如何使用Spinner实现省市的二级联动功能

1.确定我需要的数据放到res/values/arrays.xml文件(定义数组)

<?xml version="1.0" encoding="utf-8"?>
<resources>
  <string-array name="province">
        <item>-省份-</item>
  <item>河北省</item>
  <item>山西省</item>    
  <item>北京市</item> 
  </string-array>
  <string-array name="hb">
        <item>-城市-</item>
  <item>承德市</item>
  <item>邯郸市</item>    
  <item>廊坊市</item> 
  </string-array>
   <string-array name="bj">
         <item>-城市-</item>
  <item>海淀区</item>
  <item>朝阳区</item>    
  <item>崇文区</item> 
</string-array>
<string-array name="shx">
     <item>-城市-</item>
  <item>大同市</item>
  <item>临汾市</item>
</string-array>
</resources>

2.编写xml界面res/values/main.xml文件(编写界面)

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
  <TextView 
      android:layout_width="fill_parent"
      android:layout_height="wrap_content"
      android:id="@+id/textView"
      />
<RelativeLayout
     android:layout_width="fill_parent"
     android:layout_height="wrap_content"
     >    
  <Spinner
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:id="@+id/province"
      />
       <Spinner
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_toRightOf="@id/province"
      android:id="@+id/city"
      />
       </RelativeLayout>
</LinearLayout>

3.在Activity中实现省市联动功能

/**
* 通过Spinner实现省市(两级)联动
* @author 黑色天空
*/
public class MainActivity extends Activity {
private TextView textView ;
private Spinner province;
private Spinner city;
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
       
        //String[] provinces = new String[]{"-省份-","河北省","山西省","北京"};
        textView = (TextView)this.findViewById(R.id.textView);
        province = (Spinner)this.findViewById(R.id.province);
        city = (Spinner)this.findViewById(R.id.city);
       

        //(处理省的显示)
        //将可选内容与ArrayAdapter的连接(从资源数组文件中获取数据)
        ArrayAdapter<CharSequence> adapter =
             ArrayAdapter.createFromResource(this, R.array.province, android.R.layout.simple_spinner_item);
         //new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item, provinces);
        //设置下拉列表的风格
        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
       
        //将数据绑定到Spinner视图上
        province.setAdapter(adapter);
       
        //添加条目被选中监听器
        province.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
           
   @Override
   public void onItemSelected(AdapterView<?> parent, View view,int position, long id) {
    //parent既是province对象
    Spinner spinner = (Spinner)parent;
    String pro =  (String)spinner.getItemAtPosition(position);

    //(处理省的市的显示)
    //将默认值与ArrayAdapter连接(从资源数组文件中获取数据)
    ArrayAdapter<CharSequence> cityAdapter = ArrayAdapter.createFromResource
                   (MainActivity.this, R.array.citydefault, android.R.layout.simple_spinner_item);
     //new  ArrayAdapter<CharSequence>
          //           (MainActivity.this,android.R.layout.simple_spinner_item, cities);
    //获取所在省含有哪些市(从资源数组文件中获取数据)
    if(pro.equals("河北省")){
    
     cityAdapter = ArrayAdapter.createFromResource
                (MainActivity.this, R.array.hb, android.R.layout.simple_spinner_item);
    }else if(pro.equals("北京市")){
    
     cityAdapter = ArrayAdapter.createFromResource
                (MainActivity.this, R.array.bj, android.R.layout.simple_spinner_item);
    }else if(pro.equals("山西省")){
    
     cityAdapter = ArrayAdapter.createFromResource
                (MainActivity.this, R.array.shx, android.R.layout.simple_spinner_item);
    }
    //绑定数据到Spinner(City)上
    city.setAdapter(cityAdapter);
   }

   @Override
   public void onNothingSelected(AdapterView<?> parent) {
   
   }
      
        });
    }
}

 

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