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facing nullpointerexception while consuming kSOAP2 web service  RSS feed

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I have implimented a SOAP web service using Axis. The web service adds two numbers and returns the sum. The code looks like this.

And I have published the web service and its working fine. If I execute it through Axis framework it's working perfectly fine.
And now I am tring to access the web service through Android Activity

This is the utility interface which contains the constants.

And this is the activity code.

The last line in the code is throwing NullPointerException. I know it's bacause "result" is being initialized to null. My Question is where I am going wrong. Please give me the solution on how to consume a web service which takes parameters and also returns some thing in response.

Thans and Regards,
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