Subpackages, i.e. folders, in this directory have their source of truth in the internal Google source code repository.

The code is manually copied because:

• Alternatives are automatically syncing Material Color Utilities from the internal Google source repository, or GitHub.
• Having Android's core automatically taking updates from code that changes regularly, and can easily affect design, is undesirable.

To update the code:

1. Copy Material Color Utilities (libmonet internally) from the internal Google source repository to this directory.
2. Replace package definitions. Use Find and Replace in directory, replace com.google.ux.material.libmonet with com.android.systemui.monet.
3. Remove @CanIgnoreReturnValue and @CheckReturnValue, both usage and imports. Currently only in Scheme.java. Chose removal because only Android /external libraries depend on the library with these annotations.
4. Copy tests for Material Color Utilities to frameworks/base/packages/SystemUI/tests/src/com/android/systemui/monet/
5. Remove HctRoundTripTest (~3 minutes to run) and QuantizerCelebiTest (depends on internal source repository code for handling images)
6. Reformat regular and test code to Android bracing/spacing style. In Android Studio, right click on the package, and choose Reformat Code.
7. Change tests to subclass SysuiTestCase and use an annotation such as @SmallTest / @MediumTest.