelper.fling(KeyguardAffordanceHelper.java:356)
07-02 16:17:25.685  3058  3058 E dxf_startActivityDismissingKeyguard:   at com.android.systemui.statusbar.phone.KeyguardAffordanceHelper.launchAffordance(KeyguardAffordanceHelper.java:534)
07-02 16:17:25.685  3058  3058 E dxf_startActivityDismissingKeyguard:   at com.android.systemui.statusbar.phone.NotificationPanelViewController.launchCamera(NotificationPanelViewController.java:2761)
07-02 16:17:25.685  3058  3058 E dxf_startActivityDismissingKeyguard:   at com.android.systemui.statusbar.phone.StatusBar.onCameraLaunchGestureDetected(StatusBar.java:4208)
07-02 16:17:25.685  3058  3058 E dxf_startActivityDismissingKeyguard:   at com.android.systemui.statusbar.phone.StatusBar$12.lambda$onFinishedGoingToSleep$0(StatusBar.java:4027)
07-02 16:17:25.685  3058  3058 E dxf_startActivityDismissingKeyguard:   at com.android.systemui.statusbar.phone.StatusBar$12.lambda$onFinishedGoingToSleep$0$StatusBar$12(Unknown Source:0)

进而最终都会调用到StatusBar当中的startActivityDismissingKeyguard函数。

public void startActivityDismissingKeyguard(final Intent intent, boolean onlyProvisioned,final boolean dismissShade, final boolean disallowEnterPictureInPictureWhileLaunching,final Callback callback, int flags) {android.util.Log.e("dxf_startActivityDismissingKeyguard", intent.toString(),new NullPointerException());//...intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TOP);intent.addFlags(flags);int result = ActivityManager.START_CANCELED;result = ActivityTaskManager.getService().startActivityAsUser(null, mContext.getBasePackageName(), mContext.getAttributionTag(),intent,intent.resolveTypeIfNeeded(mContext.getContentResolver()),null, null, 0, Intent.FLAG_ACTIVITY_NEW_TASK, null,options.toBundle(), UserHandle.CURRENT.getIdentifier());
}

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MTK平台双击Power打开Camera的简单流程

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