app.js

/**
 * Creates an image view using Google's QR Code generator.
 * @param text The text to be encoded in the QR code
 * @param size The size of the QR code; Possible Sizes: 100x100, 150x150, 200x200, 250x250, 300x300, 350x350, 400x400, 500x500
 */
function createQRCodeImageView(text, size) {
    var url = 'http://chart.apis.google.com/chart?cht=qr&chs=' + size + '&chl=' + encodeURI(text) + '&chld=H|0';
    var width = size.split('x')[0], height = size.split('x')[1];
    if (Ti.Android) {
        width += 'dp';
        height += 'dp';
    }
    return Ti.UI.createImageView({
        image: url, width: width, height: height
    });
}

var win = Ti.UI.createWindow({ backgroundColor: '#fff' });
win.add(createQRCodeImageView('Hello, world!', '150x150'));
win.open();