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

As I see from your comment you have class A that uses class B

But class B should be different according to which project you're using.

I think you need to create a base class say BaseB that will be an instance variable in class A, and you might have a setter and getter for this Or you can make it a parameter passed to the constructor of class A. and when instantiating A you should choose which one to use.

Let's have a look at code

Class A {
 private BaseB b;
 public A(BaseB aB) {
   b = aB;
 }

 public void set(BaseB aB) {
  b = aB;
 }
 public BaseB get() {
   return b;
 }
}

interface BaseB {
}


// in the library have this
class B implements BaseB {
}

// in your project have the other implementation
class B implements BaseB {
}

// you can then instantiate A like this
A a = new A(new B());
// you can choose which one to use here in the previous statement.