title: Android radio button is ckecked but does not show it
body: <p>I have 2 static radio buttons in radio group in xml like this:</p>
  
  <pre><code> &lt;RadioGroup
      android:id="@id/rdg_feed_event"
      android:layout_width="200dp"
      android:layout_height="wrap_content"
      android:layout_alignBottom="@id/txt_feed_calendar"
      android:layout_centerHorizontal="true"
      **android:checkedButton="@id/rdb_feed_event"**
      android:background="@drawable/radio_group_title"
      android:divider="@drawable/divider_title"
      android:orientation="horizontal"
      android:showDividers="middle"&gt;
  
      &lt;RadioButton
          android:id="@id/rdb_feed_event"
          style="@style/Theme.RadioButton"
          android:background="@drawable/radio_btn_left_title"
          android:fontFamily="@string/font_family_normal"
          android:text="@string/feed_event"
          android:textColor="@drawable/radio_btn_text_gray_black"/&gt;
  
      &lt;RadioButton
          android:id="@id/rdb_feed_event_my"
          style="@style/Theme.RadioButton"
          android:background="@drawable/radio_btn_right_title"
          android:fontFamily="@string/font_family_normal"
          android:text="@string/feed_event_my"
          android:textColor="@drawable/radio_btn_text_gray_black"/&gt;
  &lt;/RadioGroup&gt;
  </code></pre>
  
  <p>This all is set to fragment in its onCreateView:</p>
  
  <pre><code>@Override
  public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
      final View view = super.onCreateView(inflater, container, savedInstanceState);
  
      mRdbEvent = (RadioButton) view.findViewById(R.id.rdb_feed_event);
      mRdbEventMy = (RadioButton) view.findViewById(R.id.rdb_feed_event_my);
      mRdgEvent = (RadioGroup) view.findViewById(R.id.rdg_feed_event);
    ..
  </code></pre>
  
  <p>When I firstly load app - the button "events" is checked and its shown in view and the expression <code>mRdgEvent.getCheckedRadioButtonId() == mRdbEvent.getId()</code> returns <code>true</code>. Then I tap on the second radio button and after that I tap to other menu which leads to another fragment(with FragmentTransaction.replace). After that I return to first fragment - again its <code>onCreateView</code> method is launched and again  <code>mRdgEvent.getCheckedRadioButtonId() == mRdbEvent.getId()</code> in <code>onCreateView</code> returns <code>true</code>. But for this time the second radio button in view is checked, not the first. But the code shows true that the 1 one is checked - as it is declared in xml to be checked by default. How this can be? Thx in advance. </p>