1

我尝试使用此代码从 Web 服务接收数据，但发生致命错误

package com.example.lo2i05;

import java.io.IOException;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
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 org.xmlpull.v1.XmlPullParserException;
import android.widget.Button;
import android.widget.TextView;

public class MainActivity extends Activity {
    private static String SOAP_ACTION = "http://tempuri.org/CelsiusToFahrenheit";
    private static String NAMESPACE = "http://tempuri.org/";
    private static String METHOD_NAME = "CelsiusToFahrenheit";
    private static String URL = "http://www.w3schools.com/webservices/tempconvert.asmx?WSDL";
    private TextView tv;
    private Button btn;

    @Override
    protected void onCreate(Bundle savedInstanceState) 
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
         tv = (TextView)findViewById(R.id.txt);
         btn = (Button)findViewById(R.id.btn);
         btn.setOnClickListener(new View.OnClickListener() 
         {
            @Override
            public void onClick(View arg0) 
         {

                final SoapObject request = new SoapObject(NAMESPACE, METHOD_NAME);             
                 request.addProperty("Celsius","32"); 
                 final SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(SoapEnvelope.VER11);
                 envelope.setOutputSoapObject(request);
                 envelope.dotNet = true;
                 try 
                    {
                            HttpTransportSE androidHttpTransport = new HttpTransportSE(URL);
                            androidHttpTransport.call(SOAP_ACTION, envelope);                    
                            SoapPrimitive result = (SoapPrimitive) envelope.getResponse();          
                            String r = result.toString();
                            tv.setText(r);
                    }
                    catch (IOException e) 
                    {
                           tv.setText("1");
                    }
                    catch (XmlPullParserException e) 
                    {
                           tv.setText("2");
                    }   
         }
        });

       } 
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.activity_main, menu);
        return true;
    }

}

这是一个 LogCat

11-24 23:04:03.100: W/IInputConnectionWrapper(1155): getSelectedText on inactive InputConnection
11-24 23:04:03.100: W/IInputConnectionWrapper(1155): setComposingText on inactive InputConnection
11-24 23:04:03.100: W/IInputConnectionWrapper(1155): getExtractedText on inactive InputConnection
11-24 23:04:08.135: D/GestureDetector(1155): [Surface Touch Event] mSweepDown False, mLRSDCnt : -1 mTouchCnt : 2 mFalseSizeCnt:0
11-24 23:04:08.165: D/AndroidRuntime(1155): Shutting down VM
11-24 23:04:08.165: W/dalvikvm(1155): threadid=1: thread exiting with uncaught exception (group=0x412862a0)
11-24 23:04:08.170: E/AndroidRuntime(1155): FATAL EXCEPTION: main
11-24 23:04:08.170: E/AndroidRuntime(1155): android.os.NetworkOnMainThreadException
11-24 23:04:08.170: E/AndroidRuntime(1155):     at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1118)
11-24 23:04:08.170: E/AndroidRuntime(1155):     at java.net.InetAddress.lookupHostByName(InetAddress.java:385)
11-24 23:04:08.170: E/AndroidRuntime(1155):     at java.net.InetAddress.getAllByNameImpl(InetAddress.java:236)
11-24 23:04:08.170: E/AndroidRuntime(1155):     at java.net.InetAddress.getAllByName(InetAddress.java:214)
11-24 23:04:08.170: E/AndroidRuntime(1155):     at libcore.net.http.HttpConnection.<init>(HttpConnection.java:70)
11-24 23:04:08.170: E/AndroidRuntime(1155):     at libcore.net.http.HttpConnection.<init>(HttpConnection.java:50)
11-24 23:04:08.170: E/AndroidRuntime(1155):     at libcore.net.http.HttpConnection$Address.connect(HttpConnection.java:340)
11-24 23:04:08.170: E/AndroidRuntime(1155):     at libcore.net.http.HttpConnectionPool.get(HttpConnectionPool.java:87)
11-24 23:04:08.170: E/AndroidRuntime(1155):     at libcore.net.http.HttpConnection.connect(HttpConnection.java:128)
11-24 23:04:08.170: E/AndroidRuntime(1155):     at libcore.net.http.HttpEngine.openSocketConnection(HttpEngine.java:315)
11-24 23:04:08.170: E/AndroidRuntime(1155):     at libcore.net.http.HttpEngine.connect(HttpEngine.java:310)
11-24 23:04:08.170: E/AndroidRuntime(1155):     at libcore.net.http.HttpEngine.sendSocketRequest(HttpEngine.java:289)
11-24 23:04:08.170: E/AndroidRuntime(1155):     at libcore.net.http.HttpEngine.sendRequest(HttpEngine.java:239)
11-24 23:04:08.170: E/AndroidRuntime(1155):     at libcore.net.http.HttpURLConnectionImpl.connect(HttpURLConnectionImpl.java:80)
11-24 23:04:08.170: E/AndroidRuntime(1155):     at libcore.net.http.HttpURLConnectionImpl.getOutputStream(HttpURLConnectionImpl.java:188)
11-24 23:04:08.170: E/AndroidRuntime(1155):     at org.ksoap2.transport.ServiceConnectionSE.openOutputStream(ServiceConnectionSE.java:109)
11-24 23:04:08.170: E/AndroidRuntime(1155):     at org.ksoap2.transport.HttpTransportSE.call(HttpTransportSE.java:157)
11-24 23:04:08.170: E/AndroidRuntime(1155):     at org.ksoap2.transport.HttpTransportSE.call(HttpTransportSE.java:96)
11-24 23:04:08.170: E/AndroidRuntime(1155):     at com.example.lo2i05.MainActivity$1.onClick(MainActivity.java:46)
11-24 23:04:08.170: E/AndroidRuntime(1155):     at android.view.View.performClick(View.java:4223)
11-24 23:04:08.170: E/AndroidRuntime(1155):     at android.view.View$PerformClick.run(View.java:17275)
11-24 23:04:08.170: E/AndroidRuntime(1155):     at android.os.Handler.handleCallback(Handler.java:615)
11-24 23:04:08.170: E/AndroidRuntime(1155):     at android.os.Handler.dispatchMessage(Handler.java:92)
11-24 23:04:08.170: E/AndroidRuntime(1155):     at android.os.Looper.loop(Looper.java:137)
11-24 23:04:08.170: E/AndroidRuntime(1155):     at android.app.ActivityThread.main(ActivityThread.java:4898)
11-24 23:04:08.170: E/AndroidRuntime(1155):     at java.lang.reflect.Method.invokeNative(Native Method)
11-24 23:04:08.170: E/AndroidRuntime(1155):     at java.lang.reflect.Method.invoke(Method.java:511)
11-24 23:04:08.170: E/AndroidRuntime(1155):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1008)
11-24 23:04:08.170: E/AndroidRuntime(1155):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:775)
11-24 23:04:08.170: E/AndroidRuntime(1155):     at dalvik.system.NativeStart.main(Native Method)
11-24 23:09:16.970: I/Process(1155): Sending signal. PID: 1155 SIG: 9

