package com.melhc.util;import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
public class HttpUtil {/** 从服务器端获取省县市的数据*/public static void sendHttpRequest(final String address,final HttpCallbackListener listener) {new Thread(new Runnable() {@Overridepublic void run() {// TODO Auto-generated method stubHttpURLConnection connection = null;try {//创建一个url对象URL url = new URL(address);//通过url对象获取HTTPURLCONNCETION实例connection = (HttpURLConnection) url.openConnection();//设置http的请求所使用的方法为get方法connection.setRequestMethod("GET");//自由定制一些属性，比如设置连接超时，读取超时的毫秒数connection.setConnectTimeout(8000);connection.setReadTimeout(8000);//获得服务器返回的输入流InputStream in = connection.getInputStream();//将得到的输入流装换成String字符串BufferedReader reader = new BufferedReader(new InputStreamReader(in, "utf-8"));StringBuffer response = new StringBuffer();String line;while ((line = reader.readLine()) != null) {response.append(line);}LogUtil.i("HTTPUtil","------------------>" + response.toString());if (listener != null) {listener.onFinish(response.toString());}} catch (Exception e) {// TODO: handle exceptionif (listener != null) {listener.onError(e);}} finally {if (connection != null) {connection.disconnect();}}}}).start();}
}

package com.melhc.util;/**  网路连接的回掉接口*/
public interface HttpCallbackListener {void onFinish(String response);void onError(Exception e);
}

HttpUtil.sendHttpRequest(address, new HttpCallbackListener() {@Overridepublic void onFinish(String response) {// TODO Auto-generated method stubboolean result = false;if ("province".equals(type)) {result = Utility.handleProvicesResponse(weatherDB, response);} else if ("city".equals(type)) {result = Utility.handleCitiesResponse(weatherDB, response,selectedProvince);} else if ("county".equals(type)) {result = Utility.handleCountiesResponse(weatherDB,response, selectedCity);}

三、Volley实现网络通信

接下来我们就开始正式使用Volley完成上面一摸一样的通信流程,只需要三步即可完成网络的发送与响应！首先还是得先下载一下Volley的jar文件，并且导入自己的程序中！volley.jar下载地址：http://download.csdn.net/detail/u013900875/8279223。接下来按以下三步走即可！

1. 创建一个RequestQueue对象。

2. 创建一个StringRequest对象。

3. 将StringRequest对象添加到RequestQueue里面。

具体的代码实现如下所示

RequestQueue mQueue = Volley.newRequestQueue(getApplicationContext());StringRequest stringRequest = new StringRequest(address,new Response.Listener<String>() {@Overridepublic void onResponse(String response) {LogUtil.i("TAG", "---------------->"+response);boolean result = false;if ("province".equals(type)) {result = Utility.handleProvicesResponse(weatherDB,response);} else if ("city".equals(type)) {result = Utility.handleCitiesResponse(weatherDB,response, selectedProvince);} else if ("county".equals(type)) {result = Utility.handleCountiesResponse(weatherDB,response, selectedCity);}if (result) {// 通过runonUiMainThread方法返回主线程处理逻辑runOnUiThread(new Runnable() {@Overridepublic void run() {// TODO Auto-generated method stubcloseProgressDialog();if ("province".equals(type)) {queryProvinces();} else if ("city".equals(type)) {queryCities();} else if ("county".equals(type)) {queryCounties();}}});}}}, new Response.ErrorListener() {@Overridepublic void onErrorResponse(VolleyError error) {LogUtil.i("TAG", "-------------------->" + error);runOnUiThread(new Runnable() {@Overridepublic void run() { // TODO Auto-generated method// stub //closeProgressDialog();Toast.makeText(getApplicationContext(),"加载数据失败！", Toast.LENGTH_SHORT).show();}});}});mQueue.add(stringRequest);

我们可以发现volley框架真的简单了很多，不需要我们去设置一些HTTP的通信属性以及一些回调方法，让我们只用去关心如何处理返回的数据即可，那么下面我们来逐条解析一下volley三步操作的每一步。

 RequestQueue mQueue = Volley.newRequestQueue(context); 

 StringRequest stringRequest = new StringRequest(address,  new Response.Listener<String>() {  @Override  public void onResponse(String response) {  Log.d("TAG", response);  }  }, new Response.ErrorListener() {  @Override  public void onErrorResponse(VolleyError error) {  Log.e("TAG", error.getMessage(), error);  }  });  

    mQueue.add(stringRequest); 

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