OK, I thought you were referring to the native device gallery and misunderstood you.
That isn't our camera demo from the gallery
https://www.codenameone.com/demos.htmlHow are you capturing the image?
Notice that if an image exceeds a certain size in pixels some Android devices won't be able to show it "as is" which sometimes means a phone with a high res camera can't instantly show its captured images and needs to shrink them first.