Android 版本：4.2（果冻豆）。

我在清单中添加了访问 Internet 的权限。

新代码 (1.0)

package com.example.lo2i05;

import android.os.AsyncTask;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import org.ksoap2.SoapEnvelope;
import org.ksoap2.serialization.SoapObject;
import org.ksoap2.serialization.SoapSerializationEnvelope;
import org.ksoap2.transport.HttpTransportSE;
import android.widget.Button;
import android.widget.TextView;

public class MainActivity extends Activity {
    private static String SOAP_ACTION = "http://tempuri.org/CelsiusToFahrenheit";
    private static String NAMESPACE = "http://tempuri.org/";
    private static String METHOD_NAME = "CelsiusToFahrenheit";
    private static String URL = "http://www.w3schools.com/webservices/tempconvert.asmx?WSDL";
    private TextView tv;
    private Button btn;

    @Override
    protected void onCreate(Bundle savedInstanceState) 
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
         tv = (TextView)findViewById(R.id.txt);
         btn = (Button)findViewById(R.id.btn);
         btn.setOnClickListener(new View.OnClickListener() 
         {
            @Override
            public void onClick(View arg0) 
         {
                 final SoapObject request = new SoapObject(NAMESPACE, METHOD_NAME);             
                 request.addProperty("Celsius","32"); 
                 final SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(SoapEnvelope.VER12);
                 envelope.setOutputSoapObject(request);
                 envelope.dotNet = true;
                 new AsyncTask<Void, Void, Boolean>() {
                    SoapObject obj;

                    @Override
                    protected Boolean doInBackground(Void... params) {
                           //here you can do your background network job
                        try{ HttpTransportSE androidHttpTransport = new HttpTransportSE(URL);          
                               androidHttpTransport.call(SOAP_ACTION, envelope);             
                               obj = (SoapObject)envelope.getResponse();
                               return true;  }
                         catch (Exception e)  {e.printStackTrace();   
                                 return false;}}
                    @Override
                    protected void onPostExecute(Boolean result) {
                     //here you can do your UI job
                        if (!result) 
                            tv.setText("Error");
                        else 
                            tv.setText(obj.getProperty(0).toString());
                        super.onPostExecute(result);
                    }
                }.execute();
         }
        });

       } 
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.activity_main, menu);
        return true;
    }

