Does anyone know the required size of the icon.png files for the Android .APK files?

I tried changing the icon file in interpreter_android/res/ in the three "drawable" folders, but they did not show up.

I put a 128x128 in the hDPI, 96x96 in the mDPI and 64x64 in the lDPI.

EDIT: I had to modify the icon files in my project's /res/ folder... not the interpreter_android/ one i used as a template