Proper way to handle Android Studio's NullPointerException lint warning

Question

I\'m new to android/java programming and am confused how to properly deal with this warning.

Method invocation \'\' may produce \'Java.lang.NullPointe

Answer 1

As @matiash pointed out there is no one-size-fits-all solution.

For me a good compromise was to disable NullPointerException warning for all calls to findViewById() and keep it for other method calls. That way I take responsibility for checking the resource ids but still get a benefit of getting warnings if I make other mistakes.

To achieve this I added _ -> !null method contract with Android Studio quick fix menu.

The action generated a following file file at android/support/v7/app/annotations.xml in my project root.

Update: Unfortunately it doesn't survive Android Studio restarts :-( External annotations are really useful so I hope I'll figure out a way to make Android Studio load them after restart.