Android Studio用法之ListView(图文并茂的listview界面)

首先准备好一组图片，分别对应列表中的每一种水果，待会我们要让这些水果的旁边都有一个图样。
接着我们定义一个实体类，作为ListView适配类型，新建Fruit，代码如下：
package com.android.uilayouttest;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;

public class Fruit extends AppCompatActivity {
private String name;
private int imageId;
public Fruit (String name,int imageId){
this.name = name;
this.imageId = imageId;
}
public String getName(){
return name;
}

public int getImageId() {
    return imageId;
}
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.fruit_item);
}

}
Fruit类中只有两个字段，name表示水果的名字，imageId表示水果对应图片的资源id.
然后需要为ListView的子项指定一个我们自定义的布局，在layout目录下新建fruit_item.xml，代码如下：

<?xml version="1.0" encoding="utf-8"?>

<ImageView
    android:id="@+id/fruit_image"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" />

<TextView
    android:id="@+id/fruit_name"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="center"
    android:layout_marginLeft="10dp"/>

在这个布局中，我们定义了一个ImageView用于显示水果的图片，又定义了一个TextView用于显示水果的名称。
接下来需要创建一个自定义的适配器，这个适配器继承自ArrayAdapter,并将泛型指定为Fruit类。新建类FruitAdapter，代码如下：
package com.android.uilayouttest;

import android.content.Context;
import android.text.Layout;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.TextView;

import java.util.List;

public class FruitAdapter extends ArrayAdapter {
private int resourceId;

public FruitAdapter(Context context, int textViewResourceId, List<Fruit> objects) {
    super(context,  textViewResourceId,objects);
    resourceId = textViewResourceId;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
    Fruit fruit = getItem(position);//获取当前项的Fruit实例
    View view = LayoutInflater.from(getContext()).inflate(resourceId,null);
    ImageView fruitImage = (ImageView) view.findViewById(R.id.fruit_image);
    TextView fruitName = (TextView) view.findViewById(R.id.fruit_name);
    fruitImage.setImageResource(fruit.getImageId());
    fruitName.setText(fruit.getName());
    return  view;
}

}
FruitAdapter重写了父类的一组构造，用于将上下文、ListView子项布局的id和数据都传递进来。另外又重写了getView()方法，这个方法在每个子项被滚动到屏幕内时被调用。在getView方法中，首先通过getItem()方法得到当前项的Fruit实例，然后使用LayoutInflater来为这个子项加载我们传入的布局，接着调用View的findViewById()方法分别获取到ImageView和TextView的实例，并分别调用他们的setImageResource()和setText()方法来设置显示的图片和文字，最后将布局返回，这样我们自定义的适配器就完成了。
下面修改MainActivity中的代码，如下所示：
package com.android.uilayouttest;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Window;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;

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

public class MainActivity extends AppCompatActivity {
private List fruitList = new ArrayList();
private String[] buttons = {“Apple”,“Banana”,“Orange”,“Watermelon”,“Pear”,“Grape”,“Pineapple”,“Cherry”,“Mango”,“Apple”,“Banana”,“Orange”,“Watermelon”,“Pear”,“Grape”,“Pineapple”,“Cherry”,“Mango”,“Apple”,“Banana”,“Orange”,“Watermelon”,“Pear”,“Grape”,“Pineapple”,“Cherry”,“Mango”};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.activity_main);
initFruits();//初始化水果数据
FruitAdapter adapter = new FruitAdapter(this,R.layout.fruit_item,fruitList);
// ArrayAdapter adapter1 = new ArrayAdapter(this, android.R.layout.simple_list_item_1,buttons);//借助ArrayAdapter实现数据传递
ListView listView = (ListView) findViewById(R.id.list_view);
listView.setAdapter(adapter);//调用setAdapter方法
}

private void initFruits() {
    Fruit apple = new Fruit("Apple",R.drawable.apple_pic);
    fruitList.add(apple);
    Fruit banana = new Fruit("Banana",R.drawable.banana_pic);
    fruitList.add(banana);
    Fruit orange = new Fruit("Orange",R.drawable.orange_pic);
    fruitList.add(orange);
    Fruit grape = new Fruit("Grape",R.drawable.grape_pic);
    fruitList.add(grape);
    Fruit pear = new Fruit("Pear",R.drawable.pear_pic);
    fruitList.add(pear);
    Fruit watermelon = new Fruit("Watermelon",R.drawable.watermelon_pic);
    fruitList.add(watermelon);
    Fruit cherry = new Fruit("Cherry",R.drawable.cherry_pic);
    fruitList.add(cherry);
    Fruit pineapple = new Fruit("Pineapple",R.drawable.pineapple_pic);
    fruitList.add(pineapple);
}

}