自定义下拉菜单

package com.city;

import java.io.InputStream;
import java.util.ArrayList;
import java.util.HashMap;

import org.json.JSONObject;

import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.widget.ArrayAdapter;

public class SwitchCity{
    private CityListActivity mContext;
    public SwitchCity(CityListActivity cox){
        this.mContext = cox;
    }
    
    public void onCreate(){
        
        AlertDialog.Builder builder = new AlertDialog.Builder(mContext);
        
        builder.setSingleChoiceItems(city,0,new OnClickListener() {
            
            @Override
            public void onClick(DialogInterface dialog, int which) {
                HashMap<String, String> requestParams = new HashMap<String, String>();
                requestParams.put("prov", which+1+"");
                System.out.println("postion=" + which);
                
                InputStream is = HttpUtil.doHttpGetRequest(requestParams, "http://zdevl.mapi.jjdd.com/nearby/lbs");
                ArrayList<JSONObject> nearbyList = JSONUtil.streamToJsonList(is);
                System.out.println("nearby-"+nearbyList);
                dialog.dismiss();
            }
        }).show();
    }
    
    
    public String city []= {"上海","北京","广东","浙江","江苏","四川","重庆","湖南","湖北","福建","广西","山东","河南","河北","辽宁","陕西","安徽","天津","江西","云南","黑龙江 ", "山西","吉林","贵州","海南","甘肃","青海","宁夏","内蒙古","新疆","西藏","香港","台湾","澳门","海外"};


    class LbsCityBaseAdapter extends ArrayAdapter<String>{
        public LbsCityBaseAdapter(Context context, int resource, String[] objects) {
            
            super(context, resource, objects);
            setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        }
        @Override
        public void setDropDownViewResource(int resource) {
            super.setDropDownViewResource(resource);
        }
    }
}