Calling methods from other classes in Android

Question

I am trying to call a method from another class but I get an exception error.

I have two classes and class 1 is the main class

Class 1 has an onclick<

Answer 1

I know this is a little bit late, but having spent 2 full days to find a solution, this one definitely works for me, that could be useful to others:

1. Define the required function within first class (MainActivity which extends Activity) as a Static:

   public static int getScreenH(){
       Integer H = Sheight;
       return H;
   }
   

2. Then in the other class (class ResizeTextView extends TextView) call the function:

   Integer hh = MainActivity.getScreenH();
   

That's it!! The problem was that the calling class was an extension of TextView so none of the methods available within Activity could be used!