package com.test.recycleview;

import android.app.Activity;

import android.graphics.Canvas;

import android.graphics.Color;

import android.graphics.Paint;

import android.os.Bundle;

import android.support.v7.widget.LinearLayoutManager;

import android.support.v7.widget.RecyclerView;

import android.view.Gravity;

import android.view.MotionEvent;

import android.view.View;

import android.view.ViewGroup;

import android.widget.TextView;

import android.widget.Toast;

import java.util.ArrayList;

/**

 * test recyleView

 */

public class MainActivity extends Activity{

    private RecyclerView recyclerView;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        recyclerView=new RecyclerView(this);

        ViewGroup.LayoutParams params=new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT);

        setContentView(recyclerView,params);

        initRecycleView();

        initData();

    }

    private void initRecycleView(){

        LinearLayoutManager manager=new LinearLayoutManager(this);

        recyclerView.setLayoutManager(manager);

        recyclerView.addOnItemTouchListener(new RecyclerView.OnItemTouchListener() {

            @Override

            public boolean onInterceptTouchEvent(RecyclerView recyclerView, MotionEvent event) {

                return false;

            }

            @Override

            public void onTouchEvent(RecyclerView recyclerView, MotionEvent event) {

            }

        });

        recyclerView.addItemDecoration(new RecyclerView.ItemDecoration() {

            @Override

            public void onDrawOver(Canvas c, RecyclerView parent, RecyclerView.State state) {

                super.onDraw(c, parent, state);

                Paint paint=new Paint();

                paint.setColor(Color.GRAY);

                paint.setStrokeWidth(3);

                for (int i = 0, size = parent.getChildCount(); i < size; i++) {

                    View child = parent.getChildAt(i);

                    c.drawLine(0, child.getBottom(), parent.getRight(), child.getBottom(), paint);

                }

            }

        });

    }

    public void initData(){

        ArrayList<String> data=new ArrayList<String>(50);

        for (int i=0;i<100;i++){

            data.add(String.valueOf(i));

        }

        recyclerView.setAdapter(new MyAdapter(data));

    }

    public class MyAdapter extends RecyclerView.Adapter{

        ArrayList<String> data;

        public MyAdapter(ArrayList<String> data) {

            this.data = data;

        }

        @Override

        public ViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {

            View view=View.inflate(MainActivity.this, android.R.layout.simple_list_item_1,null);

            ViewGroup.LayoutParams params=new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT);

            view.setLayoutParams(params);

            return new ViewHolder(view);

        }

        @Override

        public void onBindViewHolder(RecyclerView.ViewHolder viewHolder, int i) {

            ((ViewHolder)viewHolder).textView.setText(String.valueOf(i));

        }

        @Override

        public int getItemCount() {

            return data.size();

        }

        private class ViewHolder extends RecyclerView.ViewHolder{

            public TextView textView;

            public ViewHolder(View itemView) {

                super(itemView);

                textView= (TextView) itemView;

                textView.setGravity(Gravity.CENTER);

                itemView.setOnClickListener(new View.OnClickListener() {

                    @Override

                    public void onClick(View v) {

                        Toast.makeText(MainActivity.this,"click postion:"+getPosition()+" content: "+textView.getText(),Toast.LENGTH_LONG).show();

                    }

                });

            }

        }

    }

}