MediaSessionCompatCallbackのonSkipToNext（）およびonSkipToPrevious（）がトリガーされない

Androidに通知プレーヤーを実装しようとしています。私はついていきますこの これを達成するためのガイド。ただし、私の要件として、バックグラウンド通知プレーヤーで「次へスキップ」と「前へスキップ」を実装する必要があります。

これまで、MediaSessionCompact.CallbackのonPlay（）およびonPause（）がトリガーされます。ただし、デバッグ中に、通知プレーヤーで次ボタンと前ボタンが押されたときにonSkipToNext（）およびonSkipToPrevious（）コールバックメソッドがトリガーされないことに気付きました。

入力に感謝します。以下に関連するコードを追加しました。

BackgroundAudioService

private void showPlayingNotification() {
    NotificationCompat.Builder builder = MediaStyleHelper.from(BackgroundAudioService.this, mMediaSessionCompat);
    if (builder == null) {
        return;
    }
    builder.addAction(new NotificationCompat.Action(android.R.drawable.ic_media_previous, "Previous", MediaButtonReceiver.buildMediaButtonPendingIntent(this, PlaybackStateCompat.ACTION_SKIP_TO_PREVIOUS)));
    builder.addAction(new NotificationCompat.Action(android.R.drawable.ic_media_pause, "Pause", MediaButtonReceiver.buildMediaButtonPendingIntent(this, PlaybackStateCompat.ACTION_PLAY_PAUSE)));
    builder.addAction(new NotificationCompat.Action(android.R.drawable.ic_media_next, "Next", MediaButtonReceiver.buildMediaButtonPendingIntent(this, PlaybackStateCompat.ACTION_SKIP_TO_NEXT)));
    builder.setStyle(new NotificationCompat.MediaStyle().setShowActionsInCompactView(0).setMediaSession(mMediaSessionCompat.getSessionToken()));
    builder.setSmallIcon(R.mipmap.ic_launcher);
    NotificationManagerCompat.from(BackgroundAudioService.this).notify(1, builder.build());
}
private void showPausedNotification() {
    NotificationCompat.Builder builder = MediaStyleHelper.from(this, mMediaSessionCompat);
    if (builder == null) {
        return;
    }
    builder.addAction(new NotificationCompat.Action(android.R.drawable.ic_media_previous, "Previous", MediaButtonReceiver.buildMediaButtonPendingIntent(this, PlaybackStateCompat.ACTION_SKIP_TO_PREVIOUS)));
    builder.addAction(new NotificationCompat.Action(android.R.drawable.ic_media_play, "Play", MediaButtonReceiver.buildMediaButtonPendingIntent(this, PlaybackStateCompat.ACTION_PLAY_PAUSE)));
    builder.addAction(new NotificationCompat.Action(android.R.drawable.ic_media_next, "Next", MediaButtonReceiver.buildMediaButtonPendingIntent(this, PlaybackStateCompat.ACTION_SKIP_TO_NEXT)));

    builder.setStyle(new NotificationCompat.MediaStyle().setShowActionsInCompactView(0).setMediaSession(mMediaSessionCompat.getSessionToken()));
    builder.setSmallIcon(R.mipmap.ic_launcher);
    NotificationManagerCompat.from(this).notify(1, builder.build());
}
private MediaSessionCompat.Callback mMediaSessionCallback = new MediaSessionCompat.Callback() {
    @Override
    public void onPlay() {
        super.onPlay();
        if (!successfullyRetrievedAudioFocus()) {
            return;
        }
        mMediaSessionCompat.setActive(true);
        setMediaPlaybackState(PlaybackStateCompat.STATE_PLAYING);
        Log.d("MyLog", "STATE_PLAYING");
        showPlayingNotification();
        mMediaPlayer.start();
    }
    @Override
    public void onPause() {
        super.onPause();
        if (mMediaPlayer.isPlaying()) {
            mMediaPlayer.pause();
            setMediaPlaybackState(PlaybackStateCompat.STATE_PAUSED);
            Log.d("MyLog", "STATE_PAUSED");
            showPausedNotification();
        }
    }
    @Override
    public void onSkipToNext() {
        super.onSkipToNext();
        setMediaPlaybackState(PlaybackStateCompat.STATE_SKIPPING_TO_NEXT);
        Log.d("MyLog", "STATE_SKIPPING_TO_NEXT");
    }
    @Override
    public void onSkipToPrevious() {
        super.onSkipToPrevious();
        setMediaPlaybackState(PlaybackStateCompat.STATE_SKIPPING_TO_PREVIOUS);
        Log.d("MyLog", "STATE_SKIPPING_TO_PREVIOUS");
    }
}

