Android Programming: The Big Nerd Ranch Guide, Third Edition

Creating a Comparable Experience

You should specify a content description for any UI widget that provides information to the user but does not use text to do it (such as an image). If there is a widget that does not provide any value other than decoration, you should explicitly tell TalkBack to ignore it by setting its content description to null.

You might think, “If a user cannot see, why does he or she need to know whether there is an image?” But you should not make assumptions about your users. More importantly, you should make sure a user with a visual impairment gets the same amount of information and functionality as a user without one. The overall experience and flow may be different, but all users should be able to get the ...