how to change fragment views programmatically from the parent activity

Question

I am having a fragment that contains for example one button, I want to allow the Activity containing the fragment to change this button view like for example color and title or

Answer 1

1. You must get you fragment from your activity

val fragment = supportFragmentManager.findFragmentByTag("tag")

or

val fragment = supportFragmentManager.findFragmentById(R.id.fragment)

2. Create a method that will do what you wants in you fragment and call this method from the activity

fragment.hideButton()

or you can use interface