android中的spinner动态加载内容

android中的spinner动态加载数据：

GroupPurchase.java

package jftt.txlong;

import java.util.ArrayList;
import java.util.List;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Spinner;
import android.widget.TextView;

public class GroupPurchase extends Activity {
	private Spinner changeCity;
	private Button refresh, pre, next;
	private TextView leftTime, detail, price, citygp;
	private ImageView images;
	private ArrayAdapter<String> adapter;
	private List<String> allItems;
	private String[] citys = { "北京市", "上海市", "天津市", "福州市" };

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		initView();
		
		allItems = new ArrayList<String>();
		for (int i = 0; i < citys.length; i++) {
			allItems.add(citys[i]);
		}
		adapter = new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item, allItems);
		adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
		changeCity.setAdapter(adapter);
		changeCity.setOnItemSelectedListener(new Spinner.OnItemSelectedListener() {
					@Override
					public void onItemSelected(AdapterView<?> arg0, View arg1,
							int arg2, long arg3) {
						citygp.setText(changeCity.getSelectedItem().toString() + "今天的团购");
						Log.i("info-----------", changeCity.getSelectedItem().toString());
					}

					@Override
					public void onNothingSelected(AdapterView<?> arg0) {
					}
				});

		pre.setOnClickListener(new View.OnClickListener() {
			@Override
			public void onClick(View v) {
				Log.i("info-----------", "prefer button has pressed!!!");
			}
		});

		next.setOnClickListener(new View.OnClickListener() {
			@Override
			public void onClick(View v) {
				Log.i("info-----------", "next button has pressed!!!");
			}
		});
	}

	private void initView() {
		changeCity = (Spinner) findViewById(R.id.changeCity);
		citygp = (TextView)findViewById(R.id.citygp);
		refresh = (Button) findViewById(R.id.refresh);
		pre = (Button) findViewById(R.id.pre);
		next = (Button) findViewById(R.id.next);
		leftTime = (TextView) findViewById(R.id.lefttime);
		detail = (TextView) findViewById(R.id.detail);
		images = (ImageView) findViewById(R.id.images);
		price = (TextView) findViewById(R.id.price);
	}
}

 main.xml

<?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">
	
	<RelativeLayout android:layout_width="fill_parent"
		android:layout_height="wrap_content">
		<Spinner android:id="@+id/changeCity" 
			android:layout_width="wrap_content"
			android:layout_height="wrap_content" 
			android:layout_alignParentLeft="true"/>
		<TextView android:text="郑州今日团购" 
			android:id="@+id/citygp"
			android:layout_width="wrap_content" 
			android:layout_height="wrap_content"
			android:layout_toLeftOf="@+id/refresh"/>
		<Button android:text="刷新"
			android:id="@+id/refresh"
			android:layout_width="wrap_content" 
			android:layout_height="wrap_content" 
			android:layout_alignParentRight="true"/>
	</RelativeLayout>
	
	<RelativeLayout android:layout_width="fill_parent"
		android:layout_height="wrap_content">
		<TextView android:text="剩余时间：" 
			android:layout_width="wrap_content" 
			android:layout_height="wrap_content" 
			android:layout_alignParentLeft="true"/>
		<TextView android:id="@+id/lefttime" 
			android:layout_width="wrap_content" 
			android:layout_height="wrap_content" 
			android:layout_alignParentTop="true" 
			android:layout_centerHorizontal="true"/>
		<Button android:text="订购" 
			android:id="@+id/order"
			android:layout_width="wrap_content" 
			android:layout_height="wrap_content" 
			android:layout_alignParentRight="true"/>
	</RelativeLayout>
	
	<TextView android:id="@+id/detail"
		android:layout_width="fill_parent"
		android:layout_height="wrap_content"/>
	<LinearLayout android:layout_width="fill_parent"
		android:layout_height="wrap_content">
		<ImageView android:id="@+id/images"
			android:layout_width="wrap_content"
			android:layout_height="wrap_content"/>
		<TextView android:id="@+id/price"
			android:layout_width="wrap_content"
			android:layout_height="wrap_content"/>
	</LinearLayout>
	
	<RelativeLayout android:layout_width="fill_parent"
		android:layout_height="wrap_content">
		<Button android:id="@+id/pre"
			android:text="上一个"
			android:layout_width="wrap_content"
			android:layout_height="wrap_content"
			android:layout_alignParentLeft="true"/>
		<Button android:id="@+id/next"
			android:text="下一个"
			android:layout_width="wrap_content"
			android:layout_height="wrap_content"
			android:layout_alignParentRight="true"/>
	</RelativeLayout>
	
</LinearLayout>