How to override a class within an Android library project?

Question

The following is my situation:

I have a library project and a project based on it. Now in the library I have two classes A and B, whereby A uses B. In the project

Answer 1

I dont know if this is the best way to do it but i do it this way;

I create a class A from the project and this class extends form the library project

public class A extends libraryProject_A{

//here i put all methods from the new class B to override methods from library class B

}