To add to what Enis recommended: A 48x48 pixel image will work well. Make your icon, Use Paint or another image creation tool. Save it as a png or jpg Place the icon (not a *.ico file) in resources on the
Designer screen . (see Media,
Upload File button). Once the icon is loaded, go to the Screen1 Properties on the
Design screen and click on the
Icon text box. When the form opens, select *.png (your icon) and press OK. You can also load the icon directly from the
Icon text box on the right of the Designer screen. When you compile the apk, the png file will be associated with your app.
Did that work OK for you. Please let us know. If that does not work, you might post a png/jpg image of your icon here. Your present icon might not be a png or jpg or it might be too large in size (Mb) or the image might be significantly larger than 48 x 48 pixels.
Regards,
Steve