AppCompat
Official docs outline
5 sections- AppCompat release notes
AppCompat artifact versions and APIs.
- Support different densities and screens
Compat layouts, resources and screen support.
- Dark theme
AppCompatDelegate night modes and force dark.
- Themes and styles
Styles, themes and attributes in the View system.
- Toolbar and app bar
Toolbar and ActionBar setup with AppCompat.
Each section links to the official page. Titles and summaries by Extra Credit; the docs belong to their authors.