title: How to add item number on the cart icon at top toolbar? Android
body: <p>I saw some apps made it. So I am intersting at how to do it. I believe there must be some trick way to do it. Example:<a href="https://i.stack.imgur.com/SQz4r.jpg" rel="noreferrer"><img src="https://i.stack.imgur.com/SQz4r.jpg" alt="enter image description here"></a></p>
  
  <p>I add the cart icon in the menu file.
  `</p>
  
  <pre><code>&lt;item
      android:id="@+id/action_drawer_search"
      android:orderInCategory="300"
      android:title="Search"
      android:icon="@drawable/ic_search_white_24dp"
      app:showAsAction="ifRoom"
      /&gt;
  &lt;item
      android:id="@+id/action_drawer_cart"
      android:orderInCategory="200"
      android:title="Cart"
      android:icon="@drawable/ic_shopping_cart_white_24dp"
      app:showAsAction="ifRoom"/&gt;
  </code></pre>
  
  <p>
  `</p>
  
  <p><a href="https://i.stack.imgur.com/s0UKp.jpg" rel="noreferrer"><img src="https://i.stack.imgur.com/s0UKp.jpg" alt="enter image description here"></a></p>