What you have here is a non-local variable (https://en.wikipedia.org/wiki/Non-local_variable), i.e. you access a local variable in a method an anonymous class.
Local variables of the method are kept on the stack and lost as soon as the method ends, however even after the method ends, the local inner class object is still alive on the heap and will need to access this variable (here, when an action is performed).
I would suggest two workarounds :
Either you make your own class that implements actionlistenner and takes as constructor argument, your variable and keeps it as an class attribute. Therefore you would only access this variable within the same object.
Or (and this is probably the best solution) just qualify a copy of the variable final to access it in the inner scope as the error suggests to make it a constant:
This would suit your case since you are not modifying the value of the variable.