我有一个音乐应用程序,我想在通知栏上添加一些操作按钮。
我尝试了类似于这样的东西:
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
NotificationReceiver
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;
}
}
}
}
}
结构大致如下:
-MusicService extends Service
--NotificationReciever extends BroadcastReceiver
我的清单文件包含以下接收器:
<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器时,通知会弹出带有按钮,但这些按钮似乎无法触发
onReceive
函数? 我错过了什么?更新:
按照Hasif Sayed的回答,我似乎发现了一个错误。
通过谷歌搜索,我发现我必须使用静态类或在父类中注册/注销。java.lang.RuntimeException:无法实例化接收器com.example.tilak.imusicplay.MusicService $ NotificationReciever:java.lang.InstantiationException:java.lang.Class没有零参数构造函数
所以这就是我做的事情:
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);
现在我不再遇到上述错误,但是
onReceive
又不起作用了。