title: Android Change Spinner theme/style with bottom border
body: <p>I have a spinner after i loaded data into it. the style is not as my expected.</p>
  
  <p>Spinner code</p>
  
  <pre><code>&lt;Spinner
                  android:layout_width="match_parent"
                  android:layout_height="wrap_content"
                  android:id="@+id/spinnerGender"
                  android:spinnerMode="dropdown"
                  android:layout_marginLeft="-5dp"
                  android:layout_marginTop="5dp"/&gt;
  </code></pre>
  
  <p>Current style.
  <a href="https://i.stack.imgur.com/Vsa4E.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Vsa4E.png" alt="enter image description here"></a></p>
  
  <p>My expected
  <a href="https://i.stack.imgur.com/YGniU.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/YGniU.png" alt="enter image description here"></a></p>
  
  <p>How can i change theme/style the spinner</p>