Android实现省市区三级联动

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  xmlns:tools="http://schemas.android.com/tools"  android:id="@+id/activity_main"  android:layout_width="match_parent"  android:layout_height="match_parent"  tools:context="com.example.testspinnerprovince.MainActivity"  android:orientation="vertical">  <TextView    android:layout_width="match_parent"    android:layout_height="wrap_content"    android:textSize="20sp"    android:text="@string/selection"    android:padding="6dp"/>  <LinearLayout    android:layout_width="match_parent"    android:layout_height="wrap_content"    android:layout_marginTop="30dp"    android:orientation="horizontal">    <Spinner      android:id="@+id/provinceSpinner"      android:layout_width="wrap_content"      android:layout_height="wrap_content"      android:layout_weight="1"/>    <Spinner      android:id="@+id/citySpinner"      android:layout_width="wrap_content"      android:layout_height="wrap_content"      android:layout_weight="1"/>    <Spinner      android:id="@+id/countySpinner"      android:layout_width="wrap_content"      android:layout_height="wrap_content"      android:layout_weight="1"/>  </LinearLayout>  <TextView    android:id="@+id/show"    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:textSize="20sp"    android:padding="6dp"    android:layout_marginTop="80dp"    android:text="@string/selected"/></LinearLayout>

public class MainActivity extends AppCompatActivity {  private TextView show;  private Spinner provinceSpinner;//省级  private Spinner citySpinner;//市级  private Spinner countySpinner;//区级  private String[] province = new String[]{"北京","上海","天津","广东"};  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"}};  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","黄浦区","花都区","从化市","增城市"          ,"番禺区","南沙区"},      {"宝安区","福田区","龙岗区","罗湖区","南山区","盐田区"},      {"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"}  }  };  //Spinner想要填充肯定需要适配器  private ArrayAdapter<String> provinceAdapter;  private ArrayAdapter<String> cityAdapter;  private ArrayAdapter<String> countyAdapter;  private int provicePosition;//省级选中索引  private int cityPosition;//市级选中索引  @Override  protected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_main);    initViews();//初始化  }  //控件初始化  private void initViews() {    provinceSpinner = (Spinner) findViewById(R.id.provinceSpinner);    citySpinner = (Spinner) findViewById(R.id.citySpinner);    countySpinner = (Spinner) findViewById(R.id.countySpinner);    show = (TextView) findViewById(R.id.show);    //初始化适配器及显示的内容    provinceAdapter = new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item,province);    provinceSpinner.setAdapter(provinceAdapter);    //对省级下拉实现监听，市级下拉需要根据不同的省级显示不同内容。    provinceSpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {      @Override      public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {        //需要在item选中省级的时候，动态的改变市级对应的显示        cityAdapter = new ArrayAdapter<String>(MainActivity.this,android.R.layout.simple_spinner_item,city[position]);        //设置二级下拉列表当中选项内容适配器        citySpinner.setAdapter(cityAdapter);        //记录当前的省级索引位置，留给下面修改县级进行适配使用        provicePosition = position;      }      @Override      public void onNothingSelected(AdapterView<?> parent) {      }    });    //市级下拉监听    citySpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {      @Override      public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {        //需要在item选中市级的时候，动态的改变县级对应的显示        countyAdapter = new ArrayAdapter<String>(MainActivity.this,android.R.layout.simple_spinner_item,county[provicePosition][position]);//首先确定是哪个省的。        //设置二级下拉列表当中选项内容适配器        countySpinner.setAdapter(countyAdapter);        show.setText("选中的城市为:"+ province[provicePosition] + city[provicePosition][position]);        cityPosition = position;      }      @Override      public void onNothingSelected(AdapterView<?> parent) {      }    });    //区级的下拉    countySpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {      @Override      public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {        show.setText("选中的城市为:"+ province[provicePosition] + city[provicePosition][cityPosition]            + county[provicePosition][cityPosition][position]);      }      @Override      public void onNothingSelected(AdapterView<?> parent) {      }    });  }}