Android Source Code read online

List the following websites that can read the Android source code online:

1. http://omapzoom.org/

This website seems a little messy and supports git.

2. http://grepcode.com/project/repository.grepcode.com/java/ext/com.google.android/android/

Highly recommended, directory structure, code at a glance

3. A chrome plug-in, he can directly jump from the android online class document http://developer.android.com/reference/packages.html) to the implementation of this class source file!

Plug-in address: http://blog.blundell-apps.com/add-source-code-links-to-android-apis/