[TIMOB-8889] Android: android:back event does not get fired from activity indicator

Ti.UI.backgroundColor = 'white';

var win1 = Ti.UI.createWindow({
  backgroundColor: 'blue'
});

var win2 = Ti.UI.createWindow({
  backgroundColor: 'yellow',
  fullscreen: true
});

var activityIndicator = Ti.UI.createActivityIndicator({
  color: 'green',
  font: {fontFamily:'Helvetica Neue', fontSize:26, fontWeight:'bold'},
  message: 'Loading...',
  style:Ti.UI.iPhone.ActivityIndicatorStyle.DARK,
  top:10,
  left:10,
  height:'auto',
  width:'auto'
});

// On iOS, the activity indicator must be added to a window or view for it to appear
if (Ti.Platform.name === 'iPhone OS'){
  win2.add(activityIndicator);
}

// eventListeners must always be loaded before the event is likely to fire
// hence, the open() method must be positioned before the window is opened
win2.addEventListener('open', function (e) {
  activityIndicator.show();
  // do some work that takes 6 seconds
  // ie. replace the following setTimeout block with your code
  setTimeout(function(){
    win2.close();
    activityIndicator.hide();
  }, 6000);
});

activityIndicator.addEventListener('android:back', function(){
	Ti.API.info('back!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!');
});

win1.open();
win2.open();