is this Class diagram correct?what it mean

Question

I am starting a project creating a digital ordering using android. I have created a simple class diagram as you can see below. I just wanted some guidance on whether the relationships are correct for the entities?

Answer 1

This diagram is syntactically correct, as depepdencies are perfectly valid between two classes.

This diagrams shows that the class MainActivity uses other two classes, but does not have tham as data members. The typicall scenario modelled this way is that they are passed as parameters to a method of the class MainActivity or are instantiated within its method(s).

If this is what you wanted to show, the diagram is also semantically correct.