title: Radio group onclick event not firing, how do I tell which is selected?
body: <p>I'm using radio group but <code>RadioGroup</code> <code>onClick</code> event is not firing and 
  the method <code>getCheckedRadiobuttonID()</code> is returning <code>null</code>. Here is the element in my <strong>layout:</strong></p>
  
  <pre><code>   &lt;RadioGroup
              android:id="@+id/RG1"
              android:layout_width="wrap_content"
              android:layout_height="wrap_content"
              android:orientation="horizontal"
              android:onClick="onRGClick" &gt;
  </code></pre>
  
  <p><strong>Method</strong></p>
  
  <pre><code>public void onRGClick(View v) {
      Toast.makeText(this, "Test ", 1000).show();
  }
  </code></pre>