Android 3.0 访问WebService 出现 android.os.NetworkOnMainThreadException异常

Android 3.0 访问WebService 出现 android.os.NetworkOnMainThreadException异常

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以前用2.2 访问WebService没有问题，到3.0上访问出现android.os.NetworkOnMainThreadException

找了资料经过实践，解决方法是在activity类中的onCreate方法中添加strict代码，如下：

Java代码

1. public void onCreate() {
2. .......
3. StrictMode.setThreadPolicy(new StrictMode.ThreadPolicy.Builder()
4. .detectDiskReads()
5. .detectDiskWrites()
6. .detectNetwork() // or .detectAll() for all detectable problems
7. .penaltyLog()
8. .build());
9. StrictMode.setVmPolicy(new StrictMode.VmPolicy.Builder()
10. .detectLeakedSqlLiteObjects()
11. .penaltyLog()
12. .penaltyDeath()
13. .build());
14. ......
15. }

似乎是3.0在网络上做了更加严格的限制

package org.sword.android;

import java.util.ArrayList;

import java.util.List;

import org.apache.http.HttpResponse;

import org.apache.http.client.entity.UrlEncodedFormEntity;

import org.apache.http.client.methods.HttpPost;

import org.apache.http.impl.client.DefaultHttpClient;

import org.apache.http.message.BasicNameValuePair;

import org.apache.http.protocol.HTTP;

import org.apache.http.util.EntityUtils;

import android.app.Activity;

import android.os.Bundle;

import android.os.StrictMode;

import android.widget.Button;

public class InternetActivity extends Activity {

private static final String SERVER_UTL = "http://www.webservicex.net/WeatherForecast.asmx/GetWeatherByZipCode";

private Button button;

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

StrictMode.setThreadPolicy(new StrictMode.ThreadPolicy.Builder()

.detectDiskReads()

.detectDiskWrites()

.detectNetwork() // or .detectAll() for all detectable problems

.penaltyLog()

.build());

StrictMode.setVmPolicy(new StrictMode.VmPolicy.Builder()

.detectLeakedSqlLiteObjects()

.detectLeakedClosableObjects()

.penaltyLog()

.penaltyDeath()

.build());

getWeather();

}

private void getWeather(){

try {

final String SERVER_URL = "http://webservice.webxml.com.cn/WebServices/WeatherWS.asmx/getWeather"; // 定义需要获取的内容来源地址

HttpPost request = new HttpPost(SERVER_URL); // 根据内容来源地址创建一个Http请求

List params = new ArrayList();

params.add(new BasicNameValuePair("theCityCode", "长沙")); // 添加必须的参数

params.add(new BasicNameValuePair("theUserID", "")); // 添加必须的参数

request.setEntity(new UrlEncodedFormEntity(params, HTTP.UTF_8)); // 设置参数的编码

HttpResponse httpResponse = new DefaultHttpClient().execute(request); // 发送请求并获取反馈

// 解析返回的内容

if (httpResponse.getStatusLine().getStatusCode() != 404)

{

String result = EntityUtils.toString(httpResponse.getEntity());

System.out.println("result =" + result);

}

} catch (Exception e) {

e.printStackTrace();

}

}

}