Android :: Updated MultiTouchController.java For Simplifying The Development Of Multi-touch Applications On Android

If anybody is creating multi-touch apps for Android, you may have noticed the MotionEvent class is getting more and more complicated over time. Additionally you may have discovered your code has different quirky behavior on different devices (e.g. on Synaptics devices, touch-down / touch-up can cause sudden jumps in pointer position before the down/up event is received).

I have written a class to simplify the process of writing multi-touch applications for Android, and just updated it to Android 2.2 (and to handle 3+ touch points on true 2D multi-touch sensors, as present on the HTC Incredible and HTC EVO 4G), and moved the project to Google Code hosting:

http://code.google.com/p/android-multitouch-controller/

There are numerous advantages to using this controller over trying to reinvent the wheel yourself, including simplicity and automatic device- space / object-space coordinate conversion for pinch-zoom. This also correctly centers the zoom of a pinch operation on the center of the pinch rather than the center of the screen, and supports simultaneous pinch-and-drag for more realistic pinching.