demo07

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

    <string-array name="city_labels">
        <item>中国－北京</item>
        <item>中国－上海</item>
        <item>中国－长沙</item>
    </string-array>

</resources>
============================
strings.xml
<?xml version="1.0" encoding="utf-8"?>
<resources>

    <string name="app_name" >Demo07CityArea
    </string>
    <string name="action_settings" >Settings
    </string>
    <string name="city_prompt" >你喜欢的城市：
    </string>
    <string name="area_prompt" >你喜欢的城区：
    </string>

</resources>
==============activity_main.xml===============
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="horizontal"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin"
    tools:context=".MainActivity">

    <!--prompt提示-->

    <Spinner
        android:id="@+id/city"
        android:prompt="@string/city_prompt"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:entries="@array/city_labels"
        />

    <Spinner
        android:id="@+id/area"
        android:prompt="@string/area_prompt"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>
</LinearLayout>

================================
package com.example.demo07cityarea;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Spinner;

public class MainActivity extends Activity {
    private Spinner city=null;
    private  Spinner area=null;

    private  String[][] areaData = new String[][]{
            {"朝阳","海淀"},{"黄埔"},{"岳麓","雨花"}

    };

    //下拉列表内容Adapter
    private ArrayAdapter<CharSequence> adapterArea=null;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        this.city=(Spinner)super.findViewById(R.id.city);
        this.area= (Spinner)super.findViewById(R.id.area);
        this.city.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
            @Override
            public void onItemSelected(AdapterView<?> adapterView, View view, int idx, long id) {//选项选中时触发
               //实例化列表项
                MainActivity.this.adapterArea= new ArrayAdapter<CharSequence>(MainActivity.this,android.R.layout.select_dialog_item,MainActivity.this.areaData[idx]);
               //设置列表显示风格
                MainActivity.this.adapterArea.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
               //设置数据
                MainActivity.this.area.setAdapter(MainActivity.this.adapterArea);
            }

            @Override
            public void onNothingSelected(AdapterView<?> adapterView) {

            }
        });
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

}