# Class Index # Class Index | The`android.arch`Architecture Components packages are no longer maintained. They have been superseded by the corresponding[androidx.\*](https://developer.android.com/jetpack/androidx/migrate)packages.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 classes. See all[API packages](https://developer.android.com/reference/android/arch/packages). [A](https://developer.android.com/reference/android/arch/classes#letter_A)[C](https://developer.android.com/reference/android/arch/classes#letter_C)[D](https://developer.android.com/reference/android/arch/classes#letter_D)[E](https://developer.android.com/reference/android/arch/classes#letter_E)[F](https://developer.android.com/reference/android/arch/classes#letter_F)[I](https://developer.android.com/reference/android/arch/classes#letter_I)[L](https://developer.android.com/reference/android/arch/classes#letter_L)[M](https://developer.android.com/reference/android/arch/classes#letter_M)[O](https://developer.android.com/reference/android/arch/classes#letter_O)[P](https://developer.android.com/reference/android/arch/classes#letter_P)[Q](https://developer.android.com/reference/android/arch/classes#letter_Q)[R](https://developer.android.com/reference/android/arch/classes#letter_R)[S](https://developer.android.com/reference/android/arch/classes#letter_S)[T](https://developer.android.com/reference/android/arch/classes#letter_T)[U](https://developer.android.com/reference/android/arch/classes#letter_U)[V](https://developer.android.com/reference/android/arch/classes#letter_V) ## A |---------------------------------------------------------------------------------------------------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | [AndroidViewModel](https://developer.android.com/reference/android/arch/lifecycle/AndroidViewModel) | Application context aware[ViewModel](https://developer.android.com/reference/android/arch/lifecycle/ViewModel). | | [AsyncPagedListDiffer](https://developer.android.com/reference/android/arch/paging/AsyncPagedListDiffer)\ | Helper object for mapping a[PagedList](https://developer.android.com/reference/android/arch/paging/PagedList)into a[RecyclerView.Adapter](https://developer.android.com/reference/android/support/v7/widget/RecyclerView.Adapter). | ## C |--------------------------------------------------------------------------------------------------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------| | [ColumnInfo](https://developer.android.com/reference/android/arch/persistence/room/ColumnInfo) | Allows specific customization about the column associated with this field. | | [ColumnInfo.Collate](https://developer.android.com/reference/android/arch/persistence/room/ColumnInfo.Collate) | | | [ColumnInfo.SQLiteTypeAffinity](https://developer.android.com/reference/android/arch/persistence/room/ColumnInfo.SQLiteTypeAffinity) | The SQLite column type constants that can be used in[typeAffinity()](https://developer.android.com/reference/android/arch/persistence/room/ColumnInfo#typeAffinity()) | | [CountingTaskExecutorRule](https://developer.android.com/reference/android/arch/core/executor/testing/CountingTaskExecutorRule) | A JUnit Test Rule that swaps the background executor used by the Architecture Components with a different one which counts the tasks as they are start and finish. | ## D |------------------------------------------------------------------------------------------------------------------------------|--------------------------------------------------------------------------------------------------------------------------------------------------| | [Dao](https://developer.android.com/reference/android/arch/persistence/room/Dao) | Marks the class as a Data Access Object. | | [Database](https://developer.android.com/reference/android/arch/persistence/room/Database) | Marks a class as a RoomDatabase. | | [DatabaseConfiguration](https://developer.android.com/reference/android/arch/persistence/room/DatabaseConfiguration) | Configuration class for a[RoomDatabase](https://developer.android.com/reference/android/arch/persistence/room/RoomDatabase). | | [DataSource](https://developer.android.com/reference/android/arch/paging/DataSource)\ | Base class for loading pages of snapshot data into a[PagedList](https://developer.android.com/reference/android/arch/paging/PagedList). | | [DataSource.Factory](https://developer.android.com/reference/android/arch/paging/DataSource.Factory)\ | Factory for DataSources. | | [DataSource.InvalidatedCallback](https://developer.android.com/reference/android/arch/paging/DataSource.InvalidatedCallback) | Invalidation callback