updates.kt

var questionList: List<Question>? = null

  private fun observeQuestions() {
        questionsViewModel.getQuestions().observe(viewLifecycleOwner, Observer {
            //this code runs every time the data changes.
            questionList = it
            getNextQuestion()
        })
    }
    
private fun handleNext(){
        getNextQuestion()
        radioGroup.clearCheck()
        tv_wrong.visibility = View.INVISIBLE
        tv_correct.visibility = View.INVISIBLE
        questionsViewModel.setAnsweredState(AnsweredState.Answering)
    }

    private fun getNextQuestion() {
        if(questionsViewModel.currentQuestionIndex >= questionList?.size ?: 0) {
            questionsViewModel.currentQuestionIndex = 0
        }
        currentQuestion = questionList?.get(questionsViewModel.currentQuestionIndex++)  ?: return
        updateQuestion()
    }