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前言

     最近有项目过程中，有做app的同事反馈，三方应用无法监听关机广播。特地研究了下关机广播为啥监听不到。

1.原因：发送关机广播的类是ShutdownThread.java，添加了flag:Intent.FLAG_RECEIVER_FOREGROUND | Intent.FLAG_RECEIVER_REGISTERED_ONLY,表示只有在代码中动态注册，并且是前台服务和应用才能收到，所以在AndroidManifest.xml注册无法收到关机广播，后台服务中动态注册也无法收到。

2.前台服务注册关机广播。

  （1）.启动前台服务： 

public class BootCompleteReceiver extends BroadcastReceiver {private static final String TAG = "BootCompleteReceiver";@Overridepublic void onReceive(Context context, Intent intent) {if (intent != null) {if (Intent.ACTION_BOOT_COMPLETED.equals(intent.getAction())) {
//                ComponentName powerService = new ComponentName("com.android.mytest", "com.android.mytest.PowerService");
//                Intent mIntent = new Intent();
//                mIntent.setComponent(powerService);Intent powerServiceIntent = new Intent(context, PowerService.class);context.startForegroundService(powerServiceIntent);Log.d(TAG, "startForegroundService");}}}
}

（2）、添加前台服务权限，配置相关属性：

 权限：

 <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" /><uses-permission android:name="android.permission.INTERNET" /><uses-permission android:name="android.permission.FOREGROUND_SERVICE" />

服务配置:

 <serviceandroid:name=".PowerService"android:foregroundServiceType="mediaPlayback"android:enabled="true"android:exported="false" ><intent-filter><action android:name="com.gwm.car.PowerService"/></intent-filter></service>

（3）.注册关机广播：

package com.android.mytest;import android.app.Notification;
import android.app.NotificationChannel;
import android.app.NotificationManager;
import android.app.Service;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.IBinder;
import android.util.Log;import androidx.annotation.Nullable;public class PowerService extends Service {private static final String TAG = "PowerService";public ShutdownBroadcastReceiver mShutdownBroadcastReceiver;@Overridepublic void onCreate() {super.onCreate();Log.d(TAG, "onCreate");mShutdownBroadcastReceiver = new ShutdownBroadcastReceiver();}private Notification getNotification() {NotificationChannel channel = new NotificationChannel("channel_id", "channel_name", NotificationManager.IMPORTANCE_DEFAULT);NotificationManager manager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);if (manager != null) {manager.createNotificationChannel(channel);}return new Notification.Builder(this, "channel_id").setContentTitle("shutdown").setContentText("Listening for shutdown")
//                .setAutoCancel(true).setSmallIcon(R.mipmap.ic_launcher_round).build();}@Overridepublic int onStartCommand(Intent intent, int flags, int startId) {Log.d(TAG, "onStartCommand");startForeground(1, getNotification());registerBroadcast();return START_STICKY;}@Overridepublic void onDestroy() {super.onDestroy();Log.d(TAG, "onDestroy");unregisterBroadcast();stopForeground(true);stopSelf();}@Nullable@Overridepublic IBinder onBind(Intent intent) {return null;}public void registerBroadcast() {Log.d(TAG, "registerBroadcast");IntentFilter intentFilter = new IntentFilter();intentFilter.addAction((Intent.ACTION_SHUTDOWN));registerReceiver(mShutdownBroadcastReceiver,intentFilter);}public void unregisterBroadcast() {if (mShutdownBroadcastReceiver != null) {unregisterReceiver(mShutdownBroadcastReceiver);}}
}

（4）.关机广播实现

package com.android.mytest;import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.util.Log;public class ShutdownBroadcastReceiver extends BroadcastReceiver {private static final String TAG = "ShutdownBroadcastReceiver";@Overridepublic void onReceive(Context context, Intent intent) {Log.d(TAG, "zjy onReceive intent:"+intent);}
}

（5）.本地验证：