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我有一个服务，我使用 ExoPlayer 在其中播放音乐。我正在为我的应用程序显示一个通知，因为它是一个前台服务，并且我不断更新 ExoPlayer 的 onPlayerStateChanged 回调方法中的通知：

@Override
public void onPlayerStateChanged(boolean playWhenReady, int playbackState) {
    ...
    showNotification(state, sample);
}

private void showNotification(PlaybackStateCompat state, Sample sample) {
    NotificationCompat.Builder builder = new NotificationCompat.Builder(this, "Id");

    int icon;
    String play_pause;
    if (state.getState() == PlaybackStateCompat.STATE_PLAYING) {
        icon = R.drawable.exo_controls_pause;
        play_pause = getString(R.string.pause);
    } else {
        icon = R.drawable.exo_controls_play;
        play_pause = getString(R.string.play);
    }

    NotificationCompat.Action playPauseAction = new NotificationCompat.Action(
            icon, play_pause,
            MediaButtonReceiver.buildMediaButtonPendingIntent(this,
                    PlaybackStateCompat.ACTION_PLAY_PAUSE));

    NotificationCompat.Action restartAction = new NotificationCompat
            .Action(R.drawable.exo_controls_previous, getString(R.string.restart),
            MediaButtonReceiver.buildMediaButtonPendingIntent
                    (this, PlaybackStateCompat.ACTION_SKIP_TO_PREVIOUS));

    NotificationCompat.Action nextAction = new NotificationCompat
            .Action(R.drawable.exo_controls_next, getString(R.string.next),
            MediaButtonReceiver.buildMediaButtonPendingIntent
                    (this, PlaybackStateCompat.ACTION_SKIP_TO_NEXT));

    PendingIntent contentPendingIntent = PendingIntent.getActivity
            (this, 0, new Intent(this, MainActivity.class), 0);

    Intent intent = new Intent(this, StopServiceBroadcastReceiver.class);
    PendingIntent pendingIntent = PendingIntent.getBroadcast(this.getApplicationContext(), 0, intent, 0);

    builder.setContentTitle(sample.getTitle())
            .setContentText(sample.getComposer())
            .setContentIntent(contentPendingIntent)
            .setDeleteIntent(pendingIntent)
            .setSmallIcon(R.drawable.ic_music_note)
            .setVisibility(NotificationCompat.VISIBILITY_PUBLIC)
            .addAction(restartAction)
            .addAction(playPauseAction)
            .addAction(nextAction).setStyle(new androidx.media.app.NotificationCompat.MediaStyle()
            .setMediaSession(mMediaSession.getSessionToken())
            .setShowActionsInCompactView(1, 2));

    mNotificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);

    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
        String channelId = "Id";
        NotificationChannel channel = new NotificationChannel(
                channelId,
                "Channel human readable title",
                NotificationManager.IMPORTANCE_LOW);
        mNotificationManager.createNotificationChannel(channel);
        builder.setChannelId(channelId);
    }

    Notification notificationCompat = builder.build();
    if (state.getState() == PlaybackStateCompat.STATE_PAUSED) {
        stopForeground(false);
        mNotificationManager.notify(NOTIFICATION_ID, notificationCompat);
    } else {
        startForeground(NOTIFICATION_ID, notificationCompat);
    }
}

PAUSE正如您在 state 为I时在方法末尾看到的那样stopForeground。这将在一分钟内销毁服务，因此通知将被取消，如以下线程中所述：https ://github.com/google/ExoPlayer/issues/5954

我是 SoundCloud 应用程序的用户。在他们的应用程序中，似乎当状态为 时PAUSE，他们也stopForeground因为通知是可关闭的。但是，如果我不手动关闭通知，通知将始终保留在状态栏中，并且似乎 Service 在他们的应用程序中没有被破坏。The scenario that I explained for SoundCloud is just a guess

你认为它是如何在他们的应用程序中实现的？

如果需要检查，可以在这里找到我的示例的完整源代码：https ://github.com/AliRezaeiii/ExoPlayerSample

/**
     * Release ExoPlayer.
     */
    private void releasePlayer() {
        mExoPlayer.removeListener(this);
        mExoPlayer.stop();
        mExoPlayer.release();
        mExoPlayer = null;
    }

    /**
     * Release the player when the service is destroyed.
     */
    @Override
    public void onDestroy() {
        Log.d(TAG, "onDestroy()");
        super.onDestroy();
        releasePlayer();
        mMediaSession.setActive(false);
    }
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