Android 3.0 访问WebService 出现 android.os.NetworkOnMainThreadException异常

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



public void onCreate() {

.......

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

.detectDiskReads()

.detectDiskWrites()

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

.penaltyLog()

.build());

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

.detectLeakedSqlLiteObjects()

.penaltyLog()

.penaltyDeath()

.build());

......

}

似乎是3.0在网络上做了更加严格的限制

packageorg.sword.android;

importjava.util.ArrayList;
importjava.util.List;

importorg.apache.http.HttpResponse;
importorg.apache.http.client.entity.UrlEncodedFormEntity;
importorg.apache.http.client.methods.HttpPost;
importorg.apache.http.impl.client.DefaultHttpClient;
importorg.apache.http.message.BasicNameValuePair;
importorg.apache.http.protocol.HTTP;
importorg.apache.http.util.EntityUtils;

importandroid.app.Activity;
importandroid.os.Bundle;
importandroid.os.StrictMode;
importandroid.widget.Button;

public classInternetActivity extends Activity {

private staticfinal String SERVER_UTL ="http://www.webservicex.net/WeatherForecast.asmx/GetWeatherByZipCode";
private Buttonbutton;
@Override
public voidonCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

StrictMode.setThreadPolicy(newStrictMode.ThreadPolicy.Builder()
.detectDiskReads()
.detectDiskWrites()
.detectNetwork() // or.detectAll() for all detectable problems
.penaltyLog()
.build());
StrictMode.setVmPolicy(newStrictMode.VmPolicy.Builder()
.detectLeakedSqlLiteObjects()
.detectLeakedClosableObjects()
.penaltyLog()
.penaltyDeath()
.build());
getWeather();
}

private voidgetWeather(){
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 = newHttpPost(SERVER_URL); // 根据内容来源地址创建一个Http请求
List params = newArrayList();
params.add(newBasicNameValuePair("theCityCode", "长沙")); // 添加必须的参数
params.add(newBasicNameValuePair("theUserID", "")); // 添加必须的参数
request.setEntity(newUrlEncodedFormEntity(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)
{
Stringresult =EntityUtils.toString(httpResponse.getEntity());
System.out.println("result =" + result);
}
} catch (Exception e) {
e.printStackTrace();
}
}
}