RecyclerView是在安卓5.0推出的新的组件，可以实现ListView，GridView，瀑布流的轻松转化。

简单了解完RecycleView后，那么我们就开始弄一个简单的壁纸的app吧

首先 我们要把RecycleView的jar包导进去,这个在我们下载的sdk里面可以找到，如果没有这里附上地址
http://download.****.net/download/sm16111/10249172

也可按照下面来导入 操作如下

点击File  找到Project Structure

点击+号 选择第一个

然后再里面找到recyclerview

点击ok就完成了第一步导入jar包。

接下来 建一个xml文件，代码如下

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.example.recycler.MainActivity">

    <android.support.v7.widget.RecyclerView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/recyclerview"></android.support.v7.widget.RecyclerView>

</android.support.constraint.ConstraintLayout>

然后新建一个壁纸类

package com.example.recycler;


public class Bizi {
    int imageid;
    String name;

    public Bizi(int imageid, String name) {
        this.imageid = imageid;
        this.name = name;
    }

    public int getImageid() {
        return imageid;
    }

    public void setImageid(int imageid) {
        this.imageid = imageid;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

}

再建一个适配器类

package com.example.recycler;

import android.content.Context;
import android.content.Intent;
import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.media.Image;
import android.support.v7.graphics.Palette;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;

import java.util.List;



public class RecyclerAdater extends RecyclerView.Adapter<MyViewHolder> {
    Context context;
    List<Bizi> bizis;
    Resources resources;
    LayoutInflater inflater;

    public RecyclerAdater(Context context, List<Bizi> bizis) {
        this.context = context;
        this.bizis = bizis;
        this.resources = context.getResources();
        this.inflater = LayoutInflater.from(context);//得到布局填充器
    }

    @Override
    public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = inflater.inflate(R.layout.item,parent,false);
        //将xml布局转化为view对象
        final MyViewHolder myViewHolder =  new MyViewHolder(view);
        myViewHolder.imageView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                int position = myViewHolder.getAdapterPosition();
                Bizi bizi = bizis.get(position);
                int id = bizi.getImageid();
                Toast.makeText(view.getContext(),bizi.getName(),Toast.LENGTH_SHORT).show();;
                Intent intent = new Intent(view.getContext(),Show.class);
                intent.putExtra("id",id);
                view.getContext().startActivity(intent);
            }
        });
        return myViewHolder;
    }
    @Override
    public void onBindViewHolder(MyViewHolder holder, int position) {
        Bizi bizi = bizis.get(position);
        holder.imageView.setImageResource(bizi.getImageid());
        holder.name.setText(bizi.getName());
    }

    @Override
    public int getItemCount() {
        return bizis.size();
    }
}
class MyViewHolder extends RecyclerView.ViewHolder {
    TextView name;
    ImageView imageView;
    public MyViewHolder(View itemView) {
        super(itemView);
        name = (TextView)itemView.findViewById(R.id.bizi);
        imageView = (ImageView) itemView.findViewById(R.id.image);
    }
}

接下来就是MainActivity.java里面的代码

package com.example.recycler;

import android.support.v4.util.ArrayMap;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.DefaultItemAnimator;
import android.support.v7.widget.GridLayoutManager;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.widget.SimpleAdapter;
import android.widget.Toast;

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

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        RecyclerView recyclerView = (RecyclerView)this.findViewById(R.id.recyclerview);
        final List<Bizi> list = new ArrayList<>();

        list.add(new Bizi(R.drawable.p1,"壁纸一"));
        list.add(new Bizi(R.drawable.p2,"壁纸二"));
        list.add(new Bizi(R.drawable.p3,"壁纸三"));
        list.add(new Bizi(R.drawable.p4,"壁纸四"));
        list.add(new Bizi(R.drawable.p5,"壁纸五"));
        list.add(new Bizi(R.drawable.p6,"壁纸六"));
        list.add(new Bizi(R.drawable.p7,"壁纸七"));
        list.add(new Bizi(R.drawable.p8,"壁纸八"));
        list.add(new Bizi(R.drawable.p9,"壁纸九"));
        list.add(new Bizi(R.drawable.p10,"壁纸十"));
        list.add(new Bizi(R.drawable.p11,"壁纸十一"));



        recyclerView.setLayoutManager(new GridLayoutManager(this,2));
//        LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this);
//        linearLayoutManager.setOrientation(LinearLayoutManager.HORIZONTAL);
//        recyclerView.setLayoutManager(linearLayoutManager);
        recyclerView.setItemAnimator(new DefaultItemAnimator());
        RecyclerAdater adapter = new RecyclerAdater(this, list);
        recyclerView.setAdapter(adapter);



    }
}

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