title: ImageView library that allows full screen pinch zoom?
body: <p>I have a FrameLayout that contains an ImageView which I'd like to be able to zoom in on. How can I enable a "pinch-to-zoom" in the ImageView? </p>
  
  <p>I'd like to be able to not have the zooming be restricted to the size of the ImageView but rather to the size of the containing FrameLayout as illustrated here (different app):</p>
  
  <p><a href="https://i.stack.imgur.com/p7v6t.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/p7v6t.png" alt="enter image description here"></a><a href="https://i.stack.imgur.com/gTfgY.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/gTfgY.jpg" alt="enter image description here"></a></p>