title: change position of spinner dropdown list
body: <p>I need to change the horisontal position of Spinner's dropdown list. 
  here's the screenshot :</p>
  
  <p><img src="https://i.stack.imgur.com/P7TZB.png" alt="enter image description here"></p>
  
  <p>and I want this dropdown list to go in one line under the main icon/text so it would look fine</p>
  
  <p>As on the picture :</p>
  
  <p><img src="https://i.stack.imgur.com/Kg7fj.png" alt="enter image description here"></p>
  
  <p>here's what I do in xml :</p>
  
  <pre><code>&lt;Spinner
      android:id="@+id/tvHeader"
      style="@style/spinner_style"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_alignBottom="@+id/ver_main_donate_background_tile_long"
      android:layout_alignTop="@+id/ver_main_donate_background_tile_long"
      android:layout_marginTop="5dp"
      android:layout_toRightOf="@+id/icon_main_header"
      android:spinnerMode="dropdown"
      android:dropDownHorizontalOffset="-15dp"
      android:gravity="left|center_vertical"
  
      android:text="@string/name_of_product" /&gt;
  </code></pre>
  
  <p>so, as I suppose, </p>
  
  <pre><code>android:spinnerMode="dropdown"
  android:dropDownHorizontalOffset="-15dp"
  </code></pre>
  
  <p>should do the trick, but as you see on the screenshot it doesn't work</p>