robotrory

public class ImageAdapter extends BaseAdapter {
    private Context mContext;
    private File[] filesArray;

    public ImageAdapter(Context c, File dir) {
        mContext = c;
        //get the contents of the directory that you pass in through the constructor
        filesArray = new dir.listFiles();
    }

robotrory

import android.media.RemoteControlClient;
import android.os.Build;
import android.support.v4.media.session.MediaSessionCompat;
import android.support.v4.media.session.PlaybackStateCompat;

public class MediaSessionHelper {

    public static void applyState(MediaSessionCompat session, PlaybackStateCompat playbackState) {
        session.setPlaybackState(playbackState);