Why it says that “Cannot refer to a non-final variable I inside an inner class defined in a different method”?

When the onCreate() method returns, your local variable will be cleaned up from the stack, so they won't exist anymore. But the anonymous class object new View.OnClickListener() references these variables. Of cause it's wrong behavior so java don't allow you to do this.

Your anonymous inner class refers to its enclosing scope by taking copies of the local variables - if you want to change the value of an int in an anonymous inner class, you need to do some hackery.

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