title: Using @OnCheckedChanged (ButterKnife) with radioGroup gives error in android
body: <p>i recently integrated butterknife in my android project, and now i am trying to use @OnCheckedChanged annotation for radiogroup. but getting error of not giving callback. So what is the right method to call and get checkedId or this one is for radiobutton only and not for radiogroup.</p>
  
  <pre><code>@OnCheckedChanged(R.id.gendergroupid)
  void onGenderSelected(RadioGroup group, int checkedId){
      switch(checkedId){
          case R.id.maleid:
              maleid.setEnabled(true);
              maleid.setChecked(true);
              break;
          case R.id.femaleid:
              femaleid.setEnabled(true);
              femaleid.setChecked(true);
              break;
          case R.id.bothid:
              bothid.setEnabled(true);
              bothid.setChecked(true);
              break;
      }
  }
  </code></pre>
  
  <p>Gives me error </p>
  
  <blockquote>
    <p>BloError:(89, 10) error: Unable to match @OnCheckedChanged method arguments. </p>
  </blockquote>
  
  <p>Parameter #1: android.widget.RadioGroup
  did not match any listener parameters</p>
  
  <p>Parameter #2: int
  did not match any listener parameters</p>
  
  <p>Methods may have up to 2 parameter(s):</p>
  
  <p>android.widget.CompoundButton
  boolean</p>
  
  <p>These may be listed in any order but will be searched for from top to bottom.ckquote</p>