Below, a screenshot from my smartphone (Samsung Galaxy A5). You can see that the surface allowed to the camera is very tiny:
- should "Scan product's barcode and get its nutritional values" be on one line?
- should "Camera" and "History" button be smaller?
- could the app be in fullscreen?

Below, a screenshot from my smartphone (Samsung Galaxy A5). You can see that the surface allowed to the camera is very tiny: