android 开机广播是在哪里发出的

android 开机广播是在哪里发出的

做 android 开发都知道有开机广播这回事，具体从哪里发出的呢？
追溯下源码，在 AN 9.0 frameworks/ 目录下搜索 ACTION_BOOT_COMPLETED 得知，
在 frameworks/base/services/core/java/com/android/server/am/UserController.java 文件里，
具体方法是 finishUserUnlockedCompleted 。

private void finishUserUnlockedCompleted(UserState uss) {synchronized (mLock) {// 省略其他Slog.i(TAG, "Sending BOOT_COMPLETE user #" + userId);// Do not report secondary users, runtime restarts or first boot/upgradeif (userId == UserHandle.USER_SYSTEM&& !mInjector.isRuntimeRestarted() && !mInjector.isFirstBootOrUpgrade()) {int uptimeSeconds = (int) (SystemClock.elapsedRealtime() / 1000);MetricsLogger.Context(), "framework_boot_completed",uptimeSeconds);}final Intent bootIntent = new Intent(Intent.ACTION_BOOT_COMPLETED, null);bootIntent.putExtra(Intent.EXTRA_USER_HANDLE, userId);bootIntent.addFlags(Intent.FLAG_RECEIVER_NO_ABORT| Intent.FLAG_RECEIVER_INCLUDE_BACKGROUND);mInjector.broadcastIntentLocked(bootIntent, null, new IIntentReceiver.Stub() {@Overridepublic void performReceive(Intent intent, int resultCode, String data,Bundle extras, boolean ordered, boolean sticky, int sendingUser)throws RemoteException {Slog.i(UserController.TAG, "Finished processing BOOT_COMPLETED for u" + userId);}}, 0, null, null,new String[] { android.Manifest.permission.RECEIVE_BOOT_COMPLETED },AppOpsManager.OP_NONE, null, true, false, MY_PID, SYSTEM_UID, userId);}
}

指定了 flag 为 Intent.FLAG_RECEIVER_NO_ABORT ，无法被截断；
需要声明权限 android.Manifest.permission.RECEIVE_BOOT_COMPLETED ；