<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="wrap_content"     android:orientation="horizontal"     android:padding="8dp" >     <Spinner         android:id="@+id/spin_province"         android:layout_width="80dp"         android:layout_height="wrap_content" />     <Spinner         android:id="@+id/spin_city"         android:layout_width="112dp"         android:layout_height="wrap_content" />     <Spinner         android:id="@+id/spin_county"         android:layout_width="100dp"         android:layout_height="wrap_content" /> </LinearLayout>

package com.example.android.demo.spinner; 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;  //省级（省、直辖市）     private Spinner citySpinner = null;     //地级市     private Spinner countySpinner = null;    //县级（区、县、县级市）     ArrayAdapter<String> provinceAdapter = null;  //省级适配器     ArrayAdapter<String> cityAdapter = null;    //地级适配器     ArrayAdapter<String> countyAdapter = null;    //县级适配器     static 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"};     //地级选项值     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"                     }             };     //县级选项值     private String[][][] county = 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);         setSpinner();     }         /*      * 设置下拉框      */     private void setSpinner()     {                provinceSpinner = (Spinner)findViewById(R.id.spin_province);         citySpinner = (Spinner)findViewById(R.id.spin_city);         countySpinner = (Spinner)findViewById(R.id.spin_county);         //绑定适配器和值         provinceAdapter = new ArrayAdapter<String>(MainActivity.this,                 android.R.layout.simple_spinner_item, province);         provinceSpinner.setAdapter(provinceAdapter);         provinceSpinner.setSelection(3,true);  //设置默认选中项，此处为默认选中第4个值         cityAdapter = new ArrayAdapter<String>(MainActivity.this,                 android.R.layout.simple_spinner_item, city[3]);         citySpinner.setAdapter(cityAdapter);         citySpinner.setSelection(0,true);  //默认选中第0个         countyAdapter = new ArrayAdapter<String>(MainActivity.this,                 android.R.layout.simple_spinner_item, county[3][0]);         countySpinner.setAdapter(countyAdapter);         countySpinner.setSelection(0, true);                 //省级下拉框监听         provinceSpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener()         {             // 表示选项被改变的时候触发此方法，主要实现办法：动态改变地级适配器的绑定值             @Override             public void onItemSelected(AdapterView<?> arg0, View arg1, int position, long arg3)             {                 //position为当前省级选中的值的序号                 //将地级适配器的值改变为city[position]中的值                 cityAdapter = new ArrayAdapter<String>(                         MainActivity.this, android.R.layout.simple_spinner_item, city[position]);                 // 设置二级下拉列表的选项内容适配器                 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)             {             }         });                 //地级下拉监听         citySpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener()         {             @Override             public void onItemSelected(AdapterView<?> arg0, View arg1,                     int position, long arg3)             {                 countyAdapter = new ArrayAdapter<String>(MainActivity.this,                         android.R.layout.simple_spinner_item, county[provincePosition][position]);                 countySpinner.setAdapter(countyAdapter);             }             @Override             public void onNothingSelected(AdapterView<?> arg0)             {             }         });     } }