I am new to android first of all so think of any newbie mistakes first

I am trying to add a fling function in my code.

public class MainGamePanel extends SurfaceView implements
    SurfaceHolder.Callback, OnGestureListener {

private MainThread thread;
private Droid droid;
private Droid droid2;
private static final String TAG = gameView.class.getSimpleName();
private GestureDetector gestureScanner;

public MainGamePanel(Context context){
        super(context);
        getHolder().addCallback(this);
        droid = new Droid(BitmapFactory.decodeResource(getResources(), R.drawable.playerbox2), 270, 300);
        droid2 = new Droid(BitmapFactory.decodeResource(getResources(), R.drawable.playerbox2), 50, 300);
        thread = new MainThread(getHolder(), this);
        setFocusable(true);
        gestureScanner = new GestureDetector(this);
}


    public boolean onTouchEvent(MotionEvent event){
    return gestureScanner.onTouchEvent(event);
}


@Override
protected void onDraw(Canvas canvas){
    canvas.drawColor(Color.BLACK);
    droid.draw(canvas);
    droid2.draw(canvas);
}

@Override
  public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float                         velocityY)
    {
         droid.setX(50);
        droid.setY(50);
        Log.d(TAG, "Coords: x=" + e1.getX() + ",y=" + e2.getY());
        return true;
    }

@Override
public boolean onDown(MotionEvent e) {
    droid2.setX((int)e.getX());
    droid2.setY((int)e.getY());


    Log.d(TAG, "Coords: x=" + e.getX() + ",y=" + e.getY());
    return false;
}

I got the gestureListener to work with: onDown, onLongPress, and onShowPress.

But i can't get any response with onFling, onSingleTapUp, and onScroll.

What mistake am I making? does it have to do with views?

I don't know what code would be useful to see.... so any suggestions would be much appreciated. Thank You!