Question

我正在做一个包含主要活动和2个服务的声音应用程序，在mainActivity中我可以控制是否通过主要活动上的按钮手动播放或暂停音乐（所以你可以在屏幕上看到它）启动一个激活/停止媒体播放器的服务。此外，我有一个媒体播放器控制通知在其他服务中控制播放/停止在后台。问题是我需要在后台使用主要活动的主要控件来协调通知，例如当我放入锁屏（播放音乐时）并按下通知上的停止时，音乐不会停止因为在主要活动中，媒体播放器的服务继续启用。因此，我需要知道通知是否在主要活动中播放音乐以进行布尔值（如果通知停止音乐，我希望de mediaplayer服务停止播放音乐）。谢谢你们！这是我的通知代码：

 public class Notificaciones extends Service {
public static final String ACTION_PLAY = "action_play";
public static final String ACTION_PAUSE = "action_pause";
public static final String ACTION_REWIND = "action_rewind";
public static final String ACTION_FAST_FORWARD = "action_fast_forward";
public static final String ACTION_NEXT = "action_next";
public static final String ACTION_PREVIOUS = "action_previous";
public static final String ACTION_STOP = "action_stop";
public static final String ACTION_BAR = "action_bar";

private MediaSession mSession;
private MediaSessionManager mManager;
private MediaController mController;
private MediaPlayer mMediaPlayer;

@Override
public int onStartCommand(Intent intent, int flags, int startId) {


    if (mManager == null) {
        mMediaPlayer = new MediaPlayer();
        mSession = new MediaSession(getApplicationContext(), "example");
        mController = new MediaController(getApplicationContext(), mSession.getSessionToken());
        mSession.setCallback(new MediaSession.Callback() {

            @Override
            public void onPlay() {
                super.onPlay();
                Log.e("MyServiceClass", "onPlay");
                buildNotification(generateAction(android.R.drawable.ic_media_pause, "Pause", ACTION_PAUSE));
            }

            @Override
            public void onPause() {
                super.onPause();
                Log.e("MyServiceClass", "onPause");
                buildNotification(generateAction(android.R.drawable.ic_media_play, "Play", ACTION_PLAY));

            }

            @Override
            public void onSkipToNext() {
                super.onSkipToNext();
                buildNotification(generateAction(android.R.drawable.ic_media_pause, "Pause", ACTION_PAUSE));
            }

            @Override
            public void onFastForward() {
                super.onFastForward();


            }

            @Override
            public void onRewind() {
                super.onRewind();
            }

            @Override
            public void onStop() {
                super.onStop();
                Log.e("MyServiceClass", "onStop");
                NotificationManager notificationManager = (NotificationManager) getApplicationContext().getSystemService(Context.NOTIFICATION_SERVICE);
                notificationManager.cancel(1);
                Intent intent = new Intent(getApplicationContext(), MyServiceClass.class);
                stopService(intent);
            }
        });
    }



    handleIntent(intent);

    return START_NOT_STICKY;
}

@Override
public void onDestroy() {
    Log.e("MyServiceClass", "onStop");
    mController.getTransportControls().stop();
    NotificationManager notificationManager = (NotificationManager) getApplicationContext().getSystemService(Context.NOTIFICATION_SERVICE);
    notificationManager.cancel(1);
    Intent intent = new Intent(getApplicationContext(), MyServiceClass.class);
    stopService(intent);
    mMediaPlayer.stop();
    mMediaPlayer.release();
    stopSelf();


    super.onDestroy();
}

private void handleIntent (Intent intent){

    if (intent == null || intent.getAction()==null){
        return;
    }

    String action = intent.getAction();

    if (action.equalsIgnoreCase(ACTION_PLAY)){

        mController.getTransportControls().play();


    }else if (action.equalsIgnoreCase(ACTION_PAUSE)){

        mController.getTransportControls().pause();

    }else if (action.equalsIgnoreCase(ACTION_FAST_FORWARD)){

        mController.getTransportControls().fastForward();
    }else if (action.equalsIgnoreCase(ACTION_REWIND)){

        mController.getTransportControls().rewind();
    }else if (action.equalsIgnoreCase(ACTION_PREVIOUS)){

        mController.getTransportControls().skipToPrevious();
    }else if (action.equalsIgnoreCase(ACTION_NEXT)){

        mController.getTransportControls().skipToNext();
    }else if (action.equalsIgnoreCase(ACTION_STOP)){

        mController.getTransportControls().stop();
    }if (action.equalsIgnoreCase(ACTION_BAR)){

        mController.getTransportControls().stop();
    }



}
private android.app.Notification.Action generateAction(int icon, String title, String intentAction){

    Intent intent = new Intent(getApplicationContext(), MyServiceClass.class);
    intent.setAction(intentAction);
    PendingIntent pendingIntent = PendingIntent.getService(getApplicationContext(), 1, intent, 0);
    return new android.app.Notification.Action.Builder(icon, title, pendingIntent).build();
}

private void buildNotification(android.app.Notification.Action action){

    android.app.Notification.MediaStyle style = new android.app.Notification.MediaStyle();
    Intent intent = new Intent(getApplicationContext(), MyServiceClass.class);
    intent.setAction(ACTION_STOP);
    PendingIntent pendingIntent = PendingIntent.getService(getApplicationContext(), 1, intent, 0);
    android.app.Notification.Builder builder = new android.app.Notification.Builder(this).setSmallIcon(R.drawable.logo).setContentTitle("TEEN FM").setContentText("Adolescents.cat")
            .setDeleteIntent(pendingIntent).setStyle(style);

    builder.addAction(generateAction(android.R.drawable.ic_media_pause,  "Previous", ACTION_PREVIOUS));
    builder.addAction(generateAction(android.R.drawable.ic_media_rew,  "Rewind", ACTION_REWIND));

    builder.addAction(action);

    builder.addAction(generateAction(android.R.drawable.ic_media_ff,  "Fast Forward", ACTION_FAST_FORWARD));
   builder.addAction(generateAction(android.R.drawable.ic_media_next, "Next", ACTION_NEXT));
    style.setShowActionsInCompactView(0, 1, 2, 3, 4);
    NotificationManager notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
    notificationManager.notify(1, builder.build());


}

@Override
public boolean onUnbind(Intent intent) {
    mSession.release();
    return super.onUnbind(intent);
}

@Nullable
@Override
public IBinder onBind(Intent intent) {
    return null;
}

}

Answer 1

您应该在MainActivity中将MediaPlayer声明为静态对象，然后从Notificaciones服务中调用它。

private static MediaPlayer mMediaPlayer;

MainActivity main;

当你想要停止时，你应该做下一件事：

main=new MainActivity();
main.mMediaPlayer.stop

//这是一个例子，我不知道你的玩家是如何工作的。因为如果您正在为MediaPlayer创建一个实例，那么您永远不会从服务中停止它。 MediaPlayer服务是一个实例，而Activity MediaPlayer是另一个实例。

如果您需要更多帮助我。让我知道。祝你有愉快的一天！

如何知道媒体播放器控制通知是否正在播放音乐？

1 个答案: