Android Studio - How to extend 2 Classes

1) You cannot extend two classes, for such function you should try using interfaces and implement them. Each interface can in turn extend one class for itself.

2) You cannot inherit booleans, boolean is a type, primitive type.

Instead, you should try instantiating and using the boolean variable, or make it static and call it as,

MainActivity.variable

For this reason, multilevel inheritance has been introduced so that you can use features of 2 or more classes. http://beginnersbook.com/2013/05/java-inheritance-types/[^]

// Example of "what I am saying"
class First {
   // members and functions of First class
}

class Second extends First {
   // members and functions of First and Second class
}

class Third extends Second {
   // members and functions of First, Second and Third class
}

You can use Third and call functions and members inherited from First and Second class also. Even boolean.