Android ListView实现图文列表显示 Android ListView实现图文列表显示

package com.example.entity;
 
public class Fruit {
 private int imageId;     //使用id锁定水果图片
 private String imageName;   //对应的水果名字
 public Fruit(int imageId, String imageName) {
 super();
 this.imageId = imageId;
 this.imageName = imageName;
 }
 public int getImageId() {
 return imageId;
 }
 public void setImageId(int imageId) {
 this.imageId = imageId;
 }
 public String getImageName() {
 return imageName;
 }
 public void setImageName(String imageName) {
 this.imageName = imageName;
 }
}

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:tools="http://schemas.android.com/tools"
  android:layout_width="match_parent"
  android:layout_height="match_parent">
 
  <ListView
    android:id="@+id/lvFruits"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_alignParentLeft="true"
    android:layout_alignParentTop="true" >
  </ListView>
 
</RelativeLayout>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  android:orientation="horizontal" >
 
  <ImageView
    android:id="@+id/ivImage"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:src="@drawable/ic_launcher" />
 
  <TextView
    android:id="@+id/tvName"
    android:layout_marginLeft="10dp"
    android:layout_gravity="center_vertical"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="TextView" />
 
</LinearLayout>

package com.example.adapter;
 
import java.util.List;
 
import com.example.entity.Fruit;
import com.example.listview.R;
 
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.TextView;
 
public class FruitAdaoper extends ArrayAdapter<Fruit> {  // 适配器，泛型表示想要适配的数据类型
 
 private int resourceId;
 
 public FruitAdaoper(Context context, int textViewResourceId,
  List<Fruit> objects) {             // 第一个参数是上下文环境，第二个参数是每一项的子布局，第三个参数是数据
 super(context, textViewResourceId, objects);
 resourceId = textViewResourceId;          //获取子布局
 }
 
 @Override     //getView方法在每个子项被滚动到屏幕内的时候都会被调用，每次都将布局重新加载一边
 public View getView(int position, View convertView, ViewGroup parent) {//第一个参数表示位置，第二个参数表示缓存布局，第三个表示绑定的view对象
 View view;
 ViewHolder viewHolder;         //实例ViewHolder，当程序第一次运行，保存获取到的控件，提高效率
 if(convertView==null){ 
  viewHolder=new ViewHolder();
  view = LayoutInflater.from(getContext()).inflate(//convertView为空代表布局没有被加载过，即getView方法没有被调用过，需要创建
   resourceId, null);     // 得到子布局，非固定的，和子布局id有关
  viewHolder.ivImage = (ImageView) view.findViewById(R.id.ivImage);//获取控件,只需要调用一遍，调用过后保存在ViewHolder中
  viewHolder.tvName = (TextView) view.findViewById(R.id.tvName);  //获取控件
  view.setTag(viewHolder);
 }else{
  view=convertView;      //convertView不为空代表布局被加载过，只需要将convertView的值取出即可
  viewHolder=(ViewHolder) view.getTag();
 }
 
 Fruit fruit = getItem(position);//实例指定位置的水果
 
 viewHolder.ivImage.setImageResource(fruit.getImageId());//获得指定位置水果的id
 viewHolder.tvName.setText(fruit.getImageName());    //获得指定位置水果的名字
 return view;
 
 }
} 
class ViewHolder{   //当布局加载过后，保存获取到的控件信息。
 ImageView ivImage;
 TextView tvName;
}

package com.example.listview;
 
import java.util.ArrayList;
import java.util.List;
 
import com.example.adapter.FruitAdaoper;
import com.example.entity.Fruit;
 
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;
 
public class MainActivity extends Activity {
 
 private ListView lvFruits;
 private List<Fruit> fruitList = new ArrayList<Fruit>(); //创建集合保存水果信息
 
 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main);
 lvFruits = (ListView) findViewById(R.id.lvFruits);  //获得子布局
 getData();
 FruitAdaoper fruitAdapter = new FruitAdaoper(this,
  R.layout.listview_item, fruitList);     //关联数据和子布局
 lvFruits.setAdapter(fruitAdapter);          //绑定数据和适配器
 
 lvFruits.setOnItemClickListener(new OnItemClickListener() { //点击每一行的点击事件
 
  @Override
  public void onItemClick(AdapterView<?> adapterView, View view, int position,
   long id) {
  Fruit fruit=fruitList.get(position);     //获取点击的那一行
  Toast.makeText(MainActivity.this,fruit.getImageName(),Toast.LENGTH_LONG).show();//使用吐司输出点击那行水果的名字
  }
 });
 }
 
 private void getData() {
 int[] imageIds = { R.drawable.apple_pic, R.drawable.banana_pic,
  R.drawable.cherry_pic, R.drawable.grape_pic,
  R.drawable.mango_pic, R.drawable.orange_pic,
  R.drawable.pear_pic, R.drawable.pineapple_pic,
  R.drawable.strawberry_pic, R.drawable.watermelon_pic };
 String[] names = { "苹果", "香蕉", "樱桃", "葡萄", "芒果", "橘子", "梨", "菠萝", "草莓",
  "西瓜" };
 for(int i=0;i<imageIds.length;i++){         //将数据添加到集合中
  fruitList.add(new Fruit(imageIds[i],names[i])); //将图片id和对应的name存储到一起
 }
 }
 
 @Override
 public boolean onCreateOptionsMenu(Menu menu) {
 getMenuInflater().inflate(R.menu.main, menu);
 return true;
 }
 
}