# Package Index

# Package Index

| The`android.arch`Architecture Components packages are no longer maintained. They have been superseded by the corresponding[androidx.\*](https://developer.android.com/jetpack/androidx/migrate)packages.

These are the API packages. See all[API classes](https://developer.android.com/reference/android/arch/classes).

|--------------------------------------------------------------------------------------------------------------------------------------------|----------------------------------------------------------------------------------------------------------|
| [android.arch.core.executor.testing](https://developer.android.com/reference/android/arch/core/executor/testing/package-summary)           |                                                                                                          |
| [android.arch.core.util](https://developer.android.com/reference/android/arch/core/util/package-summary)                                   |                                                                                                          |
| [android.arch.lifecycle](https://developer.android.com/reference/android/arch/lifecycle/package-summary)                                   |                                                                                                          |
| [android.arch.paging](https://developer.android.com/reference/android/arch/paging/package-summary)                                         |                                                                                                          |
| [android.arch.persistence.db](https://developer.android.com/reference/android/arch/persistence/db/package-summary)                         |                                                                                                          |
| [android.arch.persistence.db.framework](https://developer.android.com/reference/android/arch/persistence/db/framework/package-summary)     |                                                                                                          |
| [android.arch.persistence.room](https://developer.android.com/reference/android/arch/persistence/room/package-summary)                     | Room is a Database Object Mapping library that makes it easy to access database on Android applications. |
| [android.arch.persistence.room.migration](https://developer.android.com/reference/android/arch/persistence/room/migration/package-summary) |                                                                                                          |
| [android.arch.persistence.room.testing](https://developer.android.com/reference/android/arch/persistence/room/testing/package-summary)     |                                                                                                          |