Web Service That Returns An Array of Objects With KSOAP

摘要:Web Service That Returns An Array of Objects With KSOAP

In my previous post, I wrote about an example of passing complex objects with KSOAP. In this post, I will write about returning arrays of objects with KSOAP.
If you want to know how to write a method that returns an array of complex objects, look at this code:


public static Category[] GetAllCategories()
    {
        String MethodName = "GetAllCategories";
        SoapObject response = InvokeMethod(URL,MethodName);
        return RetrieveFromSoap(response);
        
    }


Where the function InvokeMethod is :
 


public static SoapObject InvokeMethod(String URL,String MethodName)
    {
        SoapObject request = GetSoapObject(MethodName);
        SoapSerializationEnvelope envelope = GetEnvelope(request);
        return  MakeCall(URL,envelope,NAMESPACE,MethodName);
    }


GetSoapObject() and GetEnvelope() are:
 


public static SoapObject GetSoapObject(String MethodName)
    {
        return new SoapObject(NAMESPACE,MethodName);
    }
    public static SoapSerializationEnvelope GetEnvelope(SoapObject Soap)
    {
        SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(SoapEnvelope.VER11);
        envelope.dotNet = true;
        envelope.setOutputSoapObject(Soap);
        return envelope;
    }


MakeCall() is :


/**
     * 
     * @param URL - The complete URL where the web service resides 
     * @param Envelope - The envelope to be passed
     * @param NAMESPACE - The web method namespace
     * @param METHOD_NAME - The method name
     * @return - SoapObject containing the resultset
     */
    public static SoapObject MakeCall(String URL, SoapSerializationEnvelope Envelope, String NAMESPACE, String METHOD_NAME)
    {
        AndroidHttpTransport androidHttpTransport = new AndroidHttpTransport(URL);
         try
            {
                androidHttpTransport.call(NAMESPACE + METHOD_NAME, Envelope);
                SoapObject response = (SoapObject)Envelope.getResponse();
                return response;
            }
         catch(Exception e)
         {
             e.printStackTrace();
             
         }
         return null;
    }


The most important part for retrieving the actual array of objects (in this case Category objects) is the following:


/**
     * 
     * @param soap - represents the entering Soap object
     * @return returns the list of categories extracted from the response
     */
    public static Category[] RetrieveFromSoap(SoapObject soap)
    {
        Category[] categories = new Category[soap.getPropertyCount()];
        for (int i = 0; i < categories.length; i++) {
            SoapObject pii = (SoapObject)soap.getProperty(i);
            Category category = new Category();
            category.CategoryId = Integer.parseInt(pii.getProperty(0).toString());
            category.Name = pii.getProperty(1).toString();
            category.Description = pii.getProperty(2).toString();
            categories[i] = category;
        }
        return categories;
    }

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