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How to use the device screen size ?

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Hello everybody ! I'm just a new user of Titanium Studio, and I'm currently learning how to develop on Android. More, I'm sorry for my bad English (because I'm French !), and I hope I will be clear.

So, I just want to create a simple app, where I will display a penguin at the middle of the device screen. I want do to that for every kind of Android phone (for the moment). My objective in the future, is to create a similar app to "Flappy Bird".

I give you my code :

var screenHeight = Ti.Platform.displayCaps.platformHeight;
var screenWidth = Ti.Platform.displayCaps.platformWidth;
 
var win = Titanium.UI.createWindow({ 
    backgroundColor:'#fff',
    backgroundImage: 'images/background.jpg',
    orientationModes: [ Titanium.UI.PORTRAIT ], // UI restricted to portrait mode
    fullscreen: true,
    exitOnClose: true,
    navBarHidden: true
});
 
var penguin= Titanium.UI.createImageView({
    image: 'images/penguin.gif',
    bottom: screenHeight/2,
    left: screenWidth/2 
});
 
win.add(penguin);
win.open();

But with that code, my penguin is not on the device screen ! My background.jpg is 207x405 px and my penguin.gif is 45x35 px. Can you help me ? Thanks !


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