Android ListView

ListView是比较常用的控件。

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 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>

<?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 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>

<?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);
    }
}