多层级Spinner列表选项实时更新树形层级(选择城市)

package com.example.spinnerdemo;

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

public class MainActivity extends Activity {

private Spinner provinceSpinner = null; // 省（省、直辖市）
private Spinner citySpinner = null; // 市
private Spinner countrySpinner = null; // 区

private ArrayAdapter<String> provinceAdapter = null; // 省
private ArrayAdapter<String> cityAdapter = null; // 市
private ArrayAdapter<String> countryAdapter = null; // 区

private int provincePosition = 3;

// 省级选项值
private String[] province = new String[] { "北京", "上海", "天津", "广东" };// ,"重庆","黑龙江","江苏","山东","浙江","香港","澳门"};

// 市级选项值
private String[][] city = new String[][] {
{ "东城区", "西城区", "崇文区", "宣武区", "朝阳区", "海淀区", "丰台区", "石景山区", "门头沟区","房山区", "通州区", "顺义区", "大兴区", "昌平区", "平谷区", "怀柔区", "密云县","延庆县" },
{ "长宁区", "静安区", "普陀区", "闸北区", "虹口区" },
{ "和平区", "河东区", "河西区", "南开区", "河北区", "红桥区", "塘沽区", "汉沽区", "大港区","东丽区" },
{ "广州", "深圳", "韶关" // ,"珠海","汕头","佛山","湛江","肇庆","江门","茂名","惠州","梅州",
// "汕尾","河源","阳江","清远","东莞","中山","潮州","揭阳","云浮"
} };

// 区县级选项值
private String[][][] country = new String[][][]
{
{   //北京
{"无"},{"无"},{"无"},{"无"},{"无"},{"无"},{"无"},{"无"},{"无"},{"无"},
{"无"},{"无"},{"无"},{"无"},{"无"},{"无"},{"无"},{"无"}
},
{    //上海
{"无"},{"无"},{"无"},{"无"},{"无"}
},
{    //天津
{"无"},{"无"},{"无"},{"无"},{"无"},{"无"},{"无"},{"无"},{"无"},{"无"}
},
{    //广东
{"海珠区","荔湾区","越秀区","白云区","萝岗区","天河区","黄埔区","花都区","从化市","增城市","番禺区","南沙区"}, //广州
{"宝安区","福田区","龙岗区","罗湖区","南山区","盐田区"}, //深圳
{"武江区","浈江区","曲江区","乐昌市","南雄市","始兴县","仁化县","翁源县","新丰县","乳源县"}  //韶关
}
};

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

provinceSpinner = (Spinner) findViewById(R.id.spinner_province);
citySpinner = (Spinner) findViewById(R.id.spinner_city);
countrySpinner = (Spinner) findViewById(R.id.spinner_country);

// 装载适配器和值
provinceAdapter = new ArrayAdapter<String>(this,
android.R.layout.simple_spinner_item, province);
provinceSpinner.setAdapter(provinceAdapter);

cityAdapter = new ArrayAdapter<String>(this,
android.R.layout.simple_spinner_item, city[3]);
citySpinner.setAdapter(cityAdapter);

countryAdapter = new ArrayAdapter<String>(this,
android.R.layout.simple_spinner_item, country[3][0]);
countrySpinner.setAdapter(countryAdapter);

// 省下拉框监听
provinceSpinner
.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {

@Override
public void onItemSelected(AdapterView<?> arg0, View arg1,
int position, long arg3) {

cityAdapter = new ArrayAdapter<String>(
getApplication(),
android.R.layout.simple_spinner_item,
city[position]);
citySpinner.setAdapter(cityAdapter);

provincePosition = position; // 记录当前省级序号，留给下面修改县级适配器时用
}

@Override
public void onNothingSelected(AdapterView<?> arg0) {

}

});

// 市级下拉监听
citySpinner
.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {

@Override
public void onItemSelected(AdapterView<?> arg0, View arg1,
int position, long arg3) {
countryAdapter = new ArrayAdapter<String>(
getApplication(),
android.R.layout.simple_spinner_item,
country[provincePosition][position]);
countrySpinner.setAdapter(countryAdapter);
}

@Override
public void onNothingSelected(AdapterView<?> arg0) {

}
});
}
}

<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:background="#e0e0e0"
android:orientation="horizontal" >
<Spinner
android:id="@+id/spinner_province"
android:layout_width="0dip"
android:layout_weight="1"
android:layout_height="wrap_content" />

<Spinner
android:id="@+id/spinner_city"
android:layout_width="0dip"
android:layout_weight="1"
android:layout_height="wrap_content" />

<Spinner
android:id="@+id/spinner_country"
android:layout_width="0dip"
android:layout_weight="1"
android:layout_height="wrap_content" />
</LinearLayout>