title: zooming image in viewflipper
body: <p>I have created a image slideshow using ViewFlipper.
  I have used imageFrame.setOnTouchListener(gestureListener); to listen user touch events like single tap,long tap</p>
  
  <p>But now i want to zoom in/out on current image in slideshow (ViewFlipper) ,on doubletap by user.I have searched internet for this but wasn't able to find a solution.Please help me out.</p>