<ViewGroup.addview() is working but child view is ...

# stackoverflow

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ViewGroup.addview() is working but child view is not showing
I develop an android app. I want to add TextView(s) to a LinearLayout dynamically. No error occurred but TextView is not showing. I thought sleep_records_container' height might be 0dp and I tried to set 300dp but nothing showed in this container. How do I solve this problem?
Below Fragment is aim to show sleep records in one month.
SleepRecordFragment.kt
class SleepRecordFragment: Fragment() {
@SuppressLint("SimpleDateFormat")
override fun onCreateView(
inflater:...