android.os.NetworkOnMainThreadException的web服务(KSOAP)
我是新来的Android编程,并试图在此示例程序中使用Web服务:android.os.NetworkOnMainThreadException的web服务(KSOAP)
我使用Android 4.1和我的IDE就是Eclipse朱诺。我认为编程部分没问题,但可能是连接问题。
package com.example.webserviceexample;
import java.io.IOException;
import org.ksoap2.SoapEnvelope;
import org.ksoap2.SoapFault;
import org.ksoap2.serialization.SoapObject;
import org.ksoap2.serialization.SoapPrimitive;
import org.ksoap2.serialization.SoapSerializationEnvelope;
import org.ksoap2.transport.HttpTransportSE;
import org.xmlpull.v1.XmlPullParserException;
import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
public class MainActivity extends Activity {
final static String NAMESPACE = "http://tempuri.org/";
final static String METHOD_NAME = "CelsiusToFahrenheit";
final static String SOAP_ACTION = "http://tempuri.org/CelsiusToFahrenheit";
final static String URL = "http://www.w3schools.com/webservices/tempconvert.asmx";
TextView sonuc;
EditText deger;
Button hesapla;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
deger = (EditText) findViewById(R.id.deger);
sonuc = (TextView) findViewById(R.id.flag);
hesapla = (Button) findViewById(R.id.hesapla);
hesapla.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
//request info
SoapObject Request = new SoapObject(NAMESPACE, METHOD_NAME);
Request.addProperty("Celcius",deger.getText().toString());
//envelope
SoapSerializationEnvelope soapEnvelope = new SoapSerializationEnvelope(SoapEnvelope.VER11);
soapEnvelope.dotNet = true; //.NET = true, php = false
//putting request to the envelope
soapEnvelope.setOutputSoapObject(Request);
//transferring data
HttpTransportSE aht = new HttpTransportSE(URL); //prepare
//start
try {
aht.call(SOAP_ACTION, soapEnvelope);
}
catch (IOException e) {
e.printStackTrace();
}
catch (XmlPullParserException e)
{
e.printStackTrace();
}
//waiting and getting response.
String result;
try {
// we are creating SoapPrimitive Object as waiting for simple variable.
result = "Fahrenheit:" + soapEnvelope.getResponse();
//writing the result to the textView
sonuc.setText(result);
}
catch (SoapFault e) {
e.printStackTrace();
}
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
}
不过,我得到这个错误:
08-15 11:45:26.294: E/AndroidRuntime(641): FATAL EXCEPTION: main
08-15 11:45:26.294: E/AndroidRuntime(641): android.os.NetworkOnMainThreadException
08-15 11:45:26.294: E/AndroidRuntime(641): at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1117)
08-15 11:45:26.294: E/AndroidRuntime(641): at java.net.InetAddress.lookupHostByName(InetAddress.java:385)
08-15 11:45:26.294: E/AndroidRuntime(641): at java.net.InetAddress.getAllByNameImpl(InetAddress.java:236)
08-15 11:45:26.294: E/AndroidRuntime(641): at java.net.InetAddress.getAllByName(InetAddress.java:214)
08-15 11:45:26.294: E/AndroidRuntime(641): at libcore.net.http.HttpConnection.<init>(HttpConnection.java:70)
08-15 11:45:26.294: E/AndroidRuntime(641): at libcore.net.http.HttpConnection.<init>(HttpConnection.java:50)
08-15 11:45:26.294: E/AndroidRuntime(641): at libcore.net.http.HttpConnection$Address.connect(HttpConnection.java:341)
08-15 11:45:26.294: E/AndroidRuntime(641): at libcore.net.http.HttpConnectionPool.get(HttpConnectionPool.java:87)
08-15 11:45:26.294: E/AndroidRuntime(641): at libcore.net.http.HttpConnection.connect(HttpConnection.java:128)
08-15 11:45:26.294: E/AndroidRuntime(641): at libcore.net.http.HttpEngine.openSocketConnection(HttpEngine.java:315)
08-15 11:45:26.294: E/AndroidRuntime(641): at libcore.net.http.HttpEngine.connect(HttpEngine.java:310)
08-15 11:45:26.294: E/AndroidRuntime(641): at libcore.net.http.HttpEngine.sendSocketRequest(HttpEngine.java:289)
08-15 11:45:26.294: E/AndroidRuntime(641): at libcore.net.http.HttpEngine.sendRequest(HttpEngine.java:239)
08-15 11:45:26.294: E/AndroidRuntime(641): at libcore.net.http.HttpURLConnectionImpl.connect(HttpURLConnectionImpl.java:80)
08-15 11:45:26.294: E/AndroidRuntime(641): at org.ksoap2.transport.ServiceConnectionSE.connect(ServiceConnectionSE.java:76)
08-15 11:45:26.294: E/AndroidRuntime(641): at org.ksoap2.transport.HttpTransportSE.call(HttpTransportSE.java:146)
08-15 11:45:26.294: E/AndroidRuntime(641): at org.ksoap2.transport.HttpTransportSE.call(HttpTransportSE.java:95)
08-15 11:45:26.294: E/AndroidRuntime(641): at com.example.webserviceexample.MainActivity$1.onClick(MainActivity.java:61)
08-15 11:45:26.294: E/AndroidRuntime(641): at android.view.View.performClick(View.java:4084)
08-15 11:45:26.294: E/AndroidRuntime(641): at android.view.View$PerformClick.run(View.java:16966)
08-15 11:45:26.294: E/AndroidRuntime(641): at android.os.Handler.handleCallback(Handler.java:615)
08-15 11:45:26.294: E/AndroidRuntime(641): at android.os.Handler.dispatchMessage(Handler.java:92)
08-15 11:45:26.294: E/AndroidRuntime(641): at android.os.Looper.loop(Looper.java:137)
08-15 11:45:26.294: E/AndroidRuntime(641): at android.app.ActivityThread.main(ActivityThread.java:4745)
08-15 11:45:26.294: E/AndroidRuntime(641): at java.lang.reflect.Method.invokeNative(Native Method)
08-15 11:45:26.294: E/AndroidRuntime(641): at java.lang.reflect.Method.invoke(Method.java:511)
08-15 11:45:26.294: E/AndroidRuntime(641): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
08-15 11:45:26.294: E/AndroidRuntime(641): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
08-15 11:45:26.294: E/AndroidRuntime(641): at dalvik.system.NativeStart.main(Native Method)
那么什么可以是问题?
