title: Osmdroid: show and hide markers description on click
body: <p>I am programming an app in Java using Android Studio.
  I already displayed a map using osmdroid, added some overlays to display markers on special locations and added a title &amp; a description to the markers.</p>
  
  <p>Now I display the title &amp; description of the marker on click using the setFocusItemsOnTap method.
  My problem is that I am not able to hide the title &amp; description of the marker on a second click (so if its already shown). Is there any way to do this?</p>
  
  <p>Or if thats not possible is there a way to only display the title &amp; description of one marker at once using the setFocusItemsOnTab methode? </p>
  
  <pre><code>public static List&lt;OverlayItem&gt; items = new ArrayList&lt;OverlayItem&gt;();
  
  //[...]
  
  items.add(new OverlayItem("uid1","Title", "Description", new GeoPoint(51.398,6.875)));
  
  //[...]
  
  List&lt;OverlayItem&gt; currentList;
  currentList = new ArrayList&lt;OverlayItem&gt;();
          currentList.add(items.get(i));
  
  //[...]
  
  final ItemizedOverlayWithFocus&lt;OverlayItem&gt; mOverlay = new ItemizedOverlayWithFocus&lt;OverlayItem&gt;(this, currentList, new ItemizedIconOverlay.OnItemGestureListener&lt;OverlayItem&gt;() {
                  @Override
                  public boolean onItemSingleTapUp(final int index, final OverlayItem item) {
                      //here it should decide if the title &amp; description is already shown or not. (true =&gt; hide it, false =&gt; display it)
                      return true;
                  }
                  @Override
                  public boolean onItemLongPress(final int index, final OverlayItem item) {
                      return false;
                  }
          });
  
  mOverlay.setFocusItemsOnTap(true);
  </code></pre>
  
  <p>I have to use these parts of the code, because i wanted to add different markers and i wanted to be able to focus all of them. Also i need to be able to add them to a dynamic list during runtime.</p>
  
  <p>Thanks for your help!</p>