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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