连接到webservice时AndroidClient中的NullPointerException

连接到Webservice时，我的Android客户端中出现NullPointerException。我真的不知道为什么...连接到webservice时AndroidClient中的NullPointerException

的logcat：

01-12 18:46:55.062: E/AndroidRuntime(831): FATAL EXCEPTION: main 
01-12 18:46:55.062: E/AndroidRuntime(831): java.lang.RuntimeException: Unable to start activity ComponentInfo{pl.webcentral.androidclient1/pl.webcentral.androidclient1.MainActivity}: java.lang.NullPointerException 
01-12 18:46:55.062: E/AndroidRuntime(831): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2059) 
01-12 18:46:55.062: E/AndroidRuntime(831): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084) 
01-12 18:46:55.062: E/AndroidRuntime(831): at android.app.ActivityThread.access$600(ActivityThread.java:130) 
01-12 18:46:55.062: E/AndroidRuntime(831): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195) 
01-12 18:46:55.062: E/AndroidRuntime(831): at android.os.Handler.dispatchMessage(Handler.java:99) 
01-12 18:46:55.062: E/AndroidRuntime(831): at android.os.Looper.loop(Looper.java:137) 
01-12 18:46:55.062: E/AndroidRuntime(831): at android.app.ActivityThread.main(ActivityThread.java:4745) 
01-12 18:46:55.062: E/AndroidRuntime(831): at java.lang.reflect.Method.invokeNative(Native Method) 
01-12 18:46:55.062: E/AndroidRuntime(831): at java.lang.reflect.Method.invoke(Method.java:511) 
01-12 18:46:55.062: E/AndroidRuntime(831): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786) 
01-12 18:46:55.062: E/AndroidRuntime(831): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 
01-12 18:46:55.062: E/AndroidRuntime(831): at dalvik.system.NativeStart.main(Native Method) 
01-12 18:46:55.062: E/AndroidRuntime(831): Caused by: java.lang.NullPointerException 
01-12 18:46:55.062: E/AndroidRuntime(831): at pl.webcentral.androidclient1.GameAndroidUtil.callGameStatus(GameAndroidUtil.java:106) 
01-12 18:46:55.062: E/AndroidRuntime(831): at pl.webcentral.androidclient1.GameAndroidUtil.testGameWS(GameAndroidUtil.java:21) 
01-12 18:46:55.062: E/AndroidRuntime(831): at pl.webcentral.androidclient1.MainActivity.onCreate(MainActivity.java:24) 
01-12 18:46:55.062: E/AndroidRuntime(831): at android.app.Activity.performCreate(Activity.java:5008) 
01-12 18:46:55.062: E/AndroidRuntime(831): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079) 
01-12 18:46:55.062: E/AndroidRuntime(831): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2023) 
01-12 18:46:55.062: E/AndroidRuntime(831): ... 11 more

GameAndroidUtil：

package pl.webcentral.androidclient1; 

import org.ksoap2.SoapEnvelope; 
import org.ksoap2.SoapFault; 
import org.ksoap2.serialization.PropertyInfo; 
import org.ksoap2.serialization.SoapObject; 
import org.ksoap2.serialization.SoapPrimitive; 
import org.ksoap2.serialization.SoapSerializationEnvelope; 
import org.ksoap2.transport.HttpTransportSE; 

public class GameAndroidUtil { 
    private static final String NAMESPACE = "http://game.webcentral.pl/"; 
    private static final String SOAP_ACTION = ""; 
    private static final String WSDL_URL = "http://10.0.2.2:8080/ReversiGameWS/services/GameWS?wsdl"; 

    public static void testGameWS() throws SoapFault { 

     String session1 = callGameLogin("Marcin 1"); 


     GameStatus gameStatus = callGameStatus(session1); 
     System.out.println("Status gracza 1 " + gameStatus.getLastMove() + " " + gameStatus.isYourMove()); 


     String session2 = callGameLogin("Marcin 2"); 


     gameStatus = callGameStatus(session2); 
     System.out.println("Status gracza 2 " + gameStatus.getLastMove() + " " + gameStatus.isYourMove()); 

     gameStatus = callGameStatus(session1); 
     System.out.println("Status gracza 1 " + gameStatus.getLastMove() + " " + gameStatus.isYourMove()); 


     try { 
      callGameAddMove(session1, 5); 
     } catch (Exception e) { 
      System.out.println("Złapaliśmy wyjątek zgodnie z założeniem"); 
     } 


     callGameAddMove(session2, 5); 


     gameStatus = callGameStatus(session2); 
     System.out.println("Status gracza 1 " + gameStatus.getLastMove() + " " + gameStatus.isYourMove()); 

     gameStatus = callGameStatus(session1); 
     System.out.println("Status gracza 2 " + gameStatus.getLastMove() + " " + gameStatus.isYourMove()); 
    } 

    private static String callGameLogin(String userName) { 
     String METHOD_NAME = "login"; 

     SoapObject request = new SoapObject(NAMESPACE, METHOD_NAME); 
     SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(SoapEnvelope.VER11); 

