title: android center align the selected tab in tablayout
body: <p>I am using android support design tablayout. Here's my code:</p>
  
  <pre><code>    &lt;android.support.design.widget.TabLayout
          android:id="@+id/tabs"
          android:layout_width="match_parent"
          android:layout_height="wrap_content""
          app:tabGravity="center"
          app:tabMode="scrollable"
          /&gt;
  
      &lt;android.support.v4.view.ViewPager
          android:id="@+id/view_pager"
          android:layout_width="match_parent"
          android:layout_height="match_parent"
          /&gt;
  </code></pre>
  
  <p>My issue is the tabs always align left. However, I would like to center the selected tab (even at the beginning, the first(selected) tab should be centered). Is there a way to do this? Thanks.</p>