Paging 3 library overview   Part of Android Jetpack.

The Paging library helps you load and display pages of data from a larger dataset from local storage or over network. This approach allows your app to use both network bandwidth and system resources more efficiently. The components of the Paging library are designed to fit into the recommended Android app architecture, integrate cleanly with other Jetpack components, and provide first-class Kotlin support.

Benefits of using the Paging library

The Paging library includes the following features:

  • In-memory caching for your paged data. This ensures that your app uses system resources efficiently while working with paged data.
  • Built-in request deduplication, ensuring that your app uses network bandwidth and system resources efficiently.
  • Configurable RecyclerView adapters that automatically request data as the user scrolls toward the end of the loaded data.
  • First-class support for Kotlin coroutines and Flow, as well as LiveData and RxJava.
  • Built-in support for error handling, including refresh and retry capabilities.

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To import Paging components into your Android app, add the following dependencies to your app's build.gradle file:

dependencies {
  def paging_version = "3.0.0-alpha01"

  implementation "androidx.paging:paging-runtime:$paging_version"

  // alternatively - without Android dependencies for tests
  testImplementation "androidx.paging:paging-common:$paging_version"

  // optional - RxJava2 support
  implementation "androidx.paging:paging-rxjava2:$paging_version"

  // optional - Guava ListenableFuture support
  implementation "androidx.paging:paging-guava:$paging_version"

Library architecture

The Paging library integrates directly into the recommended Android app architecture. The library's components operate in three layers of your app:

  • The repository layer
  • The ViewModel layer
  • The UI layer
Paged data flows from the PagingSource or RemoteMediator components
    in the repository layer to the Pager component in the ViewModel layer.
    Then the Pager component exposes a Flow of PagingData to the
    PagingDataAdapter in the UI layer.
Figure 1. An example of how the Paging library fits into your app architecture.

This section describes the Paging library components that operate at each layer and how they work together to load and display paged data.

Repository layer

The primary Paging library component in the repository layer is PagingSource. Each PagingSource object defines a source of data and how to retrieve data from that source. A PagingSource object can load data from any single source, including network sources and local databases.

Another Paging library component that you might use is RemoteMediator. A RemoteMediator object handles paging from a layered data source, such as a network data source with a local database cache.

ViewModel layer

The Pager component provides a public API for constructing instances of PagingData that are exposed in reactive streams, based on a PagingSource object and a PagingConfig configuration object.

The component that connects the ViewModel layer to the UI is PagingData. A PagingData object is a container for a snapshot of paginated data. It queries a PagingSource object and stores the result.

UI layer

The primary Paging library component in the UI layer is PagingDataAdapter, a RecyclerView adapter that handles paginated data.

Alternatively, you can use the included AsyncPagingDataDiffer component to build your own custom adapter.

Additional resources

To learn more about the Paging library, see the following additional resources: