title: Detecting pinch in Android
body: <p>I would like to handle pinch events in my Android application to zoom in and out.</p>
  
  <p>I believe Android 2.0 has multi-touch functionality, and heard that Android 1.6 might or might not support it depending of the device.</p>
  
  <p>What's the best way to detect pinch events, while degrading gracefully for devices that don't support it? I'm targeting Android 1.5 upwards.</p>