ItemTouchHelper之SwipeDismiss

引用

This is a utility class to add swipe to dismiss and drag & drop support to RecyclerView.

它是一个非常强大的工具,感觉跟ViewDragHelper一样,不过ItemTouchHelper顾名思义是处理item的touch事件的.
它能够让你非常容易实现侧滑删除,拖拽的功能.

今天,就拿它来实现以下侧滑删除!~

开始
首先我们看下ItemTouchHelper的构造方法ItemTouchHelper(Callback callback) 它需要我们传入一个Callback
而刚好Android非常任性,已经帮我们实现了一个:SimpleCallback

甚至,在注释里已经给我们写好了样例!!!有兴趣的同学可以去看看,这里就不给出了.

接下来上代码!~

定义一个Adapter
这个adapter没什么特别的,挺简单的,相信大家会

public static class ListAdapter extends RecyclerView.Adapter<ListAdapter.ViewHolder> implements View.OnClickListener{
        private Context mContext;
        private List<String>mDatas;
        public ListAdapter(Context context,List<String> data){
            mDatas= data;
            mContext = context;
        }
        @Override
        public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
 
            View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.material_list_item, parent, false);
            return new ViewHolder(view);
        }
 
        @Override
        public void onBindViewHolder(ViewHolder holder, int position) {
            holder.text.setText(mDatas.get(position));
 
            holder.text.setTag(position);
            holder.text.setOnClickListener(this);
        }
 
        @Override
        public int getItemCount() {
            return mDatas.size();
        }
 
        @Override
        public void onClick(View v) {
            TextView tv = (TextView) v;
            Toast.makeText(mContext, tv.getText()+";;"+tv.getTag(), Toast.LENGTH_SHORT).show();
        }
 
        public static class ViewHolder extends RecyclerView.ViewHolder{
 
            TextView text;
            public ViewHolder(View view){
                super(view);
                text = (TextView) view.findViewById(R.id.iv_item);
            }
        }
 
    }

定义一个RecyclerView
设置为垂直list的样式,并且与上面的Adapter关联

mRvList.setLayoutManager(new LinearLayoutManager(getActivity(), LinearLayoutManager.VERTICAL, false));
mRvList.setAdapter(mAdapter);

实例化一个ItemTouchHelper
再实例化ItemTouchHelper之前我们再看一下SimpleCallback的构造方法:

ItemTouchHelper.SimpleCallback(int dragDirs, int swipeDirs)

dragDirs 代表你想拖拽的方向

swipeDirs 你想滑动的方向

都分别有一下值,很好理解:

LEFT

RIGHT

START

END

UP

DOWN

动手

// 0 代表我不拖拽, ItemTouchHelper.RIGHT代表我往右滑动
 
new ItemTouchHelper(new ItemTouchHelper.SimpleCallback(0, ItemTouchHelper.RIGHT) {
 
            //在这个回调 我们处理滑动
            @Override
            public void onSwiped(RecyclerView.ViewHolder viewHolder, int direction) {
                Log.d(TAG, "onSwiped() called with " + "viewHolder = [" + viewHolder + "], direction = [" + direction + "]");
                //这里我们通过viewHolder获取position
                int position = viewHolder.getAdapterPosition();
                mData.remove(position);
                mAdapter.notifyItemRemoved(position);
                Toast.makeText(getActivity(), "拆散的position:"+position, Toast.LENGTH_SHORT).show();
            }
 
            // 暂时不处理移动事件...
            @Override
            public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, RecyclerView.ViewHolder target) {
                Log.d(TAG, "onMove() called with " + "recyclerView = [" + recyclerView + "], viewHolder = [" + viewHolder + "], target = [" + target + "]");
                return false;
            }
 
        }).attachToRecyclerView(mRvList);

http://www.jcodecraeer.com/a/anzhuokaifa/androidkaifa/2015/0822/3349.html
http://blog.csdn.net/easion_zms/article/details/47147191

http://www.open-open.com/lib/view/open1435287807716.html

RecyclerView的拖动和滑动 第一部分 ：基本的ItemTouchHelper示例
http://www.jcodecraeer.com/a/anzhuokaifa/androidkaifa/2015/0630/3123.html
RecyclerView的拖动和滑动 第二部分 ：拖块，Grid以及自定义动画
http://www.jcodecraeer.com/a/anzhuokaifa/androidkaifa/2015/0724/3219.html

非常易于使用的滑动删除库，用于Android的RecyclerView，支持水平方向和竖直方向的滑动删除。
http://www.open-open.com/lib/view/open1445773975085.html