From Ittichai Chammavanijakul's Wiki
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Chapter 1: Android Overview
Chapter 2: The Stack
- Android stacks
- Linux kernel (display, camera, keypad, etc.)
- Native libraries (Android runtime (CoreLibs, Delvik VM), OpenGL, SSL, SQLite, Webkit, etc.)
- Application framework (Activity Manager, Content providers, Notification manager, etc.
- Applications (Home, Contacts, Phone, Browser, etc.)
- GNU libc, the default C library for Linux, is licensed under GPL license, which requires any changes we release to be pushed back to the open source community. On the other hand, some components are licensed under an Apache/MIT license, which does not require derivative works to be open sources.