I built my first Android app.
It is a Live Wallpaper designed for 2.2.
When I press and hold the screen, select Wallpapers and then select L
Wallpapers
L
inside the res/drawables directories you will see icon.png. you change this file to be the icon you want. the hdpi are for the devices with high density, like the nexus one, or evo. mdpi is for devices like the myTouch or G1