How to access parent Activity View in Fragment

Question

I have an ActionBarActivity and fragment. I am using FragmentPagerAdapter that provides fragment to my app. My question How can I access parent Activit

Answer 1

Note that if you are using findViewById<>() from activity, it wont work if you call it from fragment. You need to assign the view to variable. Here is my case

This doesn't work

class MainActivity{

    fun onCreate(...){
        //works
        setMyText("Set from mainActivity")
    }

    fun setMyText(s: String){
        findViewById(R.id.myText).text = s
    }
}
________________________________________________________________

class ProfileFragment{
    ...

    fun fetchData(){
        // doesn't work
        (activity as MainActivity).setMyText("Set from profileFragment")
    }
}

This works

class MainActivity{

    private lateinit var myText: TextView

    fun onCreate(...){
        myText = findViewById(R.id.myText)

        // works
        setMyText("Set from mainActivity")
    }

    fun setMyText(s: String){
        myText.text = s
    }
}
________________________________________________________________

class ProfileFragment{
    ...

    fun fetchData(){
        // works
        (activity as MainActivity).setMyText("Set from profileFragment")
    }
}