Android detect app closed with home button

app.js

Titanium.UI.setBackgroundColor('#000');

var tabGroup = Titanium.UI.createTabGroup();

var win1 = Titanium.UI.createWindow({  
    title:'Tab 1',
    url:'main.js'
});
var tab1 = Titanium.UI.createTab({  
    icon:'KS_nav_views.png',
    title:'Tab 1',
    window:win1
});

var win2 = Titanium.UI.createWindow({  
    title:'Tab 2',
    url:'main2.js'
});
var tab2 = Titanium.UI.createTab({  
    icon:'KS_nav_ui.png',
    title:'Tab 2',
    window:win2
});

tabGroup.addTab(tab1);  
tabGroup.addTab(tab2);  

tabGroup.open();
count = 0;


Ti.App.addEventListener('pause', function(){
    count-=1;
    Ti.API.info('Pause Event '+count);
        if(count<=0){
            // whatever you put here will fire when the app closes
            Ti.Android.currentActivity.finish();
        }
});

Ti.App.addEventListener('resume', function(){
    count+=1;
    Ti.API.info('Resume Event '+count);
});

main.js

var win = Ti.UI.currentWindow;

win.backgroundColor = 'red';

Ti.Android.currentActivity.addEventListener('pause', function(e){
    setTimeout(function(){Ti.App.fireEvent('pause');},500);
});

Ti.Android.currentActivity.addEventListener('resume', function(e){
    Ti.App.fireEvent('resume');
});

main2.js

var win = Ti.UI.currentWindow;

Ti.UI.currentWindow.backgroundColor = 'blue';

Ti.Android.currentActivity.addEventListener('pause', function(e){
      setTimeout(function(){Ti.App.fireEvent('pause');},500);
   
});

Ti.Android.currentActivity.addEventListener('resume', function(e){
   Ti.App.fireEvent('resume');
   
});

This doesn't work

this does not works

Please give me some hint on this,I really need help on this.
In my app I want to display one screen with password protection,when app goes in background and again in foreground then this password screen comes in picture and when user enter right password he is on screen from where app goes in background.
Thanks