some android ui tools and tutorial

http://android-ui-utils.googlecode.com/hg/asset-studio/dist/icons-actionbar.html#source.space.trim=1&source.space.pad=0&name=sort&theme=light

http://blogfreakz.com/mobile-development/android-gui-icons-and-fonts/

http://developer.android.com/design/style/color.html

http://developer.android.com/guide/practices/ui_guidelines/index.html

Android - Creating custom button assets

Android Developers — Visual Design Screencast — Creating custom button assets - YouTube:

for creating android button