for DataSource. | | [DefaultLifecycleObserver](https://developer.android.com/reference/android/arch/lifecycle/DefaultLifecycleObserver) | Callback interface for listening to[LifecycleOwner](https://developer.android.com/reference/android/arch/lifecycle/LifecycleOwner)state changes. | | [Delete](https://developer.android.com/reference/android/arch/persistence/room/Delete) | Marks a method in a[Dao](https://developer.android.com/reference/android/arch/persistence/room/Dao)annotated class as a delete method. | ## E |--------------------------------------------------------------------------------------------------------------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | [Embedded](https://developer.android.com/reference/android/arch/persistence/room/Embedded) | Can be used as an annotation on a field of an[Entity](https://developer.android.com/reference/android/arch/persistence/room/Entity)or`Pojo`to signal that nested fields (i.e. | | [EmptyResultSetException](https://developer.android.com/reference/android/arch/persistence/room/EmptyResultSetException) | Thrown by Room when the query needs to return a result (e.g. | | [Entity](https://developer.android.com/reference/android/arch/persistence/room/Entity) | Marks a class as an entity. | ## F |----------------------------------------------------------------------------------------------------------------------------------------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | [ForeignKey](https://developer.android.com/reference/android/arch/persistence/room/ForeignKey) | Declares a foreign key on another[Entity](https://developer.android.com/reference/android/arch/persistence/room/Entity). | | [ForeignKey.Action](https://developer.android.com/reference/android/arch/persistence/room/ForeignKey.Action) | Constants definition for values that can be used in[onDelete()](https://developer.android.com/reference/android/arch/persistence/room/ForeignKey#onDelete())and[onUpdate()](https://developer.android.com/reference/android/arch/persistence/room/ForeignKey#onUpdate()). | | [FrameworkSQLiteOpenHelperFactory](https://developer.android.com/reference/android/arch/persistence/db/framework/FrameworkSQLiteOpenHelperFactory) | Implements[SupportSQLiteOpenHelper.Factory](https://developer.android.com/reference/android/arch/persistence/db/SupportSQLiteOpenHelper.Factory)using the SQLite implementation in the framework. | | [Function](https://developer.android.com/reference/android/arch/core/util/Function)\ | Represents a function. | ## I |---------------------------------------------------------------------------------------------------------------------------------------------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | [Ignore](https://developer.android.com/reference/android/arch/persistence/room/Ignore) | Ignores the marked element from Room's processing logic. | | [Index](https://developer.android.com/reference/android/arch/persistence/room) | Declares an index on an Entity. | | [Insert](https://developer.android.com/reference/android/arch/persistence/room/Insert) | Marks a method in a[Dao](https://developer.android.com/reference/android/arch/persistence/room/Dao)annotated class as an insert method. | | [InstantTaskExecutorRule](https://developer.android.com/reference/android/arch/core/executor/testing/InstantTaskExecutorRule) | A JUnit Test Rule that swaps the background executor used by the Architecture Components with a different one which executes each task synchronously. | | [InvalidationTracker](https://developer.android.com/reference/android/arch/persistence/room/InvalidationTracker) | InvalidationTracker keeps a list of tables modified by queries and notifies its callbacks about these tables. | | [InvalidationTracker.Observer](https://developer.android.com/reference/android/arch/persistence/room/InvalidationTracker.Observer) | An observer that can listen for changes in the database. | | [ItemKeyedDataSource](https://developer.android.com/reference/android/arch/paging/ItemKeyedDataSource)\ | Incremental data loader for paging keyed content, where loaded content uses previously loaded items as input to future loads. | | [ItemKeyedDataSource.LoadCallback](https://developer.android.com/reference/android/arch/paging/ItemKeyedDataSource.LoadCallback)\ | Callback for ItemKeyedDataSource[loadBefore(LoadParams, LoadCallback)](https://developer.android.com/reference/android/arch/paging/ItemKeyedDataSource#loadBefore(android.arch.paging.ItemKeyedDataSource.LoadParams, android.arch.paging.ItemKeyedDataSource.LoadCallback))and[loadAfter(LoadParams, LoadCallback)](https://developer.android.com/reference/android/arch/paging/ItemKeyedDataSource#loadAfter(android.arch.paging.ItemKeyedDataSource.LoadParams, android.arch.paging.ItemKeyedDataSource.LoadCallback))to