Lock window screen in Portrait Android For Android Window screen lock, we need to set orientationModes and orientation property in the window object. we also need to make sure you force a heavyweight window by either setting fullscreen: true or navBarHidden: true.

app.js

    var win = Titanium.UI.createWindow({
	title : 'My app',
	backgroundColor : '#fff',
	navBarHidden : true,
	orientationModes : [Titanium.UI.PORTRAIT]
});
Titanium.UI.orientation = Titanium.UI.PORTRAIT;
 
var testButton = Ti.UI.createButton({
	title : 'Test Button',

});

 
testButton.addEventListener('click', function() {
	alert('\'Test Button\' was clicked!');
});

 
win.add(testButton);

win.open();