Android開發實現二級聯動下拉列表

　　代碼如下：

　　Java code:

　　package zye.client.Client;

　　import android.app.Activity;
　　import android.content.Context;
　　import android.os.Bundle;
　　import android.view.View;
　　import android.widget.AdapterView;
　　import android.widget.ArrayAdapter; import android.widget.Spinner;
　　import android.widget.AdapterView.OnItemSelectedListener;

　　public class cityset extends Activity{
　　    private String[] province = new String[] {"直轄市", "特別行政區","黑龍江"};
　　    private String[] city = new String[]{"北京","上海","天津","重慶"};
　　    private String[][] pandc = new String[][]{{"北京","上海","天津","重慶"},{"香港","澳

　　門"},{"哈爾濱","齊齊哈爾","牡丹江","大慶","伊春","雙鴨山","鶴崗","雞西","佳木斯","七台河","黑河","綏化","大興安嶺"}};
    　　private Spinner sp;
    　　private Spinner sp2;
    　　private Context context;

    　　ArrayAdapter<String> adapter ;

    　　ArrayAdapter<String> adapter2;
   
    　　 public void onCreate(Bundle savedInstanceState) {
    　　     super.onCreate(savedInstanceState);
    　　     setContentView(R.layout.cityset);

　　context = this;
        
        　　    adapter = new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item, province);
            　　adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
            　　sp = (Spinner) findViewById(R.id.province);
            　　sp.setAdapter(adapter);
            　　sp.setOnItemSelectedListener(selectListener);
            
            　　adapter2 = new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item, city);
            adapter2.setDropDownViewResource

　　(android.R.layout.simple_spinner_dropdown_item);
　　            sp2 = (Spinner) findViewById(R.id.city);
　　            sp2.setAdapter(adapter2);
           
　　    }
    
　　     private OnItemSelectedListener selectListener = new OnItemSelectedListener(){
　　         public void onItemSelected(AdapterView parent, View v, int position,long id){
　　             int pos = sp.getSelectedItemPosition();
　　             adapter2 = new ArrayAdapter<String>

　　(context,android.R.layout.simple_spinner_item, pandc[pos]);
　　             sp2.setAdapter(adapter2);
　　         }
      
　　         public void onNothingSelected(AdapterView arg0){

         }

     };

}

　　xml code:

　　<?xml version="1.0" encoding="utf-8"?>
　　<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
　　    android:layout_width="fill_parent"
　　    android:layout_height="fill_parent"
　　    android:background="#FFFFFF"
　　    >
　　    <Spinner android:id="@+id/province"
　　        android:layout_width="fill_parent"
　　          android:layout_height="45px"
　　          android:layout_marginLeft="75px"
　　          android:layout_marginRight="20px"
　　        android:layout_marginTop="7px"
　　         android:drawSelectorOnTop="true"
　　         android:layout_alignParentRight="true"
　　    />
　　       <Spinner android:id="@+id/city"
　　        android:layout_width="fill_parent"
    　　      android:layout_height="45px"
    　　      android:layout_marginLeft="75px"
    　　      android:layout_marginRight="20px"
    　　    android:layout_marginTop="3px"
    　　     android:drawSelectorOnTop="true"
    　　     android:layout_alignParentRight="true"
    　　     android:layout_below="@id/province"
    　     />
     
　　</RelativeLayout>