title: How can I uncheck or reset the radio button?
body: <p>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?</p>
  <pre><code>  answ1=new ArrayList&lt;String&gt;(new ArrayList&lt;String&gt;(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
                }
               });
  </code></pre>
  <p>Logcat</p>
  <pre><code>     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)
  
                   
  </code></pre>
  <p>I try like this, but I can't uncheck..</p>