title: SAPUI5 this.getView in attachRequestCompleted
body: <p>I am loading data to my model and have a attachRequestCompleted attached. In there I want to set a value to one field, but it returns <em>this.getView is not a function.</em> This whole thing is inside a an interval:
  My code looks like this:</p>
  
  <pre><code>var intervalId = setInterval(this.readRfid.bind(this), 3000);
  
  readRfid: function() {
  
  var oRfidModel = new sap.ui.model.xml.XMLModel();
  
      oRfidModel.loadData("http://localhost/xxxxxxx");    
      oRfidModel.attachRequestCompleted(function() {
  
        var reader = oRfidModel.oData.children["0"].children["0"].innerHTML;    
        this.getView().byId("objHdr_det_id1").setNumberUnit(reader);
  });
  </code></pre>
  
  <p>Can I not use this.getView in the function? How can I make it work?
  Thanks,
  Tim</p>