return data. | | [ItemKeyedDataSource.LoadInitialCallback](https://developer.android.com/reference/android/arch/paging/ItemKeyedDataSource.LoadInitialCallback)\ | Callback for[loadInitial(LoadInitialParams, LoadInitialCallback)](https://developer.android.com/reference/android/arch/paging/ItemKeyedDataSource#loadInitial(android.arch.paging.ItemKeyedDataSource.LoadInitialParams, android.arch.paging.ItemKeyedDataSource.LoadInitialCallback))to return data and, optionally, position/count information. | | [ItemKeyedDataSource.LoadInitialParams](https://developer.android.com/reference/android/arch/paging/ItemKeyedDataSource.LoadInitialParams)\ | Holder object for inputs to[loadInitial(LoadInitialParams, LoadInitialCallback)](https://developer.android.com/reference/android/arch/paging/ItemKeyedDataSource#loadInitial(android.arch.paging.ItemKeyedDataSource.LoadInitialParams, android.arch.paging.ItemKeyedDataSource.LoadInitialCallback)). | | [ItemKeyedDataSource.LoadParams](https://developer.android.com/reference/android/arch/paging/ItemKeyedDataSource.LoadParams)\ | Holder object for inputs to[loadBefore(LoadParams, LoadCallback)](https://developer.android.com/reference/android/arch/paging/ItemKeyedDataSource#loadBefore(android.arch.paging.ItemKeyedDataSource.LoadParams, android.arch.paging.ItemKeyedDataSource.LoadCallback))and[loadAfter(LoadParams, LoadCallback)](https://developer.android.com/reference/android/arch/paging/ItemKeyedDataSource#loadAfter(android.arch.paging.ItemKeyedDataSource.LoadParams, android.arch.paging.ItemKeyedDataSource.LoadCallback)). | ## L |------------------------------------------------------------------------------------------------------------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | [Lifecycle](https://developer.android.com/reference/android/arch/lifecycle/Lifecycle) | Defines an object that has an Android Lifecycle. | | [Lifecycle.Event](https://developer.android.com/reference/android/arch/lifecycle/Lifecycle.Event) | | | [Lifecycle.State](https://developer.android.com/reference/android/arch/lifecycle/Lifecycle.State) | Lifecycle states. | | [LifecycleObserver](https://developer.android.com/reference/android/arch/lifecycle/LifecycleObserver) | Marks a class as a LifecycleObserver. | | [LifecycleOwner](https://developer.android.com/reference/android/arch/lifecycle/LifecycleOwner) | A class that has an Android lifecycle. | | [LifecycleRegistry](https://developer.android.com/reference/android/arch/lifecycle/LifecycleRegistry) | An implementation of[Lifecycle](https://developer.android.com/reference/android/arch/lifecycle/Lifecycle)that can handle multiple observers. | | [LifecycleRegistryOwner](https://developer.android.com/reference/android/arch/lifecycle/LifecycleRegistryOwner) | *This interface was deprecated in API level 1.1.0. Use`android.support.v7.app.AppCompatActivity`which extends[LifecycleOwner](https://developer.android.com/reference/android/arch/lifecycle/LifecycleOwner), so there are no use cases for this class.* | | [LifecycleService](https://developer.android.com/reference/android/arch/lifecycle/LifecycleService) | A Service that is also a[LifecycleOwner](https://developer.android.com/reference/android/arch/lifecycle/LifecycleOwner). | | [LiveData](https://developer.android.com/reference/android/arch/lifecycle/LiveData)\ | LiveData is a data holder class that can be observed within a given lifecycle. | | [LiveDataReactiveStreams](https://developer.android.com/reference/android/arch/lifecycle/LiveDataReactiveStreams) | Adapts[LiveData](https://developer.android.com/reference/android/arch/lifecycle/LiveData)input and output to the ReactiveStreams spec. | | [LivePagedListBuilder](https://developer.android.com/reference/android/arch/paging/LivePagedListBuilder)\ | Builder for`LiveData`, given a[DataSource.Factory](https://developer.android.com/reference/android/arch/paging/DataSource.Factory)and a[PagedList.Config](https://developer.android.com/reference/android/arch/paging/PagedList.Config). | ## M |--------------------------------------------------------------------------------------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | [MediatorLiveData](https://developer.android.com/reference/android/arch/lifecycle/MediatorLiveData)\ | [LiveData](https://developer.android.com/reference/android/arch/lifecycle/LiveData)subclass which may observe other`LiveData`objects and react on`OnChanged`events from