Diffutil in recycleview, making it autoscroll if a new item is added

Question

If we use DiffUtil.Callback, and do

adapter.setItems(itemList);
diff.dispatchUpdatesTo(adapter);

how can we make sure that ad

Answer 1

There's an easy way to do this that also preserves the user's scroll position if items are inserted outside the viewable area:

import android.os.Parcelable;

Parcelable recyclerViewState = recyclerView.getLayoutManager().onSaveInstanceState();
// apply diff result here (dispatch updates to the adapter)
recyclerView.getLayoutManager().onRestoreInstanceState(recyclerViewState);              

Using this approach, the new items are made visible if they are inserted where the user can see them -- but the user's viewpoint is preserved if the items are inserted outside of view.