Randomize radio button in android [duplicate]

This question already has an answer here:

• How to shuffle an ArrayList [duplicate] 2 answers

I want to randomize the radio button. In my radio button 4 options are there choice1 choice2 choice3 and the answer by default I have set the answer as fix now, I want to shuffle so it will check directly and can calculate score

Here is the code what I have done till now. Radio button values are getting randomize not radio button. All 4 radio button are in radio group Suggest some solution or any other idea

Code

            choice1 =(exp.getString("choice1")); 
            choice2 =(exp.getString("choice2")); 
            choice3 =(exp.getString("choice3")); 
            answer =(exp.getString("answer")); 

            ropt0.setText("" + choice1); 
            ropt1.setText("" + choice2); 
            ropt2.setText("" + choice3); 
            ranswer.setText("" + answer);

            ArrayList<String> arrayText = new ArrayList<>(); 

            arrayText.add(choice1); 
            arrayText.add(choice2); 
            arrayText.add(choice3); 
            arrayText.add(answer); 

            Collections.shuffle(arrayText);

            for (int j = 0; j < rdgrp.getChildCount(); j++) { 
                RadioButton rb = (RadioButton) rdgrp.getChildAt(j); 
                rb.setText(arrayText.get(j)); 
                }