Titanium Back Button - Always closes my App

Question

I have a new problem with my App, i'm using Appcelerator Titanium for development. I want to lock the Backbutton from my Device, so the App wont close everytime when i use him. I want to close the App only if i'm at the primarymenu. So this is my code:

Ti.UI.currentWindow.addEventListener('android:back',function(){
alert(Ti.App.PositionNow);
if(Ti.App.PositionNow=='0') {
    alert('do quit');
} else if(Ti.App.PositionNow=='1') {
    Ti.App.multi_tableView.addEventListener('click',myfunction);
    var duration = 300;
    var setOldOpacity = Titanium.UI.createAnimation();
    setOldOpacity.opacity = 1;
    setOldOpacity.zIndex = 1;
    setOldOpacity.duration = duration;

    var setOldBottom = Titanium.UI.createAnimation();
    setOldBottom.bottom = 0;
    setOldBottom.duration = duration;

    var setOldTop = Titanium.UI.createAnimation();
    setOldTop.top = 0;
    setOldTop.duration = duration;

    var animationHandler2 = function() {
           setOldTop.removeEventListener('complete',animationHandler2);
           Ti.App.multi_view_first.animate(setOldTop);
           Ti.App.multi_view_second.animate(setOldBottom);
           Ti.App.multi_tableView.animate(setOldOpacity);
        };
    setOldTop.addEventListener('complete',animationHandler2);
    Ti.App.multi_view_first.animate(setOldTop);
    Ti.App.multi_view_second.animate(setOldBottom);
    Ti.App.multi_tableView.animate(setOldOpacity);
    alert('hallo1');
    Ti.App.PositionNow = 0;
}
return false;
});

I have an variable where i track the position from the user at the hierachy from the menu. So the App should only close when the position is "0".

If the position is "1", there should be an animation, so this works, but during the animation, the app closes instantly.

The code of the window is this:

Ti.App.hs_win = Ti.UI.createWindow({
   url: '/sites/homescreen/index.js',
   navBarHidden: true,
   fullscreen: true,
   modal:true,
   theme: "Theme.Titanium",
   orientationModes: [Ti.UI.PORTRAIT]
});

Answer 1

The event you're monitoring android:back is deprecated. Please use androidback event.

The second step is to stop the event bubbling further in the event handler chain. For this you need to cancel the event:

Ti.UI.currentWindow.addEventListener('androidback',function(event){
      event.cancelBubble = true;
}

Also you have to modify your window and set exitOnClose property to false