Android-ListView

ListView常用属性:
android:cacheColorHint="#00000000"//设置拖动背景色为透明

android:dividerHeight=“30px”//listview item之间的高度

android:divider="@drawable/ic_launcher"//listview item之间的背景或者说是颜色

android:fadingEdge=“vertical”//上边和下边有黑色的阴影 值为none的话就没有阴影

android:scrollbars=“horizontal|none”//只有值为horizontal|vertical的时候，才会显示滚动条，并且会自动影藏和显示

android:fastScrollEnabled=“true”//快速滚动效果，配置这个属性，在快速滚动的时候旁边会出现一个小方块的快速滚动效果，自动隐藏和显示

android:divider="@drawable/song_item_line" item之间的分割线

定制ListView界面

1.定义一个实体类Fruit

package cn.edu.bu.a13lab07;

public class Fruit {
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;
}

}

2.为 ListView 的子项指定一个我们自定义的布局

fruit_item.xml

<?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=“match_parent”>

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

3、创建一个自定义的适配器 FruitAdapter，这个适配器

继承自 ArrayAdapter。重写构造方法和 getView 方法。

package cn.edu.bu.a13lab07;

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;

import java.util.List;

public class FruitAdapter extends ArrayAdapter{
private final int resourceId;

public FruitAdapter(Context context, int 

textViewResourceId, List objects) {
super(context, textViewResourceId,

objects);
resourceId = textViewResourceId;
}
@Override
public View getView(int position, View

convertView, ViewGroup parent) {
Fruit fruit = (Fruit) getItem(position);

// 获取当前项的Fruit实例
View view = LayoutInflater.from

(getContext()).inflate(resourceId, null);//实例化

一个对象
ImageView fruitImage = (ImageView)

view.findViewById(R.id.fruit_image);//获取该布局内

的图片视图
TextView fruitName = (TextView)

view.findViewById(R.id.fruit_name);//获取该布局内

的文本视图
fruitImage.setImageResource

(fruit.getImageId());//为图片视图设置图片资源
fruitName.setText(fruit.getName());//为文

本视图设置文本内容
return view;
}
}

View view = LayoutInflater.from(getContext

()).inflate(resourceId, null);使用Inflater对象来将

布局文件解析成一个View

4、在MainActivity中编写，初始化水果数据

package cn.edu.bu.a13lab07;

import android.app.Activity;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.ListView;

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

public class MainActivity extends Activity {
private List fruitList = new

ArrayList();

@Override
protected void onCreate(Bundle 

savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initFruits(); // 初始化水果数据
FruitAdapter adapter = new FruitAdapter

(MainActivity.this, R.layout.fruit_item,

fruitList);
ListView listView = (ListView)

findViewById(R.id.list_view);
listView.setAdapter(adapter);
}

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 watermelon = new Fruit(“Watermelon”,

R.drawable.watermelon_pic);
fruitList.add(watermelon);
Fruit pear = new Fruit(“Pear”,

R.drawable.pear_pic);
fruitList.add(pear);
Fruit grape = new Fruit(“Grape”,

R.drawable.grape_pic);
fruitList.add(grape);
Fruit pineapple = new Fruit(“Pineapple”,

R.drawable.pineapple_pic);
fruitList.add(pineapple);
Fruit strawberry = new Fruit(“Strawberry”,

R.drawable.strawberry_pic);
fruitList.add(strawberry);
Fruit cherry = new Fruit(“Cherry”,

R.drawable.cherry_pic);
fruitList.add(cherry);
Fruit mango = new Fruit(“Mango”,

R.drawable.mango_pic);
fruitList.add(mango);
}
}