Android KK开机按power键不能灭屏，须过会儿才能灭屏

1             filter = new IntentFilter();
2             filter.addAction(Intent.ACTION_BOOT_COMPLETED);
3             mContext.registerReceiver(new BootCompletedReceiver(), filter, null, mHandler);

 1     private final class BootCompletedReceiver extends BroadcastReceiver {
 2         @Override
 3         public void onReceive(Context context, Intent intent) {
 4             if (DEBUG_SPEW) {
 5                 Slog.d(TAG, "BootCompletedReceiver.");
 6             }
 7             // This is our early signal that the system thinks it has finished booting.
 8             // However, the boot animation may still be running for a few more seconds
 9             // since it is ultimately in charge of when it terminates.
10             // Defer transitioning into the boot completed state until the animation exits.
11             // We do this so that the screen does not start to dim prematurely before
12             // the user has actually had a chance to interact with the device.
13             startWatchingForBootAnimationFinished();
14         }
15     }

1         @Override
2         public void handleMessage(Message msg) {
3             switch (msg.what) {
4                 ……
5                 case MSG_CHECK_IF_BOOT_ANIMATION_FINISHED:
6                     checkIfBootAnimationFinished();
7                     break;
8             }
9         }

 1     private void checkIfBootAnimationFinished() {
 2         if (DEBUG) {
 3             Slog.d(TAG, "Check if boot animation finished...");
 4         }
 5         // 检查是否还在跑 bootanim
 6         if (SystemService.isRunning(BOOT_ANIMATION_SERVICE)) {
 7             mHandler.sendEmptyMessageDelayed(MSG_CHECK_IF_BOOT_ANIMATION_FINISHED,
 8                     BOOT_ANIMATION_POLL_INTERVAL);
 9             return;
10         }
11 
12         synchronized (mLock) {
13             if (!mBootCompleted) {
14                 Slog.i(TAG, "Boot animation finished.");
15                 handleBootCompletedLocked();
16             }
17         }
18     }

 1     private void handleBootCompletedLocked() {
 2         final long now = SystemClock.uptimeMillis();
 3         mBootCompleted = true;
 4         mDirty |= DIRTY_BOOT_COMPLETED;
 5         userActivityNoUpdateLocked(
 6                 now, PowerManager.USER_ACTIVITY_EVENT_OTHER, 0, Process.SYSTEM_UID);
 7         if ( mWakefulness == WAKEFULNESS_AWAKE ) {
 8             mNotifier.onWakeUpStarted();
 9         }
10         updatePowerStateLocked();
11     }