仿网易栏目添加功能

implementation 'com.android.support:recyclerview-v7:26.1.0'

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">

    <stroke android:width="1dp" android:color="#aaa"/>

    <solid android:color="#eee"/>

    <corners android:radius="5dp"/>

</shape>

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    mRecycleSelected = (RecyclerView) findViewById(R.id.recycle_selected);
    mRecycleUnSelected = (RecyclerView) findViewById(R.id.recycle_unselected);
    mFinishedText = (TextView) findViewById(R.id.tv_finish);

    initData();
    initView();
    initEvent();
}

public class SelectedRecycleAdapter extends RecyclerView.Adapter<SelectedRecycleAdapter.MyViewHolder>
        implements ItemTouchHelperCallback.OnItemPositionChangeListener {

    private List<String> mDatas;
    private MainActivity mContext;

    public interface OnItemClickListener {
        void onItemClickListener(MyViewHolder viewHolder, int pos);

        void onItemLongClickListener(MyViewHolder viewHolder, int pos);
    }

    public interface OnDeleteIconClickListener {
        void onDeleteIconClick(int pos);
    }

    private OnItemClickListener mListener;
    private OnDeleteIconClickListener mDeleteListener;

    public void setOnItemClickListener(OnItemClickListener listener) {
        this.mListener = listener;
    }

    public void setOnDeleteIconClickListener(OnDeleteIconClickListener listener) {
        mDeleteListener = listener;
    }

    public SelectedRecycleAdapter(Context context, List<String> datas) {
        mDatas = datas;
        mContext = (MainActivity) context;
    }

    @Override
    public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View itemView = LayoutInflater.from(mContext).inflate(R.layout.item, parent, false);
        MyViewHolder viewHolder = new MyViewHolder(itemView);

        return viewHolder;
    }

    @Override
    public void onBindViewHolder(final MyViewHolder holder, final int position) {
        holder.tv.setText(mDatas.get(position));

        if (mContext.isDeleteIconsShow()) {
            holder.ivDelete.setVisibility(View.VISIBLE);
        } else {
            holder.ivDelete.setVisibility(View.INVISIBLE);
        }

        holder.ivDelete.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (mDeleteListener != null) {
                    mDeleteListener.onDeleteIconClick(holder.getLayoutPosition());
                }
            }
        });

        if (mListener != null) {
            holder.itemView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    mListener.onItemClickListener(holder, position);
                }
            });

            holder.itemView.setOnLongClickListener(new View.OnLongClickListener() {
                @Override
                public boolean onLongClick(View v) {
                    mListener.onItemLongClickListener(holder, position);
                    return false;
                }
            });
        }

    }

    @Override
    public int getItemCount() {
        return mDatas.size();
    }

    //根据用户的手势，交换Adapter数据集中item的位置
    @Override
    public boolean onItemMove(int fromPos, int toPos) {
        Collections.swap(mDatas, fromPos, toPos);
        notifyItemMoved(fromPos, toPos);
        return true;
    }

    public void addData(String data, int pos) {
        mDatas.add(pos, data);
        notifyItemInserted(pos);
    }

    public void removeData(int pos) {
        mDatas.remove(pos);

        notifyDataSetChanged();
        notifyItemRemoved(pos);
    }

    class MyViewHolder extends RecyclerView.ViewHolder {
        TextView tv;
        ImageView ivDelete;

        public MyViewHolder(View itemView) {
            super(itemView);

            tv = (TextView) itemView.findViewById(R.id.tv);
            ivDelete = (ImageView) itemView.findViewById(R.id.delelte);
        }
    }
}

mSelectedAdatper.setOnItemClickListener(new SelectedRecycleAdapter.OnItemClickListener() {
    @Override
    public void onItemClickListener(SelectedRecycleAdapter.MyViewHolder viewHolder, int pos) {
        if (!isDeleteIconsShow) {
            Toast.makeText(MainActivity.this, mSelectedDatas.get(pos), Toast.LENGTH_SHORT).show();
        }
    }

    @Override
    public void onItemLongClickListener(SelectedRecycleAdapter.MyViewHolder viewHolder, int pos) {
        if (!isDeleteIconsShow) {
            showAllDeleteIcons();

            mFinishedText.setVisibility(View.VISIBLE);
        }
    }
});

/**
 * This is a utility class to add swipe to dismiss and drag & drop support to RecyclerView.
 * <p>
 * It works with a RecyclerView and a Callback class, which configures what type of interactions
 * are enabled and also receives events when user performs these actions.
 * <p>
 * Depending on which functionality you support, you should override
 * {@link Callback#onMove(RecyclerView, ViewHolder, ViewHolder)} and / or
 * {@link Callback#onSwiped(ViewHolder, int)}.
 * <p>
 * This class is designed to work with any LayoutManager but for certain situations, it can be
 * optimized for your custom LayoutManager by extending methods in the
 * {@link ItemTouchHelper.Callback} class or implementing {@link ItemTouchHelper.ViewDropHandler}
 * interface in your LayoutManager.
 * <p>
 * By default, ItemTouchHelper moves the items' translateX/Y properties to reposition them. You can
 * customize these behaviors by overriding {@link Callback#onChildDraw(Canvas, RecyclerView,
 * ViewHolder, float, float, int, boolean)}
 * or {@link Callback#onChildDrawOver(Canvas, RecyclerView, ViewHolder, float, float, int,
 * boolean)}.
 * <p/>
 * Most of the time you only need to override <code>onChildDraw</code>.
 */

//根据用户的手势，交换Adapter数据集中item的位置
@Override
public boolean onItemMove(int fromPos, int toPos) {
    Collections.swap(mDatas, fromPos, toPos);
    notifyItemMoved(fromPos, toPos);
    return true;
}