HttpTransportSE.call方法经常返回NullPointerException

时间:2013-02-06 07:02:14

标签: android web-services android-ksoap2

我连接到webservice以下载我的应用程序的主数据。因此,在单个下载中,应用程序将需要使用不同的索引来调用Web服务。

在此期间, HttpTransportSE.call 方法有时会返回某些索引的 NullPointerException ,否则它可以正常工作。

我的通话功能是:

public String SoapAction(String[] values){

String[] data = new String[] { "CompanyID", "Username", "Password", "indexNo", "DataString","lDate" };

    SoapObject request = new SoapObject(NAMESPACE, METHOD_NAME);

for(int i = 0; i < data.length; i++){
  PropertyInfo property = new PropertyInfo();
  property.setName(data[i]);
  property.setNamespace(NAMESPACE);
  property.setType(PropertyInfo.STRING_CLASS);
  property.setValue(values[i]); 

  request.addProperty(property);
}

SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(SoapEnvelope.VER11);
envelope.dotNet = true;
envelope.implicitTypes = true;
envelope.setOutputSoapObject(request);

try{
  HttpTransportSE http = new HttpTransportSE(URL);
  http.debug = true;
  System.setProperty("http.keepAlive", "false");

  http.call(SOAP_ACTION, envelope);
}catch (IOException e1) {
  e1.printStackTrace();         
  return "serverError";
} catch (XmlPullParserException e1) {
  e1.printStackTrace();
  return "serverError";     
} catch (Exception e) {
  e.printStackTrace();          
  return "serverError";
}

SoapPrimitive resultString = null;

try{
  resultString = (SoapPrimitive)envelope.getResponse();
}catch (SoapFault e) {
  e.printStackTrace();          
  return "serverError";
}

if(resultString != null){
  return resultString.toString();
} else {
  return "serverError";
}
}

我做了很多谷歌搜索,但找不到解决方案

这是堆栈跟踪:
02-06 14:01:14.136:W / System.err(1504):java.lang.NullPointerException

02-06 14:01:14.136:W / System.err(1504):at org.ksoap2.transport.ServiceConnectionSE.getResponseProperties(ServiceConnectionSE.java:85)

02-06 14:01:14.136:W / System.err(1504):at org.ksoap2.transport.HttpTransportSE.call(HttpTransportSE.java:167)

02-06 14:01:14.136:W / System.err(1504):at org.ksoap2.transport.HttpTransportSE.call(HttpTransportSE.java:96)

02-06 14:29:50.026:W / System.err(1504):at com.c2info.engine.WebServiceConnection.SoapAction(WebServiceConnection.java:49)

02-06 14:29:50.026:W / System.err(1504):at com.c2info.engine.DownloadData.downloadTasks(DownloadData.java:800)

02-06 14:29:50.026:W / System.err(1504):at com.c2info.engine.DownloadData $ 3.run(DownloadData.java:187)

2 个答案:

答案 0 :(得分:1)

我从不添加像你的

这样的属性
request.addProperty("data", "value");

试试这个:

PropertyInfo property = new PropertyInfo();
{
    property.name = "data";
    property.setNamespace(NAMESPACE);
    property.type = PropertyInfo.STRING_CLASS;
    property.setValue("value"); 
}
request.addProperty(property);

也尝试使用

SoapEnvelope.VER11 

而不是VER12

并添加原始

envelope.implicitTypes = true;

您是否在AndroidMAnifest.xml中添加了此权限?

<uses-permission android:name="android.permission.INTERNET"></uses-permission>

答案 1 :(得分:0)

在做了一些研究之后,我发现它发生在服务器繁忙时,当服务器处理你的请求时,HttpTransportSE调用方法超时。默认超时值为20秒。所以,要克服这一点,:

  • 设置合适的超时值

      

    HttpTransportSE http = new HttpTransportSE(URL,30000);

  • 将http.call方法包含在while循环中,并重试“N”,直到获得有效响应为止