Modifying and recompiling the Android SDK

Question

I know that some methods and some classes that are implemented in Android are not exported to the Android public SDK. I've been able to create an application that uses some of these functions by compiling my application placing it inside the Android tree. Would it be possible to export these functions to the Android SDK by recompiling it from the sources? How can this be done? Can I include custom classes and functions in the Android SDK as well (supposing of course I create a new SDK and a new firmware)? Thanks!

Answer 1

I didn't try it, but this should be the answer to my question: https://android.googlesource.com/platform/sdk/+/master/docs/howto_build_SDK.txt.