Libraries and utilities intended for use by module and framework code.
Since modules use the code in this project, it must adhere to mainline requirements, for example, by setting min_sdk_version in Soong modules.
This project uses a single source path for Java code. All Java code should go
in the java directory with subdirectories corresponding to the java package.
Android.bp files should go alongside the java source files, and should only
include java source for a single java package to encourage good code hygiene.
Tests for java code should go in the javatests directory and follow the same
structure.