title: Add external components in the constraintLayout
body: <p>How can we add components from external libraries directly in the android studio layout designer and constraint them?</p>
  
  <p>Example:<br>
  This is not provided as a component you can drag to the design editor</p>
  
  <pre><code>&lt;com.facebook.login.widget.LoginButton
   android:id=”@+id/login_button”
   android:layout_width=”wrap_content”
   android:layout_height=”wrap_content”
    /&gt;
  </code></pre>