package com.itheima74.recyclerview; 
 
import android.os.Bundle; 
import android.support.v7.app.AppCompatActivity; 
import android.support.v7.widget.GridLayoutManager; 
import android.support.v7.widget.RecyclerView; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.ImageView; 
import android.widget.TextView; 
 
import java.util.ArrayList; 
 
/** 
 * RecyclerView 
 * 1.增强版的listview 
 * 2.官方推荐 
 * 3.使用步骤: 
 * a.build.gradle文件中添加依赖compile 'com.android.support:recyclerview-v7:25.2.0' 
 * b.xml布局中引入,注意完整包名+类名 
 * c.具体见代码 
 */ 
public class MainActivity extends AppCompatActivity { 
 
 ArrayList mFruitList; 
 private RecyclerView recyclerview; 
 
 @Override 
 protected void onCreate(Bundle savedInstanceState) { 
 super.onCreate(savedInstanceState); 
 setContentView(R.layout.activity_main); 
 
 initView(); 
 initData(); 
 initAdapter(); 
 } 
 
 /** 
 * 初始化数据适配器 
 */ 
 private void initAdapter() { 
 recyclerview.setAdapter(new FruitAdapter()); 
 } 
 
 /** 
 * 初始化控件 
 */ 
 private void initView() { 
 recyclerview = (RecyclerView) findViewById(R.id.recyclerview); 
 
 // 设置为LinearLayoutManager布局方式,线性布局 
 // LinearLayoutManager layoutManager = new LinearLayoutManager(this); 
 // 两种方式,水平或垂直排布,默认垂直排布 
 // layoutManager.setOrientation(LinearLayoutManager.HORIZONTAL); 
 // recyclerview.setLayoutManager(layoutManager); 
 
 // 设置为GridLayoutManager布局方式,3列排布 
 GridLayoutManager gridLayoutManager = new GridLayoutManager(this,3); 
 recyclerview.setLayoutManager(gridLayoutManager); 
 } 
 
 /** 
 * 初始化数据,水果集合 
 */ 
 private void initData() { 
 mFruitList = new ArrayList<>(); 
 mFruitList.add(new Fruit("apple", R.drawable.apple_pic)); 
 mFruitList.add(new Fruit("banana", R.drawable.banana_pic)); 
 mFruitList.add(new Fruit("cherry", R.drawable.cherry_pic)); 
 mFruitList.add(new Fruit("grape", R.drawable.grape_pic)); 
 mFruitList.add(new Fruit("mango", R.drawable.mango_pic)); 
 mFruitList.add(new Fruit("orange", R.drawable.orange_pic)); 
 mFruitList.add(new Fruit("pear", R.drawable.pear_pic)); 
 mFruitList.add(new Fruit("pineapple", R.drawable.pineapple_pic)); 
 mFruitList.add(new Fruit("strawberry", R.drawable.strawberry_pic)); 
 mFruitList.add(new Fruit("watermelon", R.drawable.watermelon_pic)); 
 } 
 
 class FruitAdapter extends RecyclerView.Adapter { 
 
 // 返回ViewHolder对象 
 @Override 
 public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { 
 return new ViewHolder(View.inflate(getApplicationContext(), R.layout.listview_item, null)); 
 } 
 
 // 刷新界面,为ViewHolder两个属性设置内容 
 @Override 
 public void onBindViewHolder(ViewHolder holder, int position) { 
 Fruit fruit = mFruitList.get(position); 
 holder.iv.setImageResource(fruit.imageId); 
 holder.tv.setText(fruit.name); 
 } 
 
 @Override 
 public int getItemCount() { 
 // FruitAdapter是MainActivity的内部类,可以直接使用外部类的成员变量 
 return mFruitList.size(); 
 } 
 } 
 
 static class ViewHolder extends RecyclerView.ViewHolder { 
 ImageView iv; 
 TextView tv; 
 
 ViewHolder(View itemView) { 
 super(itemView); 
 iv = (ImageView) itemView.findViewById(R.id.iv); 
 tv = (TextView) itemView.findViewById(R.id.tv); 
 } 
 } 
 
 
} 

package com.itheima74.recyclerview; 
 
/** 
 * Created by My on 2017/3/2. 
 */ 
 
class Fruit { 
 String name; 
 int imageId; 
 
 Fruit(String name, int imageId) { 
 this.name = name; 
 this.imageId = imageId; 
 } 
}