Estoy usando Glide para todas las imágenes de carga del servidor, pero tengo problemas para intentar configurarlas de manera correcta para las notificaciones y RemoteControlClientCompat (eso es genial con las pantallas de bloqueo). Estoy desarrollando un reproductor de música, por lo que cada vez que se cambia una canción, la cubierta de las notificaciones debe cambiar. Tengo este código y funciona por primera vez (aunque la imagen se carga desde url o desde dibujable), pero no cuando se llama por segunda vez. ¡La imagen no cambia! CustomNotification se invoca cuando se cambia una canción. Y RegisterRemoteClient se invoca en la actividad de inicio.

Si esta no es la forma correcta de hacerlo, indique cómo.

public void CustomNotification() {
    Log.d(TAG, "Set custom notification");

    simpleRemoteView = new RemoteViews(getApplicationContext().getPackageName(), R.layout.notification_custom);
    expandedRemoteView = new RemoteViews(getApplicationContext().getPackageName(), R.layout.notification_big);

    mNotification = new NotificationCompat.Builder(getApplicationContext())
            .setSmallIcon(R.mipmap.ic_main_logo)
            .setTicker(mSongTitle + " - " + mSongAuthors)
            .setContentTitle(mSongTitle).build();

    setRemoteListeners(simpleRemoteView);
    setRemoteListeners(expandedRemoteView);

    try {
        //Check if playingSong has a cover url, if not set one from drawable
        if(!playingSong.has("cover")){
            mDummyAlbumArt = BitmapFactory.decodeResource(getResources(),R.drawable.image_song_album);
            mDummyAlbumArt2 = BitmapFactory.decodeResource(getResources(),R.drawable.image_song_album);
            mDummyAlbumArt3 = BitmapFactory.decodeResource(getResources(),R.drawable.image_song_album);
        }else {
            Glide.with(MainActivity.context)
                    .load(API.imgUrl(playingSong.getString("cover_img")))
                    .asBitmap()
                    .into(new SimpleTarget<Bitmap>(100, 100) {
                        @Override
                        public void onResourceReady(Bitmap bitmap, GlideAnimation anim) {
                            mDummyAlbumArt = bitmap;
                            mDummyAlbumArt2 = bitmap;
                            mDummyAlbumArt3 = bitmap;
                        }
                    });
        }
    } catch (JSONException e) {
        e.printStackTrace();
    }

    mNotification.contentView = simpleRemoteView;
    mNotification.contentView.setTextViewText(R.id.textSongName, mSongTitle);
    mNotification.contentView.setTextViewText(R.id.textAlbumName, mSongAuthors);
    mNotification.contentView.setImageViewBitmap(R.id.imageViewAlbumArt, mDummyAlbumArt);

    if (currentVersionSupportBigNotification) {
        mNotification.bigContentView = expandedRemoteView;
        mNotification.bigContentView.setTextViewText(R.id.textSongName, mSongTitle);
        mNotification.bigContentView.setTextViewText(R.id.textAlbumName, mSongAuthors);
        mNotification.bigContentView.setImageViewBitmap(R.id.imageViewAlbumArt, mDummyAlbumArt2);
    }

    if (mPlayer != null) {
        if (!mPlayer.isPlaying()) {
            mNotification.contentView.setImageViewResource(R.id.btnPlayPause, R.mipmap.play);
            if (currentVersionSupportBigNotification) {
                mNotification.bigContentView.setImageViewResource(R.id.btnPlayPause, R.mipmap.play);
            }
        } else {
            mNotification.contentView.setImageViewResource(R.id.btnPlayPause, R.mipmap.pause);
            if (currentVersionSupportBigNotification) {
                mNotification.bigContentView.setImageViewResource(R.id.btnPlayPause, R.mipmap.pause);
            }
        }
    }

    mNotification.flags |= Notification.FLAG_ONGOING_EVENT;
    if(currentVersionSupportBigNotification) { //As priority_max only suported on API 16, the same as big notification
        mNotification.priority = Notification.PRIORITY_MAX;
    }
    startForeground(NOTIFICATION_ID, mNotification);

    //update remote controls
    if (currentVersionSupportLockScreenControls) {
        remoteControlClientCompat.editMetadata(true)
                .putString(MediaMetadataRetriever.METADATA_KEY_TITLE, mSongTitle + " - " + mSongAuthors)
                .putBitmap(RemoteControlClientCompat.MetadataEditorCompat.METADATA_KEY_ARTWORK, mDummyAlbumArt3)
                .apply();
    }
}

public void setRemoteListeners(RemoteViews remoteViews){
    Log.d(TAG,"Setting remote listeners");
    PendingIntent piAppActivity = PendingIntent.getActivity(this, 0, new Intent(this, MainActivity.class),
            PendingIntent.FLAG_UPDATE_CURRENT);
    PendingIntent piPlayPause = PendingIntent.getService(this, 0, new Intent(MusicService.ACTION_TOGGLE_PLAYBACK), PendingIntent.FLAG_UPDATE_CURRENT);
    PendingIntent piNext = PendingIntent.getService(this, 0, new Intent(MusicService.ACTION_SKIP), PendingIntent.FLAG_UPDATE_CURRENT);
    PendingIntent piClose = PendingIntent.getService(this, 0, new Intent(MusicService.ACTION_STOP), PendingIntent.FLAG_UPDATE_CURRENT);
    PendingIntent piPrevious = PendingIntent.getService(this, 0, new Intent(MusicService.ACTION_PREVIOUS), PendingIntent.FLAG_UPDATE_CURRENT);

    remoteViews.setOnClickPendingIntent(R.id.linearLayoutNotification, piAppActivity);
    remoteViews.setOnClickPendingIntent(R.id.btnPlayPause, piPlayPause);
    remoteViews.setOnClickPendingIntent(R.id.btnNext, piNext);
    remoteViews.setOnClickPendingIntent(R.id.btnDelete, piClose);
    remoteViews.setOnClickPendingIntent(R.id.btnPrevious, piPrevious);
}

private void RegisterRemoteClient(){
    // Use the media button APIs (if available) to register ourselves for media button
    // events

    MediaButtonHelper.registerMediaButtonEventReceiverCompat(mAudioManager, mMediaButtonReceiverComponent);
    // Use the remote control APIs (if available) to set the playback state
    if (remoteControlClientCompat == null) {
        Intent intent = new Intent(Intent.ACTION_MEDIA_BUTTON);
        intent.setComponent(mMediaButtonReceiverComponent);
        remoteControlClientCompat = new RemoteControlClientCompat(PendingIntent.getBroadcast(this /*context*/,0 /*requestCode, ignored*/, intent /*intent*/, 0 /*flags*/));
        RemoteControlHelper.registerRemoteControlClient(mAudioManager,remoteControlClientCompat);
    }

    remoteControlClientCompat.setPlaybackState(RemoteControlClient.PLAYSTATE_PLAYING);
    remoteControlClientCompat.setTransportControlFlags(
            RemoteControlClient.FLAG_KEY_MEDIA_PAUSE |
                    RemoteControlClient.FLAG_KEY_MEDIA_PREVIOUS |
                    RemoteControlClient.FLAG_KEY_MEDIA_NEXT |
                    RemoteControlClient.FLAG_KEY_MEDIA_STOP);
}