Android实现三级联动下拉框 下拉列表spinner

1.布局

<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_c

2.代码段

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}};@Overrideprotected 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@Overridepublic 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}@Overridepublic void onNothingSelected(AdapterView<?> arg0){}});//地级下拉监听citySpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener(){@Overridepublic 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);}@Overridepublic void onNothingSelected(AdapterView<?> arg0){}});}}