Android Recyclerview Poor Performance After API 27 To 29 Migration

Migrated app to support latest API 29. All has gone very well, app functions correctly, except for one perplexing issue; A recyclerview is populated using a SQLite query, which ma

Solution 1:

Also noticed that once, that it became quite sluggish ...

The problem is likely that NestedScrollView > LinearLayout > RecyclerView.

Also that include is pretty useless, with one single node contained.... you have to nest it like this:

<androidx.core.widget.NestedScrollView
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:isScrollContainer="true"
    android:longClickable="false"
    android:measureAllChildren="true"
    app:layout_behavior="@string/appbar_scrolling_view_behavior">

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/recyclerview"
        tools:listitem="@layout/cardview"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:color="?android:colorControlHighlight"
        android:fastScrollEnabled="true"
        android:gravity="start"
        android:scrollbarStyle="insideInset"
        android:scrollbars="vertical"
        android:splitMotionEvents="false"
        android:verticalScrollbarPosition="right"/>

</androidx.core.widget.NestedScrollView>