     PropertyInfo propInfo=new PropertyInfo(); 
     propInfo.setName("arg0"); 
     propInfo.setType(PropertyInfo.STRING_CLASS); 
     propInfo.setValue(userName); 

     request.addProperty(propInfo); 

     envelope.setOutputSoapObject(request); 
     HttpTransportSE androidHttpTransport = new HttpTransportSE(WSDL_URL); 

     try { 
      androidHttpTransport.call(SOAP_ACTION, envelope); 

      SoapPrimitive resultsRequestSOAP = (SoapPrimitive) envelope.getResponse(); 

      return resultsRequestSOAP.toString(); 

     } catch (Exception e) { 
      throw new RuntimeException("Unexpected exception", e); 
     } 
    } 
    private static GameStatus callGameStatus(String sessionId) throws SoapFault { 
     String METHOD_NAME = "getGameStatus"; 

     SoapObject request = new SoapObject(NAMESPACE, METHOD_NAME); 
     SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(SoapEnvelope.VER11); 

     PropertyInfo propInfo=new PropertyInfo(); 
     propInfo.setName("arg0"); 
     propInfo.setType(PropertyInfo.STRING_CLASS); 
     propInfo.setValue(sessionId); 

     request.addProperty(propInfo); 

     envelope.setOutputSoapObject(request); 
     HttpTransportSE androidHttpTransport = new HttpTransportSE(WSDL_URL); 

     try { 
      androidHttpTransport.call(SOAP_ACTION, envelope); 
     } catch (Exception e) { 
      throw new RuntimeException("Unexpected exception", e); 
     } 

     try { 
      SoapObject response = (SoapObject)envelope.getResponse(); 

      GameStatus gameStatus = new GameStatus(); 
      if (response.hasProperty("lastMove")) { 
       gameStatus.setLastMove(Integer.parseInt(response.getProperty("lastMove").toString())); 
      } 
      gameStatus.setYourMove(Boolean.parseBoolean(response.getProperty("yourMove").toString())); 

      return gameStatus; 
     } catch (SoapFault e) { 
      System.out.println("Error adding move: " + e.faultstring);//można to ładnie jakoś pokazać na ekranie 
      throw e; 
     } 

    } 
    private static void callGameAddMove(String sessionId, Integer move) throws SoapFault { 
     String METHOD_NAME = "addMove"; 

     SoapObject request = new SoapObject(NAMESPACE, METHOD_NAME); 
     SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(SoapEnvelope.VER11); 

     PropertyInfo propInfo=new PropertyInfo(); 
     propInfo.setName("arg0"); 
     propInfo.setType(PropertyInfo.STRING_CLASS); 
     propInfo.setValue(sessionId); 

     request.addProperty(propInfo); 

     propInfo=new PropertyInfo(); 
     propInfo.setName("arg1"); 
     propInfo.setType(PropertyInfo.INTEGER_CLASS); 
     propInfo.setValue(move); 

     request.addProperty(propInfo); 

     envelope.setOutputSoapObject(request); 
     HttpTransportSE androidHttpTransport = new HttpTransportSE(WSDL_URL); 

     try { 
      androidHttpTransport.call(SOAP_ACTION, envelope); 
     } catch (Exception e) { 
      throw new RuntimeException("Unexpected exception", e); 
     } 

     try { 
      SoapPrimitive resultsRequestSOAP = (SoapPrimitive) envelope.getResponse(); 
     } catch (SoapFault e) { 
      System.out.println("Error adding move: " + e.faultstring);//można to ładnie jakoś pokazać na ekranie 
      throw e; 
     } 
    } 

}

，问题就在这里：

  gameStatus.setLastMove(Integer.parseInt(response.getProperty("lastMove").toString());

为什么会这样呢？只有当响应具有此属性时才会执行此行。如果有，为什么是空指针？

来源

2013-01-12 user208030

在调用''gameStatus.setLastMove''之前，您可以添加''Log.d（“lastMove”，response.getProperty（“lastMove”）+“”）''''。你知道，只是为了确定。 – harism

有没有可能'request'具有键'“lastMove”'但数据是'null'？ – Sam

这个Log.d（）应该改变什么？添加它但没有结果。 – user208030

看来，登录.d（“lastMove”，response.getProperty（“lastMove”）。toString（））;现在引起NullPointerException ...

很明显，response.getProperty("lastMove")是问题所在。这意味着，response有一个键"lastMove"但价值本身null ...只需使用：

if (response.hasProperty("lastMove") && response.getProperty("lastMove") != null) { 
    gameStatus.setLastMove(Integer.parseInt(response.getProperty("lastMove").toString())); 
}

（如果你控制SOAPObject是如何创建的，你应该找出你为什么保存在一个空值）

来源

2013-01-12 19:51:57 Sam

  gameStatus.setLastMove(Integer.parseInt(response.getProperty("lastMove").toString()));

下面的线为空，这就是为什么空指针异常，请添加日志n检查出来
response.getProperty（ “lastMove”）。的toString（）

来源

2013-01-12 18:15:32

为什么所有这些使用Log进行调试的讨论？包括NPE在内，找到大多数问题是一种糟糕的方式。只需简单地通过调试器来检查变量。这就是我们应该教新人。 – Simon

我们每个人都有不同的想法来调试解决方案。我首选日志会帮助他。 –

我加入，但我没有看到它在我的logcat ... – user208030

连接到webservice时AndroidClient中的NullPointerException

回答

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