The common way for a fragment to talk to its attached activity is via an interface. However, can we use the instance of the activity in that fragment?
For instance, we have a function named helloWorld() in MainActivity. And the MainActivity has a fragment called MainFragment. if I want to call the helloWorld() in MainFragment, I can get the instance of the MainActivity using (activity as MainActivity). Then, i can use this instance to invoke helloWorld.
So, it this a feasible way to achieve the communication; And also, it is a good way, or we still need to create an interface within the fragment and let the activity to implement that interface?
That works perfectly fine as long as you guarantee that your fragment is only ever used by that activity.