Android, help rotating image on touch

Question

I am trying to rotate one of the transparent PNGs on this image. The number part is what I want to rotate. I am able to do this, but it is not what I am trying to achieve

Answer 1

I presume you want to rotate an image at the point where a user touches the screen? If so, extend the SimpleOnGestureListener like this example:

public class MyGestureDetector extends SimpleOnGestureListener
{  
     @Override
     public void onLongPress(MotionEvent event)
     {
         int X = (int)event.getX();          
         int Y = (int)event.getY();

         ...Rotate the image
     }
}

Once you've got the screen coordinates of the touch event, you could apply a Rotation Animation about the point - see here for more details: http://developer.android.com/guide/topics/graphics/2d-graphics.html