Make it work in Android

[nunoh]

Iterate first in iOS and only then do the Android version. Might need to do some experimentation though in the meanwhile because of specific code stuff like swiping for example.

• first time compiling
• proper button sizing
• swipe right and left to change instrument
• at first launch doesn't go full fullscreen, since controls still appear at bottom. on resume doesn't happen though.
• shake to clear
• handle loading time at startup (do the same as in PORTOphone)