不调用来自BroadcastReceiver的onReceive

Question

我有一个音乐应用程序，我试图在通知栏上添加一些操作按钮。

我试过这样的事情：

 public void onPrepared(MediaPlayer mediaPlayer) {
    mediaPlayer.start();
    Intent onPreparedIntent=new Intent("MEDIA_PLAYER_PREPARED").putExtra("CURR_SONG",songposn);
    LocalBroadcastManager.getInstance(this).sendBroadcast(onPreparedIntent);
    Intent notintent = new Intent(this, MainActivity.class).addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
    Notification.Builder builder=new Notification.Builder(this);
    PendingIntent pendingIntent=PendingIntent.getActivity(this,0,notintent,PendingIntent.FLAG_UPDATE_CURRENT);
    PendingIntent prevPendingIntent=PendingIntent.getActivity
            (this,1,new Intent().setAction("PREVIOUS"),PendingIntent.FLAG_UPDATE_CURRENT);
    PendingIntent pausePendingIntent=PendingIntent.getActivity
            (this,2,new Intent().setAction("PAUSE"),PendingIntent.FLAG_UPDATE_CURRENT);
    PendingIntent nextPendingIntent=PendingIntent.getActivity
            (this,3,new Intent().setAction("NEXT"),PendingIntent.FLAG_UPDATE_CURRENT);;
    builder.setContentIntent(pendingIntent).setSmallIcon(R.drawable.playicon)
            .addAction(R.drawable.back, "Previous", prevPendingIntent)
            .addAction(R.drawable.playsmall, "Pause", pausePendingIntent)
            .addAction(R.drawable.forw, "Next", nextPendingIntent)
            .setTicker(songArtist)
            .setOngoing(true).setContentTitle(songTitle).setContentText(songArtist);

    Notification not=builder.build();
    startForeground(MusicService.NOTIFY_ID,not);

}

我在这个服务中声明了一个NotificationReciever类

public class NotificationReciever extends BroadcastReceiver{
    @Override
    public void onReceive(Context context, Intent intent) {
        Log.e("here","here");
       String action=intent.getAction();
       if(action!=null){
           switch (action){
               case "PREVIOUS":{
                   playPrev();
                   break;
               }
               case "PAUSE":{
                   pausePlayer();
                   LocalBroadcastManager.getInstance(MusicService.this).sendBroadcast(new Intent("STOP_THREAD"));
                   break;
               }
               case "NEXT":{
                   playNext();
                   break;
               }
           }
       }
    }
}

结构看起来像这样：

-MusicService extends Service 
    --NotificationReciever extends BroadcastReceiver

我的清单文件包含这样的收件人：

 <receiver  android:name=".MusicService$NotificationReciever">
        <intent-filter>
            <action android:name="PREVIOUS"/>
            <action android:name="PAUSE"/>
            <action android:name="NEXT"/>
        </intent-filter>
    </receiver>

当我运行我的音乐播放时，通知会出现按钮，但它们似乎没有触发onReceive功能？

我在这里错过了什么？

更新：

跟着hasif说回答，我似乎发现了一个错误

java.lang.RuntimeException：无法实例化接收器com.example.tilak.imusicplay.MusicService $ NotificationReciev er：java.lang.InstantiationException：java.lang.Class没有零参数构造函数

谷歌搜索它，我发现我必须使用静态类或我必须在父类中注册/取消注册。

所以这就是我做的：

public void onCreate() {
        super.onCreate();
        //
        LocalBroadcastManager.getInstance(this).registerReceiver(
                new NotificationReciever(),new IntentFilter("PREVIOUS"));
        LocalBroadcastManager.getInstance(this).registerReceiver(
                new NotificationReciever(),new IntentFilter("PAUSE"));
        LocalBroadcastManager.getInstance(this).registerReceiver(
                new NotificationReciever(),new IntentFilter("NEXT"));
    }

---

PendingIntent prevPendingIntent=PendingIntent.getBroadcast
                (this,1,new Intent().setAction("PREVIOUS"),PendingIntent.FLAG_UPDATE_CURRENT);
        PendingIntent pausePendingIntent=PendingIntent.getBroadcast
                (this,2,new Intent().setAction("PAUSE"),PendingIntent.FLAG_UPDATE_CURRENT);
        PendingIntent nextPendingIntent=PendingIntent.getBroadcast
                (this,3,new Intent().setAction("NEXT"),PendingIntent.FLAG_UPDATE_CURRENT);

现在我没有得到上面这个错误，但是onReceive再也没有了。

Answer 1

实际上，当您单击暂停 ， 上一个和下一个按钮时未调用广播接收器的原因是，您已将挂起的意图设置为触发一个活动 ，而您必须设置挂起的意图以触发一个boradcast

而不是这段代码

PendingIntent nextPendingIntent=PendingIntent.getActivity
            (this,3,new Intent().setAction("NEXT"),PendingIntent.FLAG_UPDATE_CURRENT);;

你必须像这样纠正它

PendingIntent nextPendingIntent=PendingIntent.getBroadcast
            (this,3,new Intent().setAction("NEXT"),PendingIntent.FLAG_UPDATE_CURRENT);;

在您编写的所有三个待处理的意图代码中进行更正

UPDATE

您仍然没有在广播接收器中接收广播的原因是因为您正在将接收器注册为LocalBroadCast

与PendingIntent 一起使用时， LocalBroadcast将不会收到广播

所以请删除此行

LocalBroadcastManager.getInstance(this).registerReceiver(
                new NotificationReciever(),new IntentFilter("PREVIOUS"));
        LocalBroadcastManager.getInstance(this).registerReceiver(
                new NotificationReciever(),new IntentFilter("PAUSE"));
        LocalBroadcastManager.getInstance(this).registerReceiver(
                new NotificationReciever(),new IntentFilter("NEXT"));

相反，您只需在Manifest.xml文件中注册 接收器

或者您可以在代码中注册为

NotificationReciever mReciever = new NotificationReciever();

this.registerReceiver(
                mReciever,new IntentFilter("PREVIOUS"));
this.registerReceiver(
                mReciever,new IntentFilter("PAUSE"));
this.registerReceiver(
                mReciever,new IntentFilter("NEXT"));

但如果您以编程方式注册，请确保在服务被销毁时取消注册 。 否则，您可能会泄漏BroadcastReceiver对象