Steps for migration to 3.0

Step 1: Replace DiffCallback to DefaultDiffCallback

 public class YourDiffCallback
-		extends DiffCallback<ViewModel> {
+		extends DefaultDiffCallback<ViewModel> {


-	public boolean areContentsTheSame(ViewModel oldItemPosition, ViewModel newItemPosition) {
-		return oldItemPosition.equals(newItemPosition);
-	}

-	public Object getChangePayload(int oldItemPosition, int newItemPosition) {
-		final ViewModel newItem = mNewItems.get(newItemPosition);
-		final ViewModel oldItem = mOldItems.get(oldItemPosition);
-
+	public Object getChangePayload(ViewModel oldItem, ViewModel newItem) {
		//your code
-		return super.getChangePayload(oldItemPosition, newItemPosition);
+		return super.getChangePayload(oldItem, newItem);
	}
}