Hide Title bar and action bar, i.e. full screen in Android

Option 1: use theme properties to override default

var win = Ti.UI.createWindow({theme:Theme.AppCompat.Fullscreen});

More theme properties:
http://docs.appcelerator.com/platform/latest/#!/guide/Android_Themes

Option 2: Use custom theme to control

http://developer.appcelerator.com/question/181847/hide-title-bar-in-android-titanium#286897

Add customtheme.xml in platform/android/res/values

and edit AndroidManifest.xml to use the custom theme defined.