LoginService.asmx

[WebService(Namespace = "Check_Activity")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]

public class LoginService  
{
    MySqlConnection objCon = new MySqlConnection(ConfigurationManager.ConnectionStrings["ActiveConnection"].ConnectionString); 
    MySqlCommand objSqlCmd; 
    MySqlParameter objSqlParam;
    [WebMethod]
    public string LoginStatus(string uid, string pswrd, string category) 
    {
        string returndata = "";
        try
        {
            if (objCon.State != ConnectionState.Open)
            {
                objCon.Open();
            }
            objSqlCmd = new MySqlCommand("rawProcedure", objCon);
            objSqlCmd.CommandType = CommandType.StoredProcedure;
            objSqlCmd.Parameters.AddWithValue("UID", uid);
            objSqlCmd.Parameters.AddWithValue("PASS", pswrd);
            objSqlCmd.Parameters.AddWithValue("CAT", category);
            objSqlParam = new MySqlParameter();
            objSqlParam.ParameterName = "Response";
            objSqlParam.MySqlDbType = MySqlDbType.VarChar;
            objSqlParam.Direction = ParameterDirection.Output;
            objSqlCmd.Parameters.Add(objSqlParam);
            objSqlCmd.ExecuteNonQuery();
            objCon.Close();
            returndata = objSqlParam.Value.ToString();
            return returndata; ;
        }
        catch(Exception ex)
        {
            return returndata = "Exception";
        }
    }
}

activity_main

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity" >

    <EditText
        android:id="@+id/editText1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentRight="true"
        android:layout_alignParentTop="true"
        android:layout_marginTop="41dp"
        android:hint="User ID"
        android:ems="10" >

        <requestFocus />
    </EditText>

    <EditText
        android:id="@+id/editText2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentRight="true"
        android:layout_below="@+id/editText1"
        android:layout_marginTop="50dp"
        android:hint="Password"
        android:ems="10" />

    <EditText
        android:id="@+id/editText3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentRight="true"
        android:layout_below="@+id/editText2"
        android:layout_marginTop="64dp"
        android:hint="Category"
        android:ems="10" />

    

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentRight="true"
        android:layout_below="@+id/editText3"
        android:layout_marginTop="20dp"
        android:onClick="RUN"
        android:text="Get It !" />
    
     <TextView
        android:id="@+id/test"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/button1"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="20dp" />

</RelativeLayout>

MainActivity

public class MainActivity extends Activity {
private static final String SOAP_ACTION = "WSDL_TARGET_NAMESPACE + METHOD";
    
    private static final String OPERATION_NAME = "LoginStatus";// your webservice web method name
    
    private static final String WSDL_TARGET_NAMESPACE = "Check_Activity";
    
    private static final String SOAP_ADDRESS = "http://192.168.1.5:80/LoginService.asmx";
	private TextView textView;
	EditText userId, pass, cat;
	String userId_str, pass_str, cat_str;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		
		if (android.os.Build.VERSION.SDK_INT > 9) {
    		StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
    		StrictMode.setThreadPolicy(policy);
    	}
		
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		
		textView = (TextView) findViewById(R.id.test);
		
		
		
	}	
		
			public void RUN(View v){
		        
				 SoapObject request = new SoapObject(WSDL_TARGET_NAMESPACE,     OPERATION_NAME);
                 PropertyInfo propertyInfo1 = new PropertyInfo();
                 propertyInfo1.type = PropertyInfo.STRING_CLASS;
                 propertyInfo1.name = "userId_str";
                 
                 PropertyInfo propertyInfo2 = new PropertyInfo();
                 propertyInfo2.type = PropertyInfo.STRING_CLASS;
                 propertyInfo2.name = "pass_str";
                 
                 PropertyInfo propertyInfo3 = new PropertyInfo();
                 propertyInfo3.type = PropertyInfo.STRING_CLASS;
                 propertyInfo3.name = "cat_str";
                 
                 userId = (EditText) findViewById(R.id.editText1);
         		 pass = (EditText) findViewById(R.id.editText2);
         		 cat = (EditText) findViewById(R.id.editText3);
                 
         		 userId_str=userId.getText().toString();
         		 pass_str=pass.getText().toString();
         		 cat_str=cat.getText().toString();
                 
         		//request.addProperty(propertyInfo1, userId_str);
         		 request.addPropertyIfValue(propertyInfo1, userId_str);
         		 request.addPropertyIfValue(propertyInfo1, userId_str);
         		 request.addPropertyIfValue(propertyInfo1, userId_str);
                         
                         SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(
                         SoapEnvelope.VER11);
                         envelope.dotNet = true;
                         
                         envelope.setOutputSoapObject(request);
                         
                         HttpTransportSE httpTransport = new HttpTransportSE(SOAP_ADDRESS);
                         
                         try  {                    
                         httpTransport.call(SOAP_ACTION, envelope);                    
                         Object response = envelope.getResponse();                    
                         textView.setText(response.toString());                    
                         }  catch (Exception exception)   {
                        	 textView.setText(exception.toString()+"  Or Invalid Entry");                    
                         }
				
	        }
}