them. | | [Migration](https://developer.android.com/reference/android/arch/persistence/room/migration/Migration) | Base class for a database migration. | | [MigrationTestHelper](https://developer.android.com/reference/android/arch/persistence/room/testing/MigrationTestHelper) | A class that can be used in your Instrumentation tests that can create the database in an older schema. | | [MutableLiveData](https://developer.android.com/reference/android/arch/lifecycle/MutableLiveData)\ | [LiveData](https://developer.android.com/reference/android/arch/lifecycle/LiveData)which publicly exposes[setValue(T)](https://developer.android.com/reference/android/arch/lifecycle/MutableLiveData#setValue(T))and[postValue(T)](https://developer.android.com/reference/android/arch/lifecycle/MutableLiveData#postValue(T))method. | ## O |----------------------------------------------------------------------------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------| | [Observer](https://developer.android.com/reference/android/arch/lifecycle/Observer)\ | A simple callback that can receive from[LiveData](https://developer.android.com/reference/android/arch/lifecycle/LiveData). | | [OnConflictStrategy](https://developer.android.com/reference/android/arch/persistence/room/OnConflictStrategy) | Set of conflict handling strategies for various[Dao](https://developer.android.com/reference/android/arch/persistence/room/Dao)methods. | | [OnLifecycleEvent](https://developer.android.com/reference/android/arch/lifecycle/OnLifecycleEvent) | | ## P |--------------------------------------------------------------------------------------------------------------------------------------------------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | [PagedList](https://developer.android.com/reference/android/arch/paging/PagedList)\ | Lazy loading list that pages in immutable content from a[DataSource](https://developer.android.com/reference/android/arch/paging/DataSource). | | [PagedList.BoundaryCallback](https://developer.android.com/reference/android/arch/paging/PagedList.BoundaryCallback)\ | Signals when a PagedList has reached the end of available data. | | [PagedList.Builder](https://developer.android.com/reference/android/arch/paging/PagedList.Builder)\ | Builder class for PagedList. | | [PagedList.Callback](https://developer.android.com/reference/android/arch/paging/PagedList.Callback) | Callback signaling when content is loaded into the list. | | [PagedList.Config](https://developer.android.com/reference/android/arch/paging/PagedList.Config) | Configures how a PagedList loads content from its DataSource. | | [PagedList.Config.Builder](https://developer.android.com/reference/android/arch/paging/PagedList.Config.Builder) | Builder class for[PagedList.Config](https://developer.android.com/reference/android/arch/paging/PagedList.Config). | | [PagedListAdapter](https://developer.android.com/reference/android/arch/paging/PagedListAdapter)\ | [RecyclerView.Adapter](https://developer.android.com/reference/android/support/v7/widget/RecyclerView.Adapter)base class for presenting paged data from[PagedList](https://developer.android.com/reference/android/arch/paging/PagedList)s in a[RecyclerView](https://developer.android.com/reference/android/support/v7/widget/RecyclerView). | | [PageKeyedDataSource](https://developer.android.com/reference/android/arch/paging/PageKeyedDataSource)\ | Incremental data loader for page-keyed content, where requests return keys for next/previous pages. | | [PageKeyedDataSource.LoadCallback](https://developer.android.com/reference/android/arch/paging/PageKeyedDataSource.LoadCallback)\ | Callback for PageKeyedDataSource[loadBefore(LoadParams, LoadCallback)](https://developer.android.com/reference/android/arch/paging/PageKeyedDataSource#loadBefore(android.arch.paging.PageKeyedDataSource.LoadParams, android.arch.paging.PageKeyedDataSource.LoadCallback))and[loadAfter(LoadParams, LoadCallback)](https://developer.android.com/reference/android/arch/paging/PageKeyedDataSource#loadAfter(android.arch.paging.PageKeyedDataSource.LoadParams, android.arch.paging.PageKeyedDataSource.LoadCallback))to return data. | | [PageKeyedDataSource.LoadInitialCallback](https://developer.android.com/reference/android/arch/paging/PageKeyedDataSource.LoadInitialCallback)\ | Callback for[loadInitial(LoadInitialParams, LoadInitialCallback)](https://developer.android.com/reference/android/arch/paging/PageKeyedDataSource#loadInitial(android.arch.paging.PageKeyedDataSource.LoadInitialParams, android.arch.paging.PageKeyedDataSource.LoadInitialCallback))to return data and, optionally, position/count