First create solution

Nuvolar.Scanner.Android.Shared/data/Global.js

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+var username = ko.observable("SysAdmin");
+var password = ko.observable("SysAdmin");
+var database = ko.observable(null);
+var query = ko.observable(null);
+
+var resultstatus= ko.observable(0);
+var result = ko.observable(null)
+
+var loadPanelVisible = ko.observable(false);
+var URL_IP = ko.observable("192.168.1.22");
+var URL_DIR = ko.observable("NuvolarWCF");
+//var URL = ko.observable("http://"+URL_IP()+"/"+URL_DIR()+"/Service.svc/GetInfo?callback=?");
+var URL = ko.observable("http://localhost:49766/Service.svc/GetInfo?callback=?");
+var IsLoggedOn = false;
+
+var dxListDataSource;
+var dataSourcePDARows;
+var dataSourceDiscount;
+var ProductPicture;
+var simpleProducts;
+var JSON_Text;
+
+
+
+var Barcode = ko.observable("");
+var BarcodeProducts = ko.observable("");
+var BarcodeLocations = ko.observable("");
+var BarcodeDisabled = ko.observable(false);
+var QTT = ko.observable("1");
+var PriceBruttoHUF = ko.observable("0");
+var ActualDate = ko.observable(null);
+var ExpirationDate = ko.observable(null);
+
+var DiscountOkVisible = ko.observable(false);
+var DiscountCancelVisible = ko.observable(false);
+
+ActualDate = new Date(new Date().getTime() + (0 * 24 * 60 * 60 * 1000));
+ExpirationDate = new Date(new Date().getTime() + (3 * 24 * 60 * 60 * 1000));
+
+var currentnavigate = ko.observable("navigation");
+
+var SimpleQuery = {
+    "UserName": username,
+    "Password": password,
+    "Database": database,
+    "Query":query
+};
+
+var SimpleAnswer = {
+    "ResultStatus": resultstatus,
+    "Result": result
+};
+Date.prototype.yyyymmdd = function () {
+    var yyyy = this.getFullYear().toString();
+    var mm = (this.getMonth() + 1).toString(); // getMonth() is zero-based
+    var dd = this.getDate().toString();
+    return yyyy +'/'+ (mm[1] ? mm : "0" + mm[0]) +'/'+ (dd[1] ? dd : "0" + dd[0]); // padding
+};
+
+var navigation = [
+      {
+          title: "Termék információ",
+          onExecute: "#ProductsInfo",
+          icon: "product"
+      },
+      {
+          title: "PDA adatgyűjtés",
+          onExecute: "#StoragePDACollectionSelect",
+          icon: "todo",
+      },
+      {
+          title: "Névjegy",
+          onExecute: "#About",
+          icon: "info"
+      },
+      {
+          title: "Kijelentkezés",
+          onExecute: "#Login",
+          icon: "runner",
+          root: "true"
+      },
+      {
+          title: "Teszt",
+          onExecute: "#Test",
+          icon: ""
+      }
+];
+

Nuvolar.Scanner.Android.Shared/data/db.js

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+/// <reference path="../js/jquery-1.11.3.min.js" />
+/// <reference path="../js/knockout-3.3.0.js" />
+/// <reference path="../js/dx.all.js" />
+
+(function() {
+	var isWinJS = "WinJS" in window;
+    var endpointSelector = new DevExpress.EndpointSelector(Nuvolar_Scanner_Android.config.endpoints);
+    var serviceConfig = $.extend(true, {}, Nuvolar_Scanner_Android.config.services, {
+        db: {
+            url: endpointSelector.urlFor("db"),
+
+            // To enable JSONP support, uncomment the following line
+            //jsonp: !isWinJS,
+
+            // To allow cookies and HTTP authentication with CORS, uncomment the following line
+            // withCredentials: true,
+
+            errorHandler: handleServiceError
+        }
+    });
+
+    function handleServiceError(error) {
+        if(isWinJS) {
+            try {
+                new Windows.UI.Popups.MessageDialog(error.message).showAsync();
+            } catch(e) {
+                // Another dialog is shown
+            }
+        } else {
+            alert(error.message);
+        }
+    }
+
+    // Enable partial CORS support for IE < 10    
+    $.support.cors = true;
+    
+    Nuvolar_Scanner_Android.db = new DevExpress.data.ODataContext(serviceConfig.db);
+
+}());