Android Paging Library - Displaying an Infinite List of Positive and Negative Page Numbers

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Final Result

    

Detailed Tutorial

Android Infinite List - Combining RecyclerView and Android Paging Library

When to Use Which DataSource?

ItemKeyedDataSource

Do：When keys are continuous for a Data Item in RecyclerView, use the Data’s Key to find the previous or next piece of data

PageKeyedDataSource 

Do: When the data source (from a cloud server or other data source) already has a paging function, use the Key of every page to get data

PositionalDataSource

Do: Use RecyclerView’s absolute position to decide data placement