recyclerview-selection如何监听事件onSelectionEnter和事件onS

我找到解决方案：

  selectionTracker.addObserver(new SelectionTracker.SelectionObserver() {
        @Override
        public void onItemStateChanged(@NonNull Object key, boolean selected) {
            super.onItemStateChanged(key, selected);
            Selection selection = selectionTracker.getSelection();
            if (selected && selection.size() == 1) {
                if (onSelectionEnter != null) {
                    onSelectionEnter.run();
                }
            } else if (!selected && selection.size() == 0) {
                if (onSelectionExit != null) {
                    onSelectionExit.run();
                }
            }
        }
    });