Thanks to lukehutch on the IRC # android channel, I pointed to a blog post that describes how to fix this problem.
The reason this is even a problem is because Google did not include sources in the SDK. There is an error to fix this problem.
The workaround described in more detail in the blog post is to get sources with git (I specified 1.0 for the repo command, which I hope corresponds to the SDK 1.0-r2), collects all java source files and puts them in the correct directory structure in sources / directory (which goes right next to your android.jar from the SDK) and update the jar in Eclipse, after which you can browse the sources of the SDK class.
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Python script, java .