Android开发实现二级联动下拉列表

　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[] {"直辖市", "特别行政区","黑龙江"};
　　    private String[] city = new String[]{"北京","上海","天津","重庆"};
　　    private String[][] pandc = new String[][]{{"北京","上海","天津","重庆"},{"香港","澳

　　门"},{"哈尔滨","齐齐哈尔","牡丹江","大庆","伊春","双鸭山","鹤岗","鸡西","佳木斯","七台河","黑河","绥化","大兴安岭"}};
    　　private Spinner sp;
    　　private Spinner sp2;
    　　private Context context;

    　　ArrayAdapter adapter ;

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

　　context = this;
         
        　　    adapter = new ArrayAdapter(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(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

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

         }

     };

}

　　xml code: