title: Double-tap to zoom and pinch to zoom on ImageView in android
body: <p>I was looking for iphone like tap and pinch zooming with android ImageView.  <a href="https://stackoverflow.com/users/854864/mike-ortiz">Mike Ortiz</a> have done some excellent work on TouchImageView to detect boundaries. His code can be found <a href="https://github.com/MikeOrtiz/TouchImageView" rel="noreferrer">here</a>.</p>
  
  <p>This code is missing only one thing, i.e., double-tap to zoom.  Can anyone help add this feature to Mike Ortiz code?</p>