您无法在主线程上执行网络操作。 结帐:http://developer.android.com/reference/android/os/AsyncTask.html
无痛背景线程:)
编辑:由于我仍然得到了赞成票这个答案即使它是几年前我就不再建议使用的AsyncTask。它有许多已知的问题,这里描述(http://blog.danlew.net/2014/06/21/the-hidden-pitfalls-of-asynctask/)。相反,我会敦促你使用Retrofit或者其他处理线程的好客户端。
谢谢我会尝试:) – skynyrd 2012-08-16 07:09:25
我试过了,现在完成了,再次感谢:)顺便说一句,这个问题不会发生在Android 2.2 – skynyrd 2012-08-17 13:21:39
那么它仍然是最好的练习总是在后台进行网络操作,否则你的应用可能会显示为“laggy”。乐于帮助! – Slickelito 2012-08-17 13:40:02
完整的示例:
import org.ksoap2.SoapEnvelope;
import org.ksoap2.serialization.SoapObject;
import org.ksoap2.serialization.SoapPrimitive;
import org.ksoap2.serialization.SoapSerializationEnvelope;
import org.ksoap2.transport.HttpTransportSE;
import android.app.Activity;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
public class MainActivity extends Activity {
private String TAG ="Vik";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
AsyncCallWS task = new AsyncCallWS();
task.execute();
}
private class AsyncCallWS extends AsyncTask<Void, Void, Void> {
@Override
protected Void doInBackground(Void... params) {
Log.i(TAG, "doInBackground");
calculate();
return null;
}
@Override
protected void onPostExecute(Void result) {
Log.i(TAG, "onPostExecute");
}
@Override
protected void onPreExecute() {
Log.i(TAG, "onPreExecute");
}
@Override
protected void onProgressUpdate(Void... values) {
Log.i(TAG, "onProgressUpdate");
}
}
public void calculate()
{
String SOAP_ACTION = "http://tempuri.org/CelsiusToFahrenheit";
String METHOD_NAME = "CelsiusToFahrenheit";
String NAMESPACE = "http://tempuri.org/";
String URL = "http://www.w3schools.com/webservices/tempconvert.asmx";
try {
SoapObject Request = new SoapObject(NAMESPACE, METHOD_NAME);
Request.addProperty("Celsius", "32");
SoapSerializationEnvelope soapEnvelope = new SoapSerializationEnvelope(SoapEnvelope.VER11);
soapEnvelope.dotNet = true;
soapEnvelope.setOutputSoapObject(Request);
HttpTransportSE transport= new HttpTransportSE(URL);
transport.call(SOAP_ACTION, soapEnvelope);
SoapPrimitive resultString = (SoapPrimitive)soapEnvelope.getResponse();
Log.i(TAG, "Result Celsius: " + resultString);
}
catch(Exception ex) {
Log.e(TAG, "Error: " + ex.getMessage());
}
SOAP_ACTION = "http://tempuri.org/FahrenheitToCelsius";
METHOD_NAME = "FahrenheitToCelsius";
try {
SoapObject Request = new SoapObject(NAMESPACE, METHOD_NAME);
Request.addProperty("Fahrenheit", "100");
SoapSerializationEnvelope soapEnvelope = new SoapSerializationEnvelope(SoapEnvelope.VER11);
soapEnvelope.dotNet = true;
soapEnvelope.setOutputSoapObject(Request);
HttpTransportSE transport= new HttpTransportSE(URL);
transport.call(SOAP_ACTION, soapEnvelope);
SoapPrimitive resultString = (SoapPrimitive)soapEnvelope.getResponse();
Log.i(TAG, "Result Fahrenheit: " + resultString);
}
catch(Exception ex) {
Log.e(TAG, "Error: " + ex.getMessage());
}
}
}
尝试增加strictmode到您的应用程序。在您的onCreate方法中,添加
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
您的代码在测试阶段不推荐在最终代码中使用,因为它在主线程中强制运行它。 – 2014-04-23 13:11:42
您可以参考此问题。 [机器人-OS-networkonmainthreadexception换web服务-KSOAP] [1] [1]:http://*.com/questions/8322057/android-os-networkonmainthreadexception-exception-while-试图呼叫网络服务 – 2012-08-15 12:15:00