Retrieve text from edittext within tab to main activity

Question

I have an activity with a tabbed layout containing multiple different tabs. Each tab contains a number of 'edittext' fields. I have a button on the main activity and on clicking it i want to save the the contents of each edittext field from each tab. Currently i can return an ordinary value from the tab but i can not get the contents of the edittext field.

I have tried creating a 'lateinit var frag1_tenNo : EditText' within the fragment class for a tab. I have initialized it in the onCreateView but the program crashes saying 'lateinit property frag1_tenNo has not been initialized'

fragment code

class frag1: Fragment() {

   lateinit var frag1_tenNo : EditText

    override public fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
        val viewFrag1 = inflater.inflate(R.layout.frag1, container, false)
        frag1_tenNo = viewFrag1.findViewById(R.id.survey_tenantNo)
        return viewFrag1
    }

    fun saveFrag1Data(): String {
        var data1 = frag1_tenNo.text.toString()
        return data1
    }

activity code - to retrieve data

save_btn.setOnClickListener {
            Log.d("Survey","Change Button Clicked")
            val test = frag1().saveFrag1Data()
            Log.d("Survey","Returned value : $test")
        }

Answer 1

val test = frag1().saveFrag1Data() Here you create a new fragment. OnCreate method of this fragment isn't called yet. So quite predictably you get lateinit property frag1_tenNo has not been initialized error.