1. uxpin.com
2.ppt: android UI Design Kit pptx 1.0 http://androiduiux.com/2013/04/15/android-ui-design-kit-pptx-1-0-free-download/
3. Android ICS/JB Photoshop GUI Design Kit 3.0
4.yang recommends: http://www.balsamiq.com/products/mockups
5.need chrome; http://android-ui-utils.googlecode.com/hg/asset-studio/dist/index.html
http://androidniceties.tumblr.com/
reference: http://uxdesign.smashingmagazine.com/
stock-photo
http://www.android-app-patterns.com/
http://androidniceties.tumblr.com/
http://www.android-app-patterns.com/category/content-creation
http://android-ui-utils.googlecode.com/hg/asset-studio/dist/index.html
http://www.axureformobile.com/articles/
http://mobile.smashingmagazine.com/2012/08/17/mobile-prototyping-axure-rp/
http://www.mobilexweb.com/blog/ui-guidelines-mobile-tablet-design
http://www.lovelyui.com/post/49943430979/feed-on-google-keep