android省市二级联动

① 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) {

}

});
}
}

② android如何动态更新二级联动spinner

spinner有一个setSelection（），将spinner设为全局变量后用spinner.setSelection(GestureConstant.FILE_GESTURE, false);就可以了。
贴一部分代码，不完整。
Activity
[java] view plain
Intent fileIntent = new Intent(FileManager.this,
CreateGestureActivity.class);
fileIntent.putExtra("file", "file");
startActivity(fileIntent);