ListView讲解

比眉伴天荒 2022-10-01 03:53 143阅读 0赞

ListView是比较常用的控件，但一直都觉得创建ListView步骤有点繁琐，故在此总结一下，方便查阅。

程序效果是实现一个ListView,ListView里面有标题，内容和图片，并加入点击和长按响应。

首先在xml里面定义一个ListView  
  
Xml代码

<?xml version="1.0" encoding="utf-8"?>  
<LinearLayout  
android:id="@+id/LinearLayout01"  
android:layout\_width="fill\_parent"  
android:layout\_height="fill\_parent"  
xmlns:android="http://schemas.android.com/apk/res/android">  
<ListView android:layout\_width="wrap\_content"  
android:layout\_height="wrap\_content"  
android:id="@+id/ListView01"  
/>  
</LinearLayout>

定义ListView每个条目的Layout，用RelativeLayout实现：

Xml代码

<?xml version="1.0" encoding="utf-8"?>  
<RelativeLayout  
android:id="@+id/RelativeLayout01"  
android:layout\_width="fill\_parent"  
xmlns:android="http://schemas.android.com/apk/res/android"  
android:layout\_height="wrap\_content"  
android:paddingBottom="4dip"  
android:paddingLeft="12dip"  
android:paddingRight="12dip">  
<ImageView  
android:paddingTop="12dip"  
android:layout\_alignParentRight="true"  
android:layout\_width="wrap\_content"  
android:layout\_height="wrap\_content"  
android:id="@+id/ItemImage"  
/>  
<TextView  
android:text="TextView01"  
android:layout\_height="wrap\_content"  
android:textSize="20dip"  
android:layout\_width="fill\_parent"  
android:id="@+id/ItemTitle"  
/>  
<TextView  
android:text="TextView02"  
android:layout\_height="wrap\_content"  
android:layout\_width="fill\_parent"  
android:layout\_below="@+id/ItemTitle"  
android:id="@+id/ItemText"  
/>  
</RelativeLayout>

最后在Activity里面调用和加入Listener,具体见注释：

package com.ray.test;  
  
import java.util.ArrayList;  
import java.util.HashMap;  
  
import android.app.Activity;  
import android.os.Bundle;  
import android.view.ContextMenu;  
import android.view.MenuItem;  
import android.view.View;  
import android.view.ContextMenu.ContextMenuInfo;  
import android.view.View.OnCreateContextMenuListener;  
import android.widget.AdapterView;  
import android.widget.ListView;  
import android.widget.SimpleAdapter;  
import android.widget.AdapterView.OnItemClickListener;  
  
public class TestListView extends Activity \{  
@Override  
public void onCreate(Bundle savedInstanceState) \{  
super.onCreate(savedInstanceState);  
setContentView(R.layout.main);  
//绑定Layout里面的ListView  
ListView list = (ListView) findViewById(R.id.ListView01);  
  
//生成动态数组，加入数据  
ArrayList<HashMap<String, Object>> listItem = new ArrayList<HashMap<String, Object>>();  
for(int i=0;i<10;i++)  
\{  
HashMap<String, Object> map = new HashMap<String, Object>();  
map.put("ItemImage", R.drawable.checked);//图像资源的ID  
map.put("ItemTitle", "Level "+i);  
map.put("ItemText", "Finished in 1 Min 54 Secs, 70 Moves! ");  
listItem.add(map);  
\}  
//生成适配器的Item和动态数组对应的元素  
SimpleAdapter listItemAdapter = new SimpleAdapter(this,listItem,//数据源  
R.layout.list\_items,//ListItem的XML实现  
//动态数组与ImageItem对应的子项  
new String\[\] \{"ItemImage","ItemTitle", "ItemText"\},  
//ImageItem的XML文件里面的一个ImageView,两个TextView ID  
new int\[\] \{R.id.ItemImage,R.id.ItemTitle,R.id.ItemText\}  
);  
  
//添加并且显示  
list.setAdapter(listItemAdapter);  
  
//添加点击  
list.setOnItemClickListener(new OnItemClickListener() \{  
  
@Override  
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,  
long arg3) \{  
setTitle("点击第"+arg2+"个项目");  
\}  
\});  
  
//添加长按点击  
list.setOnCreateContextMenuListener(new OnCreateContextMenuListener() \{  
  
@Override  
public void onCreateContextMenu(ContextMenu menu, View v,ContextMenuInfo menuInfo) \{  
menu.setHeaderTitle("长按菜单-ContextMenu");  
menu.add(0, 0, 0, "弹出长按菜单0");  
menu.add(0, 1, 0, "弹出长按菜单1");  
\}  
\});  
\}  
  
//长按菜单响应函数  
@Override  
public boolean onContextItemSelected(MenuItem item) \{  
setTitle("点击了长按菜单里面的第"+item.getItemId()+"个项目");  
return super.onContextItemSelected(item);  
\}  
\}