Android_Doc
Android SDK 官方下载页面
http://developer.android.com/sdk/index.html
Android Open Source
https://android.googlesource.com/
https://developers.google.com/android/nexus/images
android_Doc
http://stackoverflow.com/questions/2898053/android-offline-documentation-and-sample-codes/
目前最新版本：[https://dl-ssl.google.com/android/repository/docs-23_r02.zip]2
自己搭建的Android_Doc