Fragment not attached to a context

Question

In activity in Toolbar I got a button which need to call method from fragment and update list in that fragment. Now it is an error. Calling in activity

@Over         


        

Answer 1

Create a fragment instance is not enough.
It needs to be attached to Activity through a transaction:

getFragmentManager()
    .beginTransaction()
    .replace(R.id.container_layout, fragment)
    .commit();

After a successful commit, onAttach method in the fragment is called, the view is created and then you can interact with its views.

In your case, create the fragment instance and attach it in activity onCreate, then call sortByPopularity later in a click event.

Read more about fragment life cycle: https://developer.android.com/guide/components/fragments