how to enable particular radio button of radio group according to radio button id saved in shared preference in android studio -

i developing quiz app. in there 2 buttons previous question , next question.what want when user selects answer options (for options there 4 radio buttons) , attempts next question if user wants view previous question time same radio button should enabled ever selected user. used shared preferences storing selected radio button id. here code: next button click:

 nextbutton.setonclicklistener(new view.onclicklistener() {         @override         public void onclick(view view) {             int radioselected = radiogroup.getcheckedradiobuttonid();             int userselection = getselectedanswer(radioselected);              sharedpreferences=getsharedpreferences(mypreferences,mode_private);             sharedpreferences.editor editor=sharedpreferences.edit();             editor.putint("ans",userselection);             editor.commit();             int correctanswerforquestion =firstquestion.getcorrectanswer();             if(userselection == correctanswerforquestion)             {                 toast.maketext(getapplicationcontext(),"correct answer",toast.length_long).show();                 currentquizquestion++;                  if(currentquizquestion>=quizcount)                 {                     toast.maketext(getapplicationcontext(),"end of quiz",toast.length_long).show();                     return;                 }                 else                 {                     firstquestion=parsedobject.get(currentquizquestion);                     txtquestion.settext(firstquestion.getquestion());                     string[] possibleanswers=firstquestion.getanswers().split(",");                     uncheckedradiobutton();                     optionone.settext(possibleanswers[0]);                     optiontwo.settext(possibleanswers[1]);                     optionthree.settext(possibleanswers[2]);                     optionfour.settext(possibleanswers[3]);                 }             }             else             {                 toast.maketext(getapplicationcontext(),"you choose wrong answer",toast.length_long).show();                 currentquizquestion++;                 firstquestion=parsedobject.get(currentquizquestion);                 txtquestion.settext(firstquestion.getquestion());                 string[] possibleanswers=firstquestion.getanswers().split(",");                uncheckedradiobutton();                 optionone.settext(possibleanswers[0]);                 optiontwo.settext(possibleanswers[1]);                 optionthree.settext(possibleanswers[2]);                 optionfour.settext(possibleanswers[3]);             }         }     }); 

and previous button:

previousbutton.setonclicklistener(new view.onclicklistener() {         @override         public void onclick(view view) {              currentquizquestion--;             if(currentquizquestion<0)             {                 return;             }            checkedradiobutton();             firstquestion=parsedobject.get(currentquizquestion);             txtquestion.settext(firstquestion.getquestion());             string[] possibleanswers=firstquestion.getanswers().split(",");             optionone.settext(possibleanswers[0]);             optiontwo.settext(possibleanswers[1]);             optionthree.settext(possibleanswers[2]);             optionfour.settext(possibleanswers[3]);          }     });     json_data_web_call();  }  private void checkedradiobutton() {     int ans=1;     int ans1=sharedpreferences.getint("ans",ans);       if(optionone.getid()==ans1)    {          optionone.setchecked(true);       } } 

please me. lot.

add tag each radio button option optionone.settag("answer_tag", "one"). store selected tag, , compare radiobuttons.gettag("answer_tag) stored tag.