How to call a fragment’s method within an activity?

To invoke a method in a Fragment from an Activity, you can achieve it by following these steps:

1. To begin with, obtain an instance of the Fragment in Activity. This can be done by using the findFragmentById() or findFragmentByTag() methods of the FragmentManager. For example:

MyFragment fragment = (MyFragment) getSupportFragmentManager().findFragmentById(R.id.fragment_id);

1. Next, call the method of the Fragment. You can directly call the method of the Fragment instance to perform the corresponding operation. For example:

if (fragment != null) {
    fragment.someMethod();
}

1. If you need to pass parameters to a Fragment, you can do so when calling the method. For example:

if (fragment != null) {
    fragment.someMethodWithParams(param1, param2);
}

By following the steps above, it will be possible to call the methods of the Fragment in the Activity and achieve interaction between the Activity and the Fragment.