information. | | [PageKeyedDataSource.LoadInitialParams](https://developer.android.com/reference/android/arch/paging/PageKeyedDataSource.LoadInitialParams)\ | Holder object for inputs to[loadInitial(LoadInitialParams, LoadInitialCallback)](https://developer.android.com/reference/android/arch/paging/PageKeyedDataSource#loadInitial(android.arch.paging.PageKeyedDataSource.LoadInitialParams, android.arch.paging.PageKeyedDataSource.LoadInitialCallback)). | | [PageKeyedDataSource.LoadParams](https://developer.android.com/reference/android/arch/paging/PageKeyedDataSource.LoadParams)\ | Holder object for inputs to[loadBefore(LoadParams, LoadCallback)](https://developer.android.com/reference/android/arch/paging/PageKeyedDataSource#loadBefore(android.arch.paging.PageKeyedDataSource.LoadParams, android.arch.paging.PageKeyedDataSource.LoadCallback))and[loadAfter(LoadParams, LoadCallback)](https://developer.android.com/reference/android/arch/paging/PageKeyedDataSource#loadAfter(android.arch.paging.PageKeyedDataSource.LoadParams, android.arch.paging.PageKeyedDataSource.LoadCallback)). | | [PositionalDataSource](https://developer.android.com/reference/android/arch/paging/PositionalDataSource)\ | Position-based data loader for a fixed-size, countable data set, supporting fixed-size loads at arbitrary page positions. | | [PositionalDataSource.LoadInitialCallback](https://developer.android.com/reference/android/arch/paging/PositionalDataSource.LoadInitialCallback)\ | Callback for[loadInitial(LoadInitialParams, LoadInitialCallback)](https://developer.android.com/reference/android/arch/paging/PositionalDataSource#loadInitial(android.arch.paging.PositionalDataSource.LoadInitialParams, android.arch.paging.PositionalDataSource.LoadInitialCallback))to return data, position, and count. | | [PositionalDataSource.LoadInitialParams](https://developer.android.com/reference/android/arch/paging/PositionalDataSource.LoadInitialParams) | Holder object for inputs to[loadInitial(LoadInitialParams, LoadInitialCallback)](https://developer.android.com/reference/android/arch/paging/PositionalDataSource#loadInitial(android.arch.paging.PositionalDataSource.LoadInitialParams, android.arch.paging.PositionalDataSource.LoadInitialCallback)). | | [PositionalDataSource.LoadRangeCallback](https://developer.android.com/reference/android/arch/paging/PositionalDataSource.LoadRangeCallback)\ | Callback for PositionalDataSource[loadRange(LoadRangeParams, LoadRangeCallback)](https://developer.android.com/reference/android/arch/paging/PositionalDataSource#loadRange(android.arch.paging.PositionalDataSource.LoadRangeParams, android.arch.paging.PositionalDataSource.LoadRangeCallback))to return data. | | [PositionalDataSource.LoadRangeParams](https://developer.android.com/reference/android/arch/paging/PositionalDataSource.LoadRangeParams) | Holder object for inputs to[loadRange(LoadRangeParams, LoadRangeCallback)](https://developer.android.com/reference/android/arch/paging/PositionalDataSource#loadRange(android.arch.paging.PositionalDataSource.LoadRangeParams, android.arch.paging.PositionalDataSource.LoadRangeCallback)). | | [PrimaryKey](https://developer.android.com/reference/android/arch/persistence/room/PrimaryKey) | Marks a field in an[Entity](https://developer.android.com/reference/android/arch/persistence/room/Entity)as the primary key. | | [ProcessLifecycleOwner](https://developer.android.com/reference/android/arch/lifecycle/ProcessLifecycleOwner) | Class that provides lifecycle for the whole application process. | ## Q |--------------------------------------------------------------------------------------|---------------------------------------------------------------------------------------------------------------------------------------| | [Query](https://developer.android.com/reference/android/arch/persistence/room/Query) | Marks a method in a[Dao](https://developer.android.com/reference/android/arch/persistence/room/Dao)annotated class as a query method. | ## R |-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | [RawQuery](https://developer.android.com/reference/android/arch/persistence/room/RawQuery) | Marks a method in a[Dao](https://developer.android.com/reference/android/arch/persistence/room/Dao)annotated class as a raw query method where you can pass the query as a[SupportSQLiteQuery](https://developer.android.com/reference/android/arch/persistence/db/SupportSQLiteQuery). | | [Relation](https://developer.android.com/reference/android/arch/persistence/room/Relation) | A convenience annotation which can be used in a Pojo to automatically fetch relation entities. | | [Room](https://developer.android.com/reference/android/arch/persistence/room/Room) | Utility