Android UI高級之RecyclerView

實現左滑刪除條目

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.helper.ItemTouchHelper;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

import com.example.longyang.removercyclerview.view.MyRecyclerView;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity {

    List<String> listitem = new ArrayList<>();
    private MyAdapter myAdapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        for (int i = 0; i < 20; i++) {
            listitem.add("條目-》" + i);
        }

        LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this);

        MyRecyclerView rlv = (MyRecyclerView) findViewById(R.id.rl);
        myAdapter = new MyAdapter(listitem);

        rlv.setLayoutManager(linearLayoutManager);
        rlv.setAdapter(myAdapter);

        itemTouchHelper.attachToRecyclerView(rlv);
    }

    class MyAdapter extends RecyclerView.Adapter<MyAdapter.MyViewHolder> {

        List<String> listitem;

        public MyAdapter(List<String> listitem) {
            this.listitem = listitem;
        }

        @Override
        public MyAdapter.MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {

            View view = LayoutInflater.from(MainActivity.this).inflate(R.layout.item, null);
            MyViewHolder viewHolder = new MyViewHolder(view);
            return viewHolder;
        }

        @Override
        public void onBindViewHolder(MyAdapter.MyViewHolder holder, int position) {

            holder.tv_item.setText(listitem.get(position));
        }

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

        class MyViewHolder extends RecyclerView.ViewHolder {

            private final TextView tv_item;

            public MyViewHolder(View itemView) {
                super(itemView);
                tv_item = (TextView) itemView.findViewById(R.id.tv_item);
            }
        }
    }

    ItemTouchHelper itemTouchHelper = new ItemTouchHelper(new ItemTouchHelper.SimpleCallback(0, ItemTouchHelper.LEFT | ItemTouchHelper.RIGHT) {

        @Override
        public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, RecyclerView.ViewHolder target) {

            //處理拖拽的事件
            return false;
        }

        @Override

        public void onSwiped(RecyclerView.ViewHolder viewHolder, int direction) {
            // 處理滑動事件回調

            final int pos = viewHolder.getAdapterPosition();

            listitem.remove(pos);

            myAdapter.notifyItemRemoved(pos);
        }
    });
}