Android实现多层级Spinner列表选项实时更新树形层级

package com.example.spinneradapter;    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>