class for Room. | | [RoomDatabase](https://developer.android.com/reference/android/arch/persistence/room/RoomDatabase) | Base class for all Room databases. | | [RoomDatabase.Builder](https://developer.android.com/reference/android/arch/persistence/room/RoomDatabase.Builder)\ | Builder for RoomDatabase. | | [RoomDatabase.Callback](https://developer.android.com/reference/android/arch/persistence/room/RoomDatabase.Callback) | Callback for[RoomDatabase](https://developer.android.com/reference/android/arch/persistence/room/RoomDatabase). | | [RoomDatabase.JournalMode](https://developer.android.com/reference/android/arch/persistence/room/RoomDatabase.JournalMode) | Journal modes for SQLite database. | | [RoomDatabase.MigrationContainer](https://developer.android.com/reference/android/arch/persistence/room/RoomDatabase.MigrationContainer) | A container to hold migrations. | | [RoomWarnings](https://developer.android.com/reference/android/arch/persistence/room/RoomWarnings) | The list of warnings that are produced by Room. | | [RxPagedListBuilder](https://developer.android.com/reference/android/arch/paging/RxPagedListBuilder)\ | Builder for`Observable`or`Flowable`, given a[DataSource.Factory](https://developer.android.com/reference/android/arch/paging/DataSource.Factory)and a[PagedList.Config](https://developer.android.com/reference/android/arch/paging/PagedList.Config). | | [RxRoom](https://developer.android.com/reference/android/arch/persistence/room/RxRoom) | Helper class to add RxJava2 support to Room. | ## S |--------------------------------------------------------------------------------------------------------------------------------------------------------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | [ServiceLifecycleDispatcher](https://developer.android.com/reference/android/arch/lifecycle/ServiceLifecycleDispatcher) | Helper class to dispatch lifecycle events for a service. | | [SimpleSQLiteQuery](https://developer.android.com/reference/android/arch/persistence/db/SimpleSQLiteQuery) | A basic implementation of[SupportSQLiteQuery](https://developer.android.com/reference/android/arch/persistence/db/SupportSQLiteQuery)which receives a query and its args and binds args based on the passed in Object type. | | [SkipQueryVerification](https://developer.android.com/reference/android/arch/persistence/room/SkipQueryVerification) | Skips database verification for the annotated element. | | [SupportSQLiteDatabase](https://developer.android.com/reference/android/arch/persistence/db/SupportSQLiteDatabase) | A database abstraction which removes the framework dependency and allows swapping underlying sql versions. | | [SupportSQLiteOpenHelper](https://developer.android.com/reference/android/arch/persistence/db/SupportSQLiteOpenHelper) | An interface to map the behavior of[SQLiteOpenHelper](https://developer.android.com/reference/android/database/sqlite/SQLiteOpenHelper.html). | | [SupportSQLiteOpenHelper.Callback](https://developer.android.com/reference/android/arch/persistence/db/SupportSQLiteOpenHelper.Callback) | Handles various lifecycle events for the SQLite connection, similar to[SQLiteOpenHelper](https://developer.android.com/reference/android/database/sqlite/SQLiteOpenHelper.html). | | [SupportSQLiteOpenHelper.Configuration](https://developer.android.com/reference/android/arch/persistence/db/SupportSQLiteOpenHelper.Configuration) | The configuration to create an SQLite open helper object using[SupportSQLiteOpenHelper.Factory](https://developer.android.com/reference/android/arch/persistence/db/SupportSQLiteOpenHelper.Factory). | | [SupportSQLiteOpenHelper.Configuration.Builder](https://developer.android.com/reference/android/arch/persistence/db/SupportSQLiteOpenHelper.Configuration.Builder) | Builder class for[SupportSQLiteOpenHelper.Configuration](https://developer.android.com/reference/android/arch/persistence/db/SupportSQLiteOpenHelper.Configuration). | | [SupportSQLiteOpenHelper.Factory](https://developer.android.com/reference/android/arch/persistence/db/SupportSQLiteOpenHelper.Factory) | Factory class to create instances of[SupportSQLiteOpenHelper](https://developer.android.com/reference/android/arch/persistence/db/SupportSQLiteOpenHelper)using[SupportSQLiteOpenHelper.Configuration](https://developer.android.com/reference/android/arch/persistence/db/SupportSQLiteOpenHelper.Configuration). | | [SupportSQLiteProgram](https://developer.android.com/reference/android/arch/persistence/db/SupportSQLiteProgram) | An interface to map the behavior