在收到悬而未决的意图后，前景服务被破坏

Question

我正在尝试为Android编写音乐播放器，并使用前景服务来运行音乐播放器。我正在将UI控件从UI控件发送到服务以播放歌曲。收到意图后，立即调用OnstartCommand和Ondestroy。我不确定如何停止通话。

我尝试将未决意图更改为starterVice/contextCompat.startforegroundservice，但问题仍然存在。

服务：

import android.app.Service;
public class PlayerService extends Service{
private TransportControls transportControls;
@Override
  public int onStartCommand(Intent intent, int flags, int startId) {
    if (mediaSessionManager == null) {
      initMediaSession();
    }
    handleIntent(intent);
    return START_STICKY;
  }
private initMediaSession(){
     ...
     transportControls = mediaSession.getController().getTransportControls();
     mediaSession.setCallback(new MediaSessionCompat.Callback() {
      // Implement callbacks
      @Override
      public void onPlay() {
        play();
      }
     ...
  }
  handleIntent(Intent intent){
     // Initial checks
     if(/* action in intent is play*/) transportControls.play();
  }

  private void play(SongInfo songInfo){
     ...
      buildNotificaiton(//play action);
  }
  private void buildNotification(){
NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(
        this, "default").setContentIntent(intent)
        .setVisibility(NotificationCompat.VISIBILITY_PUBLIC)
        .setStyle(new MediaStyle()
            .setMediaSession(mediaSession.getSessionToken())
            .setShowActionsInCompactView(0, 1, 2))
        .setContentText(StringUtils.parseArtists(songInfo.artists()))
        .setContentTitle(songInfo.displayName())
        .setContentInfo(songInfo.album())
        .setSound(null);
    NotificationManager notificationManager = (NotificationManager) getSystemService(
        Context.NOTIFICATION_SERVICE);
    if (notificationManager == null) {
      return;
    }
    if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {
      NotificationChannel channel = new NotificationChannel("default",
          "Bhatki media notification",
          NotificationManager.IMPORTANCE_HIGH);
      channel.setDescription(
          "Notification displayed when music is being played. This notification is "
              + "required for the music to play.");
      notificationManager.createNotificationChannel(channel);
    }
    // Execution is reaching this line.
    startForeground(NOTIFICATION_ID, notificationBuilder.build());
  }
}

活动：

Intent intent = new Intent();
    intent.setClass(context, PlayerService.class);
    intent.setAction(action);
    intent.addFlags(Intent.FLAG_RECEIVER_FOREGROUND);
// one approach
    ContextCompat.startForegroundService(context, intent);
// Different approach
//    PendingIntent pendingIntent = PendingIntent
//        .getService(serviceContext, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);
//    try {
//      pendingIntent.send(serviceContext, 0, intent);
//    } catch (CanceledException e) {
//      Log.d(TAG, "sendIntent: failed");

我还补充说，清单中的Android前景服务权限：

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

我希望通知和服务能够持续。无法弄清楚为什么要称呼ondestroy。

Answer 1

Once the service has been created, the service must call its startForeground() method within five seconds.

针对Android 9(API级别28(或更高和使用前景服务的应用程序必须请求FOREGROUND_SERVICE许可

前景服务

编辑：我无法从您的代码中分辨出问题，但是根据我的经验，通知块应在override fun onCreate()