Android Lint: mark variables as final whenever applicable in Java

Question

Is there any Lint check to enforce declaring every variable (local or class), parameter final if they really are?

Answer 1

No there's no check for that. Checkstyle or PMD can do this for you. Note that both won't work with Kotlin though.

• Checkstyle FinalLocalVariableCheck
• Checkstyle LocalFinalVariableNameCheck
• more in config_misc
• PMD MethodArgumentCouldBeFinal
• PMD LocalVariableCouldBeFinal

You could also write your own lint check for that. I've written a blog post about it that goes into detail - https://medium.com/@vanniktech/writing-your-first-lint-check-39ad0e90b9e6