MainActivity.java

     private List<HwAudioStatusListener> mTempListeners = new CopyOnWriteArrayList<>(); //a global variable

     private void doListenersAndNotifications(final Context context) {
        new Handler(Looper.getMainLooper()).post(new Runnable() {
            @Override
            public void run() {
                for (HwAudioStatusListener listener : mTempListeners) {
                    try {
                        mHwAudioManager.addPlayerStatusListener(listener);
                    } catch (RemoteException e) {
                        Log.e("TAG", "TAG", e);
                    }
                }

                mHwAudioConfigManager.setSaveQueue(true);
                mHwAudioConfigManager.setNotificationFactory(new INotificationFactory() {
                    @Override
                    public Notification createNotification(NotificationConfig notificationConfig) {
                        if (Build.VERSION.SDK_INT > Build.VERSION_CODES.M) {
                            builder = new NotificationCompat.Builder(getApplication(), null);
                            RemoteViews remoteViews = new RemoteViews(getApplication().getPackageName(), R.layout.notification_player);
                            builder.setContent(remoteViews);
                            builder.setSmallIcon(R.drawable.icon_notifaction_music);
                            builder.setVisibility(NotificationCompat.VISIBILITY_PUBLIC);
                            builder.setCustomBigContentView(remoteViews);
                            NotificationUtils.addChannel(getApplication(), NotificationUtils.NOTIFY_CHANNEL_ID_PLAY, builder);
                            boolean isQueueEmpty = mHwAudioManager.getQueueManager().isQueueEmpty();
                            Bitmap bitmap;
                            bitmap = notificationConfig.getBitmap();
                            setBitmap(remoteViews, bitmap);
                            boolean isPlaying = mHwAudioManager.getPlayerManager().isPlaying() && !isQueueEmpty;
                            remoteViews.setImageViewResource(R.id.image_toggle, isPlaying ? R.drawable.ic_notification_stop : R.drawable.ic_notification_play);
                            HwAudioPlayItem playItem = mHwAudioManager.getQueueManager().getCurrentPlayItem();
                            remoteViews.setTextViewText(R.id.text_song, playItem.getAudioTitle());
                            remoteViews.setTextViewText(R.id.text_artist, playItem.getSinger());
                            remoteViews.setImageViewResource(R.id.image_last, R.drawable.ic_notification_before);
                            remoteViews.setImageViewResource(R.id.image_next, R.drawable.ic_notification_next);
                            remoteViews.setOnClickPendingIntent(R.id.image_last, notificationConfig.getPrePendingIntent());
                            remoteViews.setOnClickPendingIntent(R.id.image_toggle, notificationConfig.getPlayPendingIntent());
                            remoteViews.setOnClickPendingIntent(R.id.image_next, notificationConfig.getNextPendingIntent());
                            remoteViews.setOnClickPendingIntent(R.id.image_close, getCancelPendingIntent());
                            remoteViews.setOnClickPendingIntent(R.id.layout_content, getMainIntent());

                            return builder.build();
                        }
                        else{
                            NotificationCompat.Builder builder = new NotificationCompat.Builder(getApplication(), null);
                            RemoteViews remoteViews = new RemoteViews(getApplication().getPackageName(), R.layout.statusbar);
                            builder.setContent(remoteViews);
                            builder.setSmallIcon(R.drawable.icon_notifaction_music);
                            builder.setVisibility(NotificationCompat.VISIBILITY_PUBLIC);
                            builder.setCustomBigContentView(remoteViews);
                            NotificationUtils.addChannel(getApplication(), NotificationUtils.NOTIFY_CHANNEL_ID_PLAY, builder);
                            boolean isQueueEmpty = mHwAudioManager.getQueueManager().isQueueEmpty();
                            Bitmap bitmap;
                            bitmap = notificationConfig.getBitmap();
                            setBitmap(remoteViews, bitmap);
                            boolean isPlaying = mHwAudioManager.getPlayerManager().isPlaying() && !isQueueEmpty;
                            remoteViews.setImageViewResource(R.id.widget_id_control_play,
                                    isPlaying ? R.drawable.notify_btn_pause_selector : R.drawable.notify_btn_play_selector);
                            HwAudioPlayItem playItem = mHwAudioManager.getQueueManager().getCurrentPlayItem();
                            remoteViews.setTextViewText(R.id.trackname, playItem.getAudioTitle());
                            remoteViews.setTextViewText(R.id.artistalbum, playItem.getSinger());
                            remoteViews.setImageViewResource(R.id.widget_id_control_prev, R.drawable.notify_btn_close_selector);
                            remoteViews.setImageViewResource(R.id.widget_id_control_next, R.drawable.notify_btn_next_selector);
                            remoteViews.setOnClickPendingIntent(R.id.widget_id_control_prev, getCancelPendingIntent());
                            remoteViews.setOnClickPendingIntent(R.id.widget_id_control_play, notificationConfig.getPlayPendingIntent());
                            remoteViews.setOnClickPendingIntent(R.id.widget_id_control_next, notificationConfig.getNextPendingIntent());
                            remoteViews.setOnClickPendingIntent(R.id.statusbar_layout, getMainIntent());
                            return builder.build();
                        }
                    }
                });
            }
        });
    }

    private void setBitmap(RemoteViews remoteViews, Bitmap bitmap) {
        HwAudioPlayItem tmpItem = mHwAudioQueueManager.getCurrentPlayItem();
        Bitmap imageCoverOfMusic = getBitmapOfCover(tmpItem);
        if(imageCoverOfMusic != null){
            Log.i("TAG", "Notification bitmap not empty");
            remoteViews.setImageViewBitmap(R.id.image_cover, imageCoverOfMusic);
        }
        else{
            if (bitmap != null) {
                Log.i("TAG", "Notification bitmap not empty");
                remoteViews.setImageViewBitmap(R.id.image_cover, bitmap);
            } else {
                Log.w("TAG", "Notification bitmap is null");
                remoteViews.setImageViewResource(R.id.image_cover, R.drawable.icon_notifaction_default);
            }
        }

    }

    private Bitmap getAlbumImage(String path) {
        try{
            android.media.MediaMetadataRetriever mmr = new MediaMetadataRetriever();
            mmr.setDataSource(path);
            byte[] data = mmr.getEmbeddedPicture();
            if (data != null)
                return BitmapFactory.decodeByteArray(data, 0, data.length);
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
        return null;
    }

    public Bitmap getBitmapOfCover(HwAudioPlayItem currItem){
        if(currItem != null) {
            String currentSongPath = currItem.getFilePath();
            if (currentSongPath != null) {
                Bitmap tmpMap = getAlbumImage(currentSongPath);
                binding.albumPictureImageView.setImageBitmap(tmpMap);
                return tmpMap;
            }
        }
        return null;
    }

    private PendingIntent getCancelPendingIntent() {
        Log.i("TAG", "getCancelPendingIntent");
        Intent closeIntent = new Intent("com.menes.audiokittryoutapp.cancel_notification");
        closeIntent.setPackage(getApplication().getPackageName());
        return PendingIntent.getBroadcast(getApplication(), 2, closeIntent, PendingIntent.FLAG_UPDATE_CURRENT);
    }

    private PendingIntent getMainIntent() {
        Intent intent = new Intent("android.intent.action.MAIN");
        intent.addCategory("android.intent.category.LAUNCHER");
        intent.setClass(getApplication().getBaseContext(), MainActivity.class);
        intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED);
        return PendingIntent.getActivity(getApplication(), 0, intent, 0);
    }