Android: Why ActivityManagerNative is not resolvable

I am trying to trace through Android SDK code in my application. I get inside, there is a class called ActivitymanagerNative, that is not resolved. I can't access its code. However it exists inside my SDK paths

$ find ~/android-sdk-macosx/ -name

It is in the same package,
I have attached an image that shows it is not resolved.


Screen Shot 2013-04-23 at 8.23.36 PM.png

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