}

========================================

日志猫

11-24 23:37:34.120: E/Trace(2671): error opening trace file: No such file or directory (2)
11-24 23:37:34.235: D/libEGL(2671): loaded /system/lib/egl/libEGL_mali.so
11-24 23:37:34.240: D/libEGL(2671): loaded /system/lib/egl/libGLESv1_CM_mali.so
11-24 23:37:34.240: D/libEGL(2671): loaded /system/lib/egl/libGLESv2_mali.so
11-24 23:37:34.245: D/(2671): Device driver API match
11-24 23:37:34.245: D/(2671): Device driver API version: 10
11-24 23:37:34.245: D/(2671): User space API version: 10 
11-24 23:37:34.245: D/(2671): mali: REVISION=Linux-r2p4-02rel0 BUILD_DATE=Wed Sep 12 17:53:53 KST 2012 
11-24 23:37:34.275: D/OpenGLRenderer(2671): Enabling debug mode 0
11-24 23:37:35.895: D/GestureDetector(2671): [Surface Touch Event] mSweepDown False, mLRSDCnt : -1 mTouchCnt : 2 mFalseSizeCnt:0
11-24 23:37:50.615: W/System.err(2671): java.lang.ClassCastException: org.ksoap2.serialization.SoapPrimitive cannot be cast to org.ksoap2.serialization.SoapObject
11-24 23:37:50.615: W/System.err(2671):     at com.example.lo2i05.MainActivity$1$1.doInBackground(MainActivity.java:48)
11-24 23:37:50.615: W/System.err(2671):     at com.example.lo2i05.MainActivity$1$1.doInBackground(MainActivity.java:1)
11-24 23:37:50.620: W/System.err(2671):     at android.os.AsyncTask$2.call(AsyncTask.java:287)
11-24 23:37:50.620: W/System.err(2671):     at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
11-24 23:37:50.620: W/System.err(2671):     at java.util.concurrent.FutureTask.run(FutureTask.java:137)
11-24 23:37:50.620: W/System.err(2671):     at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
11-24 23:37:50.620: W/System.err(2671):     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
11-24 23:37:50.620: W/System.err(2671):     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
11-24 23:37:50.620: W/System.err(2671):     at java.lang.Thread.run(Thread.java:856)
11-24 23:38:05.935: W/IInputConnectionWrapper(2671): getSelectedText on inactive InputConnection
11-24 23:38:05.935: W/IInputConnectionWrapper(2671): setComposingText on inactive InputConnection
11-24 23:38:05.935: W/IInputConnectionWrapper(2671): getExtractedText on inactive InputConnection
4

2 回答 2

2

看看这个http://developer.android.com/reference/android/os/NetworkOnMainThreadException.html。根据官方文档，如果您使用 Honeycomb SDK 或更高版本，则不应将网络操作放在主/UI 线程上。允许针对早期 SDK 版本的应用程序在其主事件循环线程上进行联网，但强烈建议不要这样做，因为它会阻塞 UI 并可能导致 ANR。

您需要使用后台线程或AsyncTask进行网络操作以避免出现此异常。

作为一般规则，总是将耗时的任务放在后台线程或AsyncTask.

编辑：

更改代码中的以下行

obj = (SoapObject)envelope.getResponse();

至

SoapPrimitive result = (SoapPrimitive) envelope.getResponse();
于 2012-11-24T20:17:02.847 回答
2

尝试像这样异步：

public class MainActivity extends Activity {
private static String SOAP_ACTION = "http://tempuri.org/CelsiusToFahrenheit";
private static String NAMESPACE = "http://tempuri.org/";
private static String METHOD_NAME = "CelsiusToFahrenheit";
private static String URL = "http://www.w3schools.com/webservices/tempconvert.asmx?WSDL";
private TextView tv;
private Button btn;

@Override
protected void onCreate(Bundle savedInstanceState) 
{
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
     tv = (TextView)findViewById(R.id.txt);
     btn = (Button)findViewById(R.id.btn);
     btn.setOnClickListener(new View.OnClickListener() 
     {
        @Override
        public void onClick(View arg0) 
     {
      new MyTask().execute();
      }
    });
  }
public class MyTask extends AsyncTask<Void, Void, String> {

    ProgressDialog progress;
        String response = "";

      public void onPreExecute() {

        super.onPreExecute();
      }

    @Override
    protected Stirng doInBackground(Void... arg0) {
             final SoapObject request = new SoapObject(NAMESPACE, METHOD_NAME);             
             request.addProperty("Celsius","32"); 
             final SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(SoapEnvelope.VER11);
             envelope.setOutputSoapObject(request);
             envelope.dotNet = true;
             try 
                {
                        HttpTransportSE androidHttpTransport = new HttpTransportSE(URL);
                        androidHttpTransport.call(SOAP_ACTION, envelope);                    
                        SoapPrimitive result = (SoapPrimitive) envelope.getResponse();          
                         response = result.toString();

                }
                catch (IOException e) 
                {
                 response = "1";
                }
                catch (XmlPullParserException e) 
                {
                 response = "2";
                } 

        return response;
    }
    @Override
    public void onPostExecute(String res) {

                if(!(res.equalsIgnoreCase("")))
                {
                 tv.setText(res);
                }

      }
    }
 }

现在试试这个

于 2012-11-24T20:31:28.643 回答