Android 实现下拉列表级联

.xml代码如下：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal" 
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<Spinner
android:id="@+id/city"
android:prompt="@string/city_prompt"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:entries="@array/city_lables"/>
<Spinner
android:id="@+id/area"
android:prompt="@string/city_prompt"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
</LinearLayout>

.java 代码如下：

package org.lxh.demo;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
public class MySpinnerListenerDemo extends Activity {
private Spinner city = null; // 下拉列表框内容
private Spinner area = null; // 二级列表
private String[][] areaData = new String[][] {
{ "东城", "西城", "朝阳", "大兴", "平谷" }, // 针对于一级的子信息
{ "黄浦", "杨浦", "闵行" }, // 针对于二级的子信息
{ "广州" } // 针对于三级的子信息
}; // 子菜单项
private ArrayAdapter<CharSequence> adapterArea = null;

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
super.setContentView(R.layout.main);
this.city = (Spinner) super.findViewById(R.id.city); // 取得下拉列表框
this.area = (Spinner) super.findViewById(R.id.area); // 取得下拉列表框
this.city.setOnItemSelectedListener(new OnItemSelectedListenerImpl());
}

private class OnItemSelectedListenerImpl implements OnItemSelectedListener {

public void onItemSelected(AdapterView<?> parent, View view,
int position, long id) { // 表示选项改变的时候触发
MySpinnerListenerDemo.this.adapterArea = new ArrayAdapter<CharSequence>(
MySpinnerListenerDemo.this,
android.R.layout.simple_spinner_item,
MySpinnerListenerDemo.this.areaData[position]); // 定义所有的列表项
MySpinnerListenerDemo.this.area
.setAdapter(MySpinnerListenerDemo.this.adapterArea);// 设置二级下拉列表的选项内容
}

public void onNothingSelected(AdapterView<?> arg0) { // 表示没有选项的时候触发
// 一般此方法现在不关心
}
}
}

效果如下：

源码下载：http://download.csdn.net/detail/yayun0516/8363843