The SQLiteCursor refreshes this window each time you request a row that isn’t present. The first read initializes a CursorWindow, a buffer of rows typically 2MB in size, with content from the database. It allows you to view large query results with a fixed initial loading cost. SQLiteCursor is the return type for an Android SQLite database query. In this blogpost, we’ll go over its problems, and why that motivates us to use small queries with the Room Persistence and Paging libraries in the Android Architecture Components. Before starting the new Paging Library, we investigated existing paging approaches in the platform, especially the potential pitfalls in SQLiteCursor. SQLite is a great way to persist many thousands of items of data on Android, but presenting these huge data sets in UI has historically been difficult, and can lead to performance issues.
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