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;

    }

}