RecyclerView的ListView布局,GridView的布局，条目分割线,条目增加与删除

//只是一个小小的Demo后面会对RecyclerView进行详细介绍

//效果图在最下面

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;
import android.support.v7.widget.DividerItemDecoration;
import android.support.v7.widget.GridLayoutManager;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.StaggeredGridLayoutManager;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.GridView;
import android.widget.TextView;

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

public class MainActivity extends AppCompatActivity implements View.OnClickListener{

    private Button add,delete,list_view,grid_view,flow_view;
    private RecyclerView recycleview;
    private List<String> list;
    private MyRecyclerViewHolder myRecyclerViewHolder;
    private int content=29;
    private int index;
    private LinearLayoutManager linearLayoutManager;
    private List<Integer> heightList;
    private boolean flag;

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


        add = (Button) findViewById(R.id.add);
        delete = (Button) findViewById(R.id.delete);
        list_view = (Button) findViewById(R.id.list_view);
        grid_view = (Button) findViewById(R.id.grid_view);
        flow_view = (Button) findViewById(R.id.flow_view);
        recycleview = (RecyclerView) findViewById(R.id.recycleview);

        add.setOnClickListener(this);
        delete.setOnClickListener(this);
        list_view.setOnClickListener(this);
        grid_view.setOnClickListener(this);
        flow_view.setOnClickListener(this);


        list = new ArrayList<>();
        for (int i = 0; i < 30; i++) {
            list.add("商品"+i);
        }
        linearLayoutManager = new LinearLayoutManager(MainActivity.this,LinearLayoutManager.VERTICAL,false);
        recycleview.setLayoutManager(linearLayoutManager);
        myRecyclerViewHolder = new MyRecyclerViewHolder();
        recycleview.setAdapter(myRecyclerViewHolder);
        recycleview.addItemDecoration(new DividerItemDecoration(
                this, DividerItemDecoration.VERTICAL));

    }

    @Override
    public void onClick(View v) {
        switch (v.getId()){
            case R.id.add:
                flag = false;
                content++;
                list.add("商品"+content);
                myRecyclerViewHolder = new MyRecyclerViewHolder();
                recycleview.setAdapter(myRecyclerViewHolder);
                break;
            case R.id.delete:
                flag = false;
                list.remove(index);
                myRecyclerViewHolder = new MyRecyclerViewHolder();
                recycleview.setAdapter(myRecyclerViewHolder);
                break;
            case R.id.list_view:
                flag = false;
                linearLayoutManager = new LinearLayoutManager(MainActivity.this,LinearLayoutManager.VERTICAL,false);
                recycleview.setLayoutManager(linearLayoutManager);
                myRecyclerViewHolder = new MyRecyclerViewHolder();
                recycleview.setAdapter(myRecyclerViewHolder);
                break;
            case R.id.grid_view:
                flag = false;
                GridLayoutManager gridLayoutManager = new GridLayoutManager(MainActivity.this,2);
                recycleview.setLayoutManager(gridLayoutManager);
                myRecyclerViewHolder = new MyRecyclerViewHolder();
                recycleview.setAdapter(myRecyclerViewHolder);
                break;
            case R.id.flow_view:
                flag = true;
                heightList = new ArrayList<>();
                for (int i = 0; i < list.size(); i++) {
                    int height = new Random().nextInt(200) + 100;//[100,300)的随机数
                    heightList.add(height);
                }
                StaggeredGridLayoutManager gridLayoutManager1 = new StaggeredGridLayoutManager(3,StaggeredGridLayoutManager.VERTICAL);
                recycleview.setLayoutManager(gridLayoutManager1);
                myRecyclerViewHolder = new MyRecyclerViewHolder();
                recycleview.setAdapter(myRecyclerViewHolder);
                break;
        }
    }

    class MyRecyclerViewHolder extends RecyclerView.Adapter{

        @Override
        public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
            View view = View.inflate(MainActivity.this, R.layout.item_main, null);
            MyViewHolder myViewHolder = new MyViewHolder(view);
            return myViewHolder;
        }

        @Override
        public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
            ((MyViewHolder)holder).tv_name.setText(list.get(position));
            if(flag == true){
                puBuLiu(((MyViewHolder)holder),position);
            }
        }

        @Override
        public int getItemCount() {
            return list.size();
        }
    }
    class MyViewHolder extends RecyclerView.ViewHolder{

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

    public void puBuLiu(RecyclerView.ViewHolder holder,int position){
        ViewGroup.LayoutParams params = ((MyViewHolder) holder).tv_name.getLayoutParams();
        params.height = heightList.get(position);
        ((MyViewHolder)holder).tv_name.setLayoutParams(params);
    }
}