How can I uncheck or reset the radio button?

Question

I am developing an quiz based app. There will be 1 question and 4 option (radio buttons) when user opens this app radio button will be unchecked but the problem comes when the user answers 1 quest and when he goes for next quest radio button will be checked. I want to uncheck/reset the radio buttons for every question. How can I do it?

  answ1=new ArrayList<String>(new ArrayList<String>(answ1));         btn_practice1.setText(answ1.get(0));         btn_practice2.setText(answ1.get(1));         btn_practice3.setText(answ1.get(2));         btn_practice4.setText(answ1.get(3));         btn_practicerg.setOnCheckedChangeListener(new OnCheckedChangeListener(){             @Override             public void onCheckedChanged(RadioGroup group, int checkedId) {                              RadioButton radioButton = (RadioButton)group. findViewById(checkedId); //line 262                 String temp = radioButton.getText().toString();                 switch(btn_practicerg.getCheckedRadioButtonId()){                 case R.id.RB1:                     if (btn_practice1.isChecked()){                         btn_practice2.setChecked(false);                         btn_practice3.setChecked(false);                         btn_practice4.setChecked(false);                     }                    break;                 case R.id.RB2:                     if (btn_practice2.isChecked()){                         btn_practice1.setChecked(false);                         btn_practice3.setChecked(false);                         btn_practice4.setChecked(false);                     }                                         break;                 case R.id.RB3:                     if (btn_practice3.isChecked()){                         btn_practice1.setChecked(false);                         btn_practice2.setChecked(false);                         btn_practice4.setChecked(false);                     }                     break;                 case R.id.RB4:                     if (btn_practice4.isChecked()){                         btn_practice1.setChecked(false);                         btn_practice2.setChecked(false);                         btn_practice3.setChecked(false);                     }                                        break;                 default:                     btn_practice1.setChecked(false);                     btn_practice2.setChecked(false);                     btn_practice3.setChecked(false);                     btn_practice4.setChecked(false);                 }           ImageView nextBtn = (ImageView) findViewById(R.id.nxt_btn);     nextBtn.setOnClickListener(new Button.OnClickListener(){     public void onClick(View v){          btn_practicerg.clearCheck();  //line 355               }              }); 

Logcat

     E/AndroidRuntime(729):at           com.example.TEENEINSTIEN.Question$LoadQuestions$2.onCheckedChanged(Question.java:262)       E/AndroidRuntime(729):at android.widget.RadioGroup.setCheckedId(RadioGroup.java:172)       E/AndroidRuntime(729):at android.widget.RadioGroup.check(RadioGroup.java:166)       E/AndroidRuntime(729):at android.widget.RadioGroup.clearCheck(RadioGroup.java:205)       E/AndroidRuntime(729):at          com.example.TEENEINSTIEN.Question$LoadQuestions$3.onClick(Question.java:355)       E/AndroidRuntime(729):at android.view.View.performClick(View.java:2485)       E/AndroidRuntime(729):at android.view.View$PerformClick.run(View.java:9080)                    

I try like this, but I can't uncheck..

Answer 1

Put all your buttons in a RadioGroup then when you need to clear them all use RadioGroup.clearCheck();