of[SQLiteProgram](https://developer.android.com/reference/android/database/sqlite/SQLiteProgram.html). | | [SupportSQLiteQuery](https://developer.android.com/reference/android/arch/persistence/db/SupportSQLiteQuery) | A query with typed bindings. | | [SupportSQLiteQueryBuilder](https://developer.android.com/reference/android/arch/persistence/db/SupportSQLiteQueryBuilder) | A simple query builder to create SQL SELECT queries. | | [SupportSQLiteStatement](https://developer.android.com/reference/android/arch/persistence/db/SupportSQLiteStatement) | An interface to map the behavior of[SQLiteStatement](https://developer.android.com/reference/android/database/sqlite/SQLiteStatement.html). | ## T |--------------------------------------------------------------------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------| | [Transaction](https://developer.android.com/reference/android/arch/persistence/room/Transaction) | Marks a method in a[Dao](https://developer.android.com/reference/android/arch/persistence/room/Dao)class as a transaction method. | | [Transformations](https://developer.android.com/reference/android/arch/lifecycle/Transformations) | Transformations for a[LiveData](https://developer.android.com/reference/android/arch/lifecycle/LiveData)class. | | [TypeConverter](https://developer.android.com/reference/android/arch/persistence/room/TypeConverter) | Marks a method as a type converter. | | [TypeConverters](https://developer.android.com/reference/android/arch/persistence/room/TypeConverters) | Specifies additional type converters that Room can use. | ## U |----------------------------------------------------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------| | [Update](https://developer.android.com/reference/android/arch/persistence/room/Update) | Marks a method in a[Dao](https://developer.android.com/reference/android/arch/persistence/room/Dao)annotated class as an update method. | ## V |-------------------------------------------------------------------------------------------------------------------------------------------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | [ViewModel](https://developer.android.com/reference/android/arch/lifecycle/ViewModel) | ViewModel is a class that is responsible for preparing and managing the data for an[Activity](https://developer.android.com/reference/android/app/Activity.html)or a[Fragment](https://developer.android.com/reference/android/support/v4/app/Fragment). | | [ViewModelProvider](https://developer.android.com/reference/android/arch/lifecycle/ViewModelProvider) | An utility class that provides`ViewModels`for a scope. | | [ViewModelProvider.AndroidViewModelFactory](https://developer.android.com/reference/android/arch/lifecycle/ViewModelProvider.AndroidViewModelFactory) | [ViewModelProvider.Factory](https://developer.android.com/reference/android/arch/lifecycle/ViewModelProvider.Factory)which may create[AndroidViewModel](https://developer.android.com/reference/android/arch/lifecycle/AndroidViewModel)and[ViewModel](https://developer.android.com/reference/android/arch/lifecycle/ViewModel), which have an empty constructor. | | [ViewModelProvider.Factory](https://developer.android.com/reference/android/arch/lifecycle/ViewModelProvider.Factory) | Implementations of`Factory`interface are responsible to instantiate ViewModels. | | [ViewModelProvider.NewInstanceFactory](https://developer.android.com/reference/android/arch/lifecycle/ViewModelProvider.NewInstanceFactory) | Simple factory, which calls empty constructor on the give class. | | [ViewModelProviders](https://developer.android.com/reference/android/arch/lifecycle/ViewModelProviders) | Utilities methods for[ViewModelStore](https://developer.android.com/reference/android/arch/lifecycle/ViewModelStore)class. | | [ViewModelProviders.DefaultFactory](https://developer.android.com/reference/android/arch/lifecycle/ViewModelProviders.DefaultFactory) | *This class was deprecated in API level 1.1.0. Use[ViewModelProvider.AndroidViewModelFactory](https://developer.android.com/reference/android/arch/lifecycle/ViewModelProvider.AndroidViewModelFactory)* | | [ViewModelStore](https://developer.android.com/reference/android/arch/lifecycle/ViewModelStore) | Class to store`ViewModels`. | | [ViewModelStoreOwner](https://developer.android.com/reference/android/arch/lifecycle/ViewModelStoreOwner) | A scope that owns[ViewModelStore](https://developer.android.com/reference/android/arch/lifecycle/ViewModelStore). | | [ViewModelStores](https://developer.android.com/reference/android/arch/lifecycle/ViewModelStores) | Factory methods for[ViewModelStore](https://developer.android.com/reference/android/arch/lifecycle/ViewModelStore)class. |