title: Set color text RadioButton checked in RadioGroup with custom Shape
body: <p>I have a problem, I can't change text color to RadioButton if it's selected.
  I have this in  <strong>activity.xml</strong></p>
  
  <pre><code>&lt;RadioGroup
      android:id="@+id/activity_onsite"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_centerHorizontal="true"
      android:layout_centerVertical="true" &gt;
      &lt;RadioButton
          android:id="@+id/onsite_0"
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:checked="true"
          android:background="@drawable/toggle_btn"
          android:padding="10dp"
          android:text="office"
  
          android:button="@null"/&gt;
  
      &lt;RadioButton
          android:id="@+id/onsite_1"
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:background="@drawable/toggle_btn"
          android:text="clients"
          android:padding="10dp"
          android:button="@null"/&gt;
  &lt;/RadioGroup&gt;
  </code></pre>
  
  <p>in my resources <strong>@drawable/togglebtn</strong> I have</p>
  
  <pre><code>&lt;selector xmlns:android="http://schemas.android.com/apk/res/android"&gt;
     &lt;item android:drawable="@drawable/radio_btn_selected" android:state_checked="true" /&gt;
     &lt;item android:drawable="@drawable/radio_btn_regular"    android:state_checked="false"/&gt;
  &lt;/selector&gt;
  </code></pre>
  
  <p>And finally in my <strong>@drawable/radio_btn_selected</strong> </p>
  
  <pre><code>&lt;shape
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:shape="rectangle" &gt;
  &lt;corners
      android:radius="5dp" /&gt;
  &lt;solid
      android:color="#39b3d7"
  
      /&gt;
  &lt;stroke
      android:width="1dp"
      android:color="#269abc" /&gt;
  &lt;/shape&gt;
  </code></pre>
  
  <p>And in <strong>@drawable/radio_btn_regular</strong></p>
  
  <pre><code>&lt;shape
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:shape="rectangle" &gt;
  &lt;corners
      android:radius="5dp" /&gt;
  &lt;solid
      android:color="#fff"
  
       /&gt;
  &lt;stroke
      android:width="1dp"
      android:color="#269abc" /&gt;
  &lt;/shape&gt;
  </code></pre>
  
  <p>Can I change text color in radio_btn_selected.xml?</p>