Launcher Icon:
-----------------------
ldpi: 36x36
mdpi: 48x48
hdpi: 72x72
xhdpi: 96x96
google code: 55x55
android market: 512x512

Status Bar Icon:
-----------------------
Android < 3.0
ldpi: 12x19
mdpi: 16x25
hdpi: 24x38

Android > 3.0
ldpi: 18x18
mdpi: 24x24
hdpi: 36x36
xhdpi: 48x48

ActionBar Icon:
-----------------------
ldpi: none
mdpi: 36 x 36 px
hdpi: 48 x 48 px
xhdpi: 64 x 64 px 

color: #737373