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November 12, 2014

How to call a webservice in android.

            In this blog I am going to explain How to call a .Net xml webservice in android with the help of an login WebService.

XML Request

POST /Service.asmx HTTP/1.1
Host: shidhints.com
Content-Type: text/xml; charset=utf-8
Content-Length: length
SOAPAction: "http://shidhints.com/Login"

<?xml version="1.0" encoding="utf-8"?>
<soap:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
  <soap:Body>
    <Login xmlns="http://shidhints.com/">
        <Email>string</Email>
        <Password>string</Password>
    </Login>
  </soap:Body>
</soap:Envelope>

                  In this WebService request Our Function name is  "Login " and the parameters we are passing are "Email" which is "string" format and  "Password" which is also in "string" format.

XML Responc

HTTP/1.1 200 OK
Content-Type: text/xml; charset=utf-8
Content-Length: length

<?xml version="1.0" encoding="utf-8"?>
<soap:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
  <soap:Body>
    <LoginResponse xmlns="http://shidhints.com/">
         <LoginResult>
             <IsValidLogin>boolean</IsValidLogin>
             <ErrorOnFailure>string</ErrorOnFailure>
             <Token>string</Token>
       </LoginResult>
    </LoginResponse>
  </soap:Body>
</soap:Envelope>

               In this WebService response we are getting result through the parameters "IsValidLogin" which is a "boolean" value and  "ErrorOnFailurewhich is a "string" value and  "Tokenwhich is also a "string" value. Here if the "IsValidLogin" is true then it will pass the "Token" otherwise it will pass "ErrorOnFailure" which contains the reason of failure.

Android Code

                  In Android I am calling this WebService with the help of a Library called Ksoap. You can get more about Ksoap form Here. First we need to download the Ksoap .Jar file and add that library to your Android project.

Java Code

private static String NAMESPACE = "http://shidhints.com/";
private static String URL = "http://shidhints.com/Service.asmx?wsdl";



public LoginToken login(String Email, String Password ) throws Exception {
        String METHOD_NAME = "Login";
        String SOAP_ACTION = "http://shidhints.com/Login";

        SoapObject Request = new SoapObject(NAMESPACE, METHOD_NAME);
        Request.addProperty("Email", Email); // Adding Email to request
        Request.addProperty("Password", Password ); // Adding Password to request

        LoginResult loginResult;
        try
        {
            SoapObject response = executeRequest(Request, SOAP_ACTION);
            if(response != null){
                  loginResult= new LoginResult((SoapObject) response.getProperty(0));
                  return loginResult;
            }
        }
        catch(Exception e)
        {
            e.printStackTrace();
        }
return null;
 }

// This function is to call the webservice
private SoapObject executeRequest(SoapObject Request, String SOAP_ACTION) throws IOException{

    System.setProperty("http.keepAlive", "false");
   
    SoapSerializationEnvelope envelope = new  SoapSerializationEnvelope(SoapEnvelope.VER11);
    envelope.dotNet = true;
    envelope.setOutputSoapObject(Request);
    envelope.implicitTypes=true;
    envelope.dotNet = true; 
    envelope.setAddAdornments(false);
    envelope.encodingStyle = SoapSerializationEnvelope.XSD;
    envelope.enc = SoapSerializationEnvelope.ENC;
    envelope.xsd = SoapEnvelope.XSD;
    envelope.xsi = SoapEnvelope.XSI;
     
    HttpTransportSE androidHttpTransport = new HttpTransportSE(URL);
    androidHttpTransport.debug = true; 
    SoapObject response;
    try
           {
               androidHttpTransport.call(SOAP_ACTION, envelope);
               response = (SoapObject) envelope.bodyIn;
                return response;
           }
           catch(Exception e)
           {
               e.printStackTrace();
           }
    return null;
}

                      Here I am executing the request through "executeRequest" function. The result will be in "SoapObject" format. Now I will pass this result to my "LoginResult " class. In that class It will parse the response.

Parsing SoapObject 

 public LoginResult (SoapObject response){
    Boolean LoginStatus= false;
    String Token = "" , ErrorOnFailure = "";
    ValidLogin = response.getProperty("IsValidLogin").toString();
    if(ValidLogin.equalsIgnoreCase("true")){
    LoginStatus=true;
    Token = response.getProperty("Token").toString();
    }else{
    ErrorOnFailure = response.getProperty("ErrorOnFailure").toString();
     } 

}



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