TODO:
- Make multitouch work better: https://android-developers.googleblog.com/2010/06/making-sense-of-multitouch.html
- Battery info
 - https://developer.android.com/training/monitoring-device-state/battery-monitoring
- Accelerometer
- Keyboard
 - No facility provided to get soft keyboard input events; presumably API is designed only for text entry. Make custom soft keyboard? For now no keyboard events at all
 - file:///Users/adiener/Library/Android/sdk/docs/guide/topics/ui/controls/text.html
 - https://stackoverflow.com/questions/5520085/android-show-softkeyboard-with-showsoftinput-is-not-working
- Switch to NativeActivity: file:///Users/adiener/Library/Android/sdk/docs/reference/android/app/NativeActivity.html