android 列表显示事件处理

 

在main.xml文件中代码如下：

 

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

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

  android:orientation="vertical" android:layout_width="fill_parent"

  android:layout_height="fill_parent">

  <TextView

     android:id="@+id/info"

     android:layout_width="fill_parent"

     android:layout_height="wrap_content"

     android:textSize="25px"

     android:gravity="center_horizontal"/>

  <ListView

     android:id="@+id/datalist"

     android:layout_width="fill_parent"

     android:layout_height="wrap_content"/>

</LinearLayout>

 

 

 

在layout文件夹中新建data_list.xml，代码如下：

 

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

<TableLayout

  xmlns:android="http://schemas.android.com/apk/res/android"

  android:layout_width="fill_parent"

  android:layout_height="wrap_content">

  <TableRow>

     <ImageView

       android:id="@+id/icon"

       android:layout_height="wrap_content"

       android:layout_width="wrap_content"

       android:src="@drawable/file_icon"/>

     <TextView

       android:id="@+id/_id"

       android:textSize="30px"

       android:gravity="center_vertical"

       android:layout_width="wrap_content"

       android:layout_height="wrap_content" />

     <TextView

       android:id="@+id/name"

       android:textSize="30px"

       android:gravity="center_vertical"

       android:layout_width="wrap_content"

       android:layout_height="wrap_content" />

  </TableRow>

</TableLayout>

 

 

在MyListViewDemo.java中代码如下：

 

package com.tarena.listviewproject;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

 

import android.app.Activity;

import android.os.Bundle;

import android.view.View;

import android.widget.AdapterView;

import android.widget.AdapterView.OnItemClickListener;

import android.widget.ListView;

import android.widget.SimpleAdapter;

import android.widget.TextView;

 

public class MyListViewDemo extends Activity {

  private String data[][] = {{"010","李叶文"},{"011","[email protected]"},{"012","广西省北海市银海区"},

       {"020","诸葛亮"},{"021","[email protected]"},{"022","南阳"},

       {"030","司马懿"},{"031","[email protected]"},{"032","许昌"},

       {"040","周瑜"},{"041","[email protected]"},{"042","江东"}}; // 准备出若干个信息而这些信息以后将通过程序加入到内嵌的线性布局文件之中

  private ListView datalist = null; // 定义ListView组件

  private List<Map<String, String>> list = new ArrayList<Map<String, String>>(); // 定义显示的内容包装

  private SimpleAdapter simpleAdapter = null; // 进行数据的转换操作

  private TextView info = null;

 

  @Override

  public void onCreate(Bundle savedInstanceState) {

     super.onCreate(savedInstanceState);

     super.setContentView(R.layout.main);

     this.datalist = (ListView) super.findViewById(R.id.datalist); // 取得组件

     this.info = (TextView) super.findViewById(R.id.info); // 取得组件

     for (int x = 0; x < this.data.length; x++) {

       Map<String, String> map = new HashMap<String, String>(); // 定义Map集合，保存每一行数据

       map.put("_id", this.data[x][0]); // 与data_list.xml中的TextView组加匹配

       map.put("name", this.data[x][1]); // 与data_list.xml中的TextView组加匹配

       this.list.add(map); // 保存了所有的数据行

     }

     this.simpleAdapter = new SimpleAdapter(this, this.list,

         R.layout.data_list, new String[] { "_id", "name" } // Map中的key的名称

         , new int[] { R.id._id, R.id.name }); // 是data_list.xml中定义的组件的资源ID

     this.datalist.setAdapter(this.simpleAdapter);

     this.datalist.setOnItemClickListener(new OnItemClickListenerImpl()); // 单击选项

  }

 

  private class OnItemClickListenerImpl implements OnItemClickListener {

 

     @SuppressWarnings("unchecked")

     public void onItemClick(AdapterView<?> parent, View view, int position,

         long id) {

       Map<String, String> map = (Map<String, String>) MyListViewDemo.this.simpleAdapter

            .getItem(position);

       String _id = map.get("_id");

       String name = map.get("name");

       MyListViewDemo.this.info.setText("选中的数据项ID是：" + _id + "，名称是："

            + name);

     }

  }

}