Package 

Interface ListUpdateCallback

  • 
public interface ListUpdateCallback

    An interface that can receive Update operations that are applied to a list.

    This class can be used together with DiffUtil to detect changes between two lists.

    • Method Summary

      Modifier and Type Method Description
      abstract void onInserted(int position, int count) Called when {@code count} number of items are inserted at the given position.
      abstract void onRemoved(int position, int count) Called when {@code count} number of items are removed from the given position.
      abstract void onMoved(int fromPosition, int toPosition) Called when an item changes its position in the list.
      abstract void onChanged(int position, int count, @Nullable() Object payload) Called when {@code count} number of items are updated at the given position.

      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

    • Method Detail

      • onInserted

         abstract void onInserted(int position, int count)

        Called when {@code count} number of items are inserted at the given position.

        Parameters:
        position - The position of the new item.
        count - The number of items that have been added.

      • onRemoved

         abstract void onRemoved(int position, int count)

        Called when {@code count} number of items are removed from the given position.

        Parameters:
        position - The position of the item which has been removed.
        count - The number of items which have been removed.

      • onMoved

         abstract void onMoved(int fromPosition, int toPosition)

        Called when an item changes its position in the list.

        Parameters:
        fromPosition - The previous position of the item before the move.
        toPosition - The new position of the item.

      • onChanged

         abstract void onChanged(int position, int count, @Nullable() Object payload)

        Called when {@code count} number of items are updated at the given position.

        Parameters:
        position - The position of the item which has been updated.
        count - The number of items which has changed.