MediaStyleHelper

public static NotificationCompat.Builder from(
        Context context, MediaSessionCompat mediaSession) {
    MediaControllerCompat controller = mediaSession.getController();
    MediaMetadataCompat mediaMetadata = controller.getMetadata();
    MediaDescriptionCompat description = mediaMetadata.getDescription();
    NotificationCompat.Builder builder = new NotificationCompat.Builder(context);
    builder
            .setContentTitle(description.getTitle())
            .setContentText(description.getSubtitle())
            .setSubText(description.getDescription())
            .setLargeIcon(description.getIconBitmap())
            .setContentIntent(controller.getSessionActivity())
            .setDeleteIntent(
                    MediaButtonReceiver.buildMediaButtonPendingIntent(context, PlaybackStateCompat.ACTION_STOP))
            .setVisibility(NotificationCompat.VISIBILITY_PUBLIC);
    return builder;
}

主な活動のonCreate

   mMediaBrowserCompat = new MediaBrowserCompat(this, new ComponentName(this, BackgroundAudioService.class),
            mMediaBrowserCompatConnectionCallback, getIntent().getExtras());

主な活動

private MediaBrowserCompat.ConnectionCallback mMediaBrowserCompatConnectionCallback = new MediaBrowserCompat.ConnectionCallback() {
    @Override
    public void onConnected() {
        super.onConnected();
        try {
            mMediaControllerCompat = new MediaControllerCompat(MainActivity.this, mMediaBrowserCompat.getSessionToken());
            mMediaControllerCompat.registerCallback(mMediaControllerCompatCallback);
            setSupportMediaController(mMediaControllerCompat);
            getSupportMediaController().getTransportControls().playFromMediaId(String.valueOf(R.raw.warner_tautz_off_broadway), null);
        } catch( RemoteException e ) {
        }
    }
};
private MediaControllerCompat.Callback mMediaControllerCompatCallback = new MediaControllerCompat.Callback() {
    @Override
    public void onPlaybackStateChanged(PlaybackStateCompat state) {
        super.onPlaybackStateChanged(state);
        if( state == null ) {
            return;
        }
        switch( state.getState() ) {
            case PlaybackStateCompat.STATE_PLAYING: {
                mCurrentState = STATE_PLAYING;
                break;
            }
            case PlaybackStateCompat.STATE_PAUSED: {
                mCurrentState = STATE_PAUSED;
                break;
            }
            case PlaybackStateCompat.STATE_SKIPPING_TO_NEXT: {
                mCurrentState = STATE_SKIPPING_TO_NEXT;
                break;
            }
            case PlaybackStateCompat.STATE_SKIPPING_TO_PREVIOUS: {
                mCurrentState = STATE_SKIPPING_TO_PREVIOUS;
            }
        }
    }
};

更新

onMediaButtonEvent（）は、両方のボタンのアクション名「android.intent.action.MEDIA_BUTTON」を使用して、通知プレーヤーで次および前にトリガーされるようです。

   @Override
    public boolean onMediaButtonEvent(Intent mediaButtonEvent) {
        Log.d("MyLog", "executing onMediaButtonEvent: " + mediaButtonEvent.getAction());
        return super.onMediaButtonEvent(mediaButtonEvent);
    }