[TIMOB-11602] Android: Expose activity.invalidateOptionsMenu to allow changing action items in Android 3.0 and above

       <android xmlns:android="http://schemas.android.com/apk/res/android">
           <manifest>
               <uses-sdk android:minSdkVersion="8" android:targetSdkVersion="14"/>
           </manifest>
       </android>
   

   var win = Ti.UI.createWindow({
   	fullscreen : true
   });
   var LOGIN = 1, LOGOUT = 2;
   var loggedIn = false;
   
   var activity = win.activity;
   
   activity.onCreateOptionsMenu = function(e) {
   	var menu = e.menu;
   	var login = menu.add({
   		title : "Login",
   		itemId : LOGIN
   	});
   	login.setIcon("login.png");
   	login.addEventListener("click", function(e) {
   		loggedIn = true;
   		win.activity.invalidateOptionsMenu();
   	});
   	login.showAsAction = Ti.Android.SHOW_AS_ACTION_ALWAYS;
   	var logout = menu.add({
   		title : "Logout",
   		itemId : LOGOUT
   	});
   	logout.setIcon("logout.png");
   
   	logout.addEventListener("click", function(e) {
   		loggedIn = false;
   		win.activity.invalidateOptionsMenu();
   	}); 
   
   	logout.showAsAction = Ti.Android.SHOW_AS_ACTION_ALWAYS;
   };
   
   activity.onPrepareOptionsMenu = function(e) {
   	var menu = e.menu;
   	menu.findItem(LOGIN).setVisible(!loggedIn);
   	menu.findItem(LOGOUT).setVisible(loggedIn);
   };
   
   win.addEventListener('click', function(){
   	win.activity.openOptionsMenu();
   });
   
   win.open();