longlinht/android_source — reverse-engineered prompt

I want this turned into a usable Android OS study repo, not just a raw source dump. Please set up the Android Froyo source so it can actually be built and, if possible, run as an emulator image, and make the project easier to learn from while keeping the full source intact.

The main goal is to help someone read through Android internals and understand what is going on. Add clear documentation in plain English about the overall Android architecture and include focused notes on JNI, especially how Java methods connect to native code, how registration works, and where to look in the source for real examples like MediaScanner. If anything is outdated or tricky because this is old Android code, explain that and document the build steps, required environment, and any limitations so a beginner can follow along. Clean up anything obviously broken in the docs and organize the notes so they are easy to browse. You can look up current docs online if you need to.