"go To Implementation" Of An Android Api Class Opens .class File, Not .java

I'm developing an app in Android Studio 0.4.0 (but this issue happened also on earlier versions), and when I try to access the implementation of an Android-specific class using the

Solution 1:

Attaching source jars or directories to included libraries isn't supported yet in Gradle-based Android Studio projects. The closest bug you can use to track progress is:

https://code.google.com/p/android/issues/detail?id=59220