How do you know that the View was found and that the findViewById() method worked correctly?

Question

Android

How to find out what's working next. lines:

image0 = (ImageView) root_view.findViewById(R.id.image0);

that a value was actually added to the image0 variable, and is there any field on ImageVIew to understand that the variable is not empty?

Answer 1

if(image0 == null)//not found