recycleview仿网易频道管理（代码总共不到600行）

最新推荐文章于 2021-05-25 20:12:26 发布

原创最新推荐文章于 2021-05-25 20:12:26 发布 · 572 阅读

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#移动 #网易

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本文介绍了一个基于RecycleView实现的简易频道管理Demo，包括拖拽移动、拖拽删除等功能，涉及六个类不超过600行代码。提供源码下载。

前言
之前用csdn上的网易频道管理的demo，代码量太大。最近自己用recycleview修改一下，总共使用了六个类，不会超过600行的代码。和大家交流。


/**
 * 处理RecycleView的选中,拖拽移动,拖拽删除的实现类

 */
public class SimpleItemTouchHelperCallback extends ItemTouchHelper.Callback {

    private ItemTouchHelperAdapter mAdapter;

    public SimpleItemTouchHelperCallback(ItemTouchHelperAdapter adapter) {
        mAdapter = adapter;
    }

    @Override
    public int getMovementFlags(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder) {
        int dragFlags = ItemTouchHelper.UP | ItemTouchHelper.DOWN | ItemTouchHelper.LEFT | ItemTouchHelper.RIGHT; //允许上下左右的拖动
        return makeMovementFlags(dragFlags, 0);
    }

    @Override
    public boolean isLongPressDragEnabled() {
        return false;//长按启用拖拽
    }

    @Override
    public boolean isItemViewSwipeEnabled() {
        return false; //不启用拖拽删除
    }

    @Override
    public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder source, RecyclerView.ViewHolder target) {
        //通过接口传递拖拽交换数据的起始位置和目标位置的ViewHolder
        mAdapter.onItemMove(source, target);
        return true;
    }


    @Override
    public void onSwiped(RecyclerView.ViewHolder viewHolder, int direction) {
        //移动删除回调,如果不用可以不用理
       // mAdapter.onItemDissmiss(viewHolder);
    }

    @Override
    public void onSelectedChanged(RecyclerView.ViewHolder viewHolder, int actionState) {
        super.onSelectedChanged(viewHolder, actionState);
        if (actionState != ItemTouchHelper.ACTION_STATE_IDLE) {
            //当滑动或者拖拽view的时候通过接口返回该ViewHolder
            mAdapter.onItemSelect(viewHolder);
        }
    }

    @Override
    public void clearView(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder) {
        super.clearView(recyclerView, viewHolder);
        if (!recyclerView.isComputingLayout()) {
            //当需要清除之前在onSelectedChanged或者onChildDraw,onChildDrawOver设置的状态或者动画时通过接口返回该ViewHolder
            mAdapter.onItemClear(viewHolder);
        }
    }
}

由于其他频道和我的频道中的1和 2不能拖拽，所以SimpleItemTouchHelperCallback extends ItemTouchHelper.Callback 中的isLongPressDragEnabled()，禁止拖拽，重写点击事件和长按点击事件，调用 touchHelper.startDrag(childViewViewHolder)来执行拖拽

public boolean isLongPressDragEnabled() {
        return false;//长按启用拖拽
    }

在下面的RecyclerItemClickListener 用来重写点击事件和长按点击事件

public class RecyclerItemClickListener implements RecyclerView.OnItemTouchListener{
    private View childView;
    private RecyclerView touchView;
    private RecyclerView.ViewHolder viewHolder;
    GestureDetector mGestureDetector;

    public RecyclerItemClickListener(Context context, final OnItemClickListener mListener) {
        mGestureDetector = new GestureDetector(context, new GestureDetector.SimpleOnGestureListener(){
            @Override
            public boolean onSingleTapUp(MotionEvent ev) {
                if (childView != null && mListener != null) {
                    mListener.onItemClick(childView, touchView.getChildPosition(childView),viewHolder);
                }
                return true;
            }
            @Override
            public void onLongPress(MotionEvent ev) {
                if (childView != null && mListener != null) {
                    mListener.onLongClick(childView, touchView.getChildPosition(childView),viewHolder);
                }
            }
        });
    }



    public interface OnItemClickListener {
        public void onItemClick(View view, int position, RecyclerView.ViewHolder viewHolder);
        public void onLongClick(View view, int posotion, RecyclerView.ViewHolder viewHolder);
    }

    @Override
    public boolean onInterceptTouchEvent(RecyclerView recyclerView, MotionEvent motionEvent) {
        mGestureDetector.onTouchEvent(motionEvent);
        childView = recyclerView.findChildViewUnder(motionEvent.getX(), motionEvent.getY());
        touchView = recyclerView;
        if (childView!=null){
            viewHolder = recyclerView.getChildViewHolder(childView);
        }
        return false;
    }

    @Override
    public void onTouchEvent(RecyclerView recyclerView, MotionEvent motionEvent) {

    }

    @Override
    public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) {

    }
}