I have done some work to help me understand multitouch features in Android. I built a simple demo with examples of pinch zooming and panning. Most of the examples involve using drawing operations on the canvas of a view. For more information about this, read the blog article at blahti.wordpress.com.
Source code for this demo app is attached below. Be sure to do a clean build in Eclipse after you import the project. The project was built with Android 4.4.2 (API level 19). It runs on API levels 10 and up.
(Note: The best place to download the zip is on this page. Click the download icon below to download. In some browsers (Chrome), if you click the zip file name first, you will find yourself on a page where the download links do not work. )