Pagination in Android with Paging 3

 

Overview

Paging 3 concept introduced in the Android Jetpack component that helps you to display pages of data from a large number of data from local databases or remote data servers. By using the Paging 3 library, we can load a lot of data efficiently and seamlessly, only we will list or display the data based on user needs. The Paging 3 library is written entirely using Kotlin Coroutines.

Advantages

  • In-memory cache.
    •  
  • Kotlin low and LiveData support.
    •  
  • Error handling, refresh and retry capabilities.
    •  
  • Loading partial data based on user needs reduces the usages of network bandwidth and system resources.

Architecture

The Paging library can easily integrate with recommended Android app architecture. The library's components communicate with three layers of the app:

  1. Repository
  2. ViewModel
  3. View

Architecture Repository ViewModel View

Repository

In the Repository layer, there is the PagingSource. The PagingSource defines a data source and how to retrieve data from the data source. Also, we can load from a remote data source or local database.

In the Repository layer, there is the RemoteMediator. The RemoteMediator manages the paging from a layered data source.

ViewModel

The Pager component helps us to create instances of PagingData that are sent to the View. pager instance based on a PagingSource and a PagingConfig configuration.

View

Inside the View section, there is the PagingDataAdapter and a RecyclerView adapter that help you to display paginate data.

Implementation

dependencies {
     implementation "androidx.paging:paging-runtime:3.0.1"
}

Creating a Data Source


Continue Reading: Paging 3

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