The foundation of the Android platform is the Linux kernel. For example, the Android Runtime (ART) relies on the Linux kernel for underlying functionalities such as threading and low-level memory ...

Android Architecture Notes.md. ... The Android operating system is a multi-user Linux system in which each app is a different user. ... Java API Framework. This is often what allows you app to ...

Here, Android provides a substantial subset of the Java 5 Standard Edition packages, including Collections, I/O, and so forth. The next level up is the Application Framework layer.