BaseRecyclerViewAdapterHelper之BaseItemDraggableAdapter实现拖拽功能-优快云博客

本文介绍如何利用BaseRecyclerViewAdapterHelper的子类BaseItemDraggableAdapter，实现在Android应用中的RecyclerView拖拽排序功能。通过创建RectclerItem实体类、定义item布局view_list_item，以及设置适配器ItemDraggableAdapter，最终在ItemDraggableActivity中完成拖拽操作。

一个实体类RectclerItem（同上）
一个item(view_list_item)的视图文件（同上）
适配器ItemDraggableAdapter

public class ItemDraggableAdapter extends BaseItemDraggableAdapter<RecyclerItem,BaseViewHolder> {

    public ItemDraggableAdapter(int layoutResId, List<RecyclerItem> data) {
        super(layoutResId, data);
    }

    @Override
    protected void convert(BaseViewHolder helper, RecyclerItem item) {
        helper.setText(R.id.list_item_title_tv,item.getTitle())
                .setText(R.id.list_item_content_tv,item.getContent());
    }
}

ItemDraggableActivity

public class ItemDraggableActivity extends BaseRecyclerViewActivity {

    private ItemDraggableAdapter itemDraggableAdapter;

    @Override
    protected int getLayoutResId() {
        return super.getLayoutResId();
    }

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        titleNameTv.setText("BaseItemDraggableAdapter实现拖拽");
        itemDraggableAdapter = new ItemDraggableAdapter(R.layout.view_list_item,getListData(20));
        itemDraggableAdapter.openLoadAnimation(BaseQuickAdapter.SLIDEIN_RIGHT);
        recyclerView.setAdapter(itemDraggableAdapter);

        ItemDragAndSwipeCallback itemDragAndSwipeCallback 
                = new ItemDragAndSwipeCallback(itemDraggableAdapter);
        ItemTouchHelper itemTouchHelper = new ItemTouchHelper(itemDragAndSwipeCallback);
        itemTouchHelper.attachToRecyclerView(recyclerView);

        // 开启拖拽
        itemDraggableAdapter.enableDragItem(itemTouchHelper,R.id.view_list_item_ll,true);
        itemDraggableAdapter.setOnItemDragListener(onItemDragListener);

        // 开启滑动删除
        itemDraggableAdapter.enableSwipeItem();
        itemDraggableAdapter.setOnItemSwipeListener(onItemSwipeListener);
    }

    @Override
    protected void onRefreshComplete() {
        itemDraggableAdapter.addData(0,getListData(3));
        recyclerView.scrollToPosition(0);
    }

    OnItemDragListener onItemDragListener = new OnItemDragListener() {
        @Override
        public void onItemDragStart(RecyclerView.ViewHolder viewHolder, int pos) {
            ToastUtils.showShortToast("你在拖拽第" + (pos + 1) + "个位置的item哦！");
        }

        @Override
        public void onItemDragMoving(RecyclerView.ViewHolder source, int from, 
                                     RecyclerView.ViewHolder target, int to) {

        }

        @Override
        public void onItemDragEnd(RecyclerView.ViewHolder viewHolder, int pos) {
            ToastUtils.showShortToast("拖拽到了第" + (pos + 1) + "个位置哦！");
        }
    };

    OnItemSwipeListener onItemSwipeListener = new OnItemSwipeListener() {
        @Override
        public void onItemSwipeStart(RecyclerView.ViewHolder viewHolder, int pos) {
            ToastUtils.showShortToast("继续向左滑动即可删除第" + (pos + 1) + "个位置的item");
        }

        @Override
        public void clearView(RecyclerView.ViewHolder viewHolder, int pos) {

        }

        @Override
        public void onItemSwiped(RecyclerView.ViewHolder viewHolder, int pos) {
            ToastUtils.showShortToast("删除了第" + (pos + 1) + "个位置的item哦");
        }

        @Override
        public void onItemSwipeMoving(Canvas canvas, RecyclerView.ViewHolder viewHolder, 
                                      float dX, float dY, boolean isCurrentlyActive) {

        }
    };

}