- Android Support v4 (Development Framework)   The Android Support Library is not actually a single library, but rather a collection of libraries that can roughly be divided into two groups: compatibility and component libraries. For details, please see  Understanding the Android Support Library. 
- AndroidX Activity (Utility)   provides the base Activity subclass and the relevant hooks to build a composable structure on top. 
- AppCompat (Utility)   support newer Android features on older Android versions. 
- Constraint Layout Library (Utility)   library to reduce the number of nested views needed. 
- Coordinatorlayout (UI Component)   AndroidX library to position top-level application widgets, such as AppBarLayout and FloatingActionButton. 
- Androidx Core (Utility)   a static library that you can add to your Android application in order to use APIs that are either not available for older platform versions or utility APIs that aren't a part of the framework APIs. 
- Android Emoji2 Compat (UI Component)   core library to enable emoji compatibility in Kitkat and newer devices to avoid the empty emoji characters. 
- AndroidX Fragment (UI Component)   AndroidX library to encapsulate part of the user interface or behavior into reusable components. 
- Lifecycle (Utility)   perform actions in response to a change in the lifecycle status of another component, such as activities and fragments. 
- AndroidX Media (Utility)   share media contents and controls with other apps. 
- Preference (Utility)   a library to build interactive settings screens without needing to interact with device storage or manage the UI. 
- ProfileInstaller (Utility)   AndroidX library that enables libraries to prepopulate ahead of time compilation traces to be read by ART. 
- Recyclerview (Utility)   display large sets of data in your UI while minimizing memory usage. 
- Android Activity Saved State (Utility)   provides the base Activity subclass and the relevant hooks to build a composable structure on top. 
- Startup (Utility)   AndroidX library to implement a straightforward, performant way to initialize components at app startup. 
- Android Jetpack VersionedParcelable (Utility)   Provides a stable but relatively compact binary serialization format that can be passed across processes or persisted safely. 
- AndroidX Widget ViewPager2 (UI Component)   replaces AndroidX ViewPager, addressing most of its predecessor’s pain-points, including right-to-left layout support, vertical orientation, modifiable Fragment collections, etc. 
- Google Material Design (Utility)   library to help with material design guidelines.