I have no idea what you think "simple Java API files."
The second link is not a git repo. This is the git repository family. Each row in this table represents one git repository. The first link is for instructions on how to use the Android tools to clone all of these repositories.
If you think the “simple Java API files” are for the java.* And javax.* , they are from libcore repo .
If you think that “simple Java API files” refer to the android.* Classes, they refer to the frameworks/base repo .
Other repositories may contribute to other parts of "simple Java API files" such as Apache HttpClient.
If all you are trying to do is push the code, I recommend Google Code Search . For example, I often refer to the source code of Android, and I did not download it.
[edit] And if all you want to do is develop applications for Android, you do not need any of this; just download sdk
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