Android development mirror site in China.

http://androidappdocs.appspot.com/index.html

http://android.yyable.com/offline.html

http://xiaogui.org/android/docs/sdk/android-3.0.html

http://1doc.info/docs/sdk/android-3.0.html

http://www.ideasandroid.com/android/sdk/docs/
http://developer.android.com.nyud.net/index.html

http://docs.androidmirror.com/

http://android.hidev.net/

http://static.meizu.com/m9sdk/index.html