title: KivyMD: MDDropDownItem not setting on Android; works on desktop
body: <p>I'm developping my first app in Kivy/KivyMD and I've run into the following problem:</p>
  <p>I've build my app using buildozer and when I open it on my android phone, the MDDropDownItem opens correctly, but doesn't set the new item (or even closes for that matter) when I tap it. It does work correctly on my desktop.</p>
  <p>Relevant code (main.py):</p>
  <pre><code>def __init__(self, **kwargs):
          super().__init__(**kwargs)
          self.screen = Builder.load_string('''
          
  &lt;ContentNavigationDrawer&gt;:
      orientation: 'vertical'
      padding: &quot;8dp&quot;
      spacing: &quot;8dp&quot;
  
      ScrollView:
          MDList:
              OneLineListItem:
                  text: 'Post Mortem Interval'
                  on_press:
                      root.nav_drawer.set_state('close')
                      root.screen_manager.current = 'Post Mortem Interval'
  Screen:
      BoxLayout:
          orientation: 'vertical'
  
          MDToolbar:
              id: toolbar
              pos_hint: {'top': 1}
              elevation: 10
              title: screen_manager.current
              left_action_items: [['menu', lambda x: nav_drawer.set_state('open')]]
  
          NavigationLayout:
              x: toolbar.height
  
              ScreenManager:
                  id: screen_manager
  
                  Screen:
                      name: 'Post Mortem Interval'
  
                      MDBottomNavigation:                    
                          MDBottomNavigationItem:
                              name: 'pmi'
  
                              MDTabs:
                                  id: tabs
  
                                  Tab:
                                      text: 'Calculate'
  
                                      MDDropDownItem:
                                          id: drop_item_cover
                                          pos_hint: {'center_x': .5, 'center_y': .57}
                                          text: 'cover'
                                          on_release: app.menu_cover.open()
  
                                      MDDropDownItem:
                                          id: drop_item_surFact
                                          pos_hint: {'center_x': .5, 'center_y': .47}
                                          text: 'factors'
                                          on_release: app.menu_surFact.open()
  ''')
  
         menu_items_cover = [{&quot;text&quot;: &quot;Naked&quot;}, 
                          {&quot;text&quot;: &quot;OneToTwoThicker&quot;},
                          {&quot;text&quot;: &quot;OneToTwoThin&quot;},
                          {&quot;text&quot;: &quot;TwoToThree&quot;},
                          {&quot;text&quot;: &quot;ThreeToFour&quot;},
                          {&quot;text&quot;: &quot;MoreLayers&quot;},
                          {&quot;text&quot;: &quot;BedspreadLight&quot;},
                          {&quot;text&quot;: &quot;BedspreadFully&quot;},
                          ]
  
          self.menu_cover = MDDropdownMenu(caller=self.screen.ids.drop_item_cover, items=menu_items_cover, position=&quot;center&quot;, width_mult=4)
          self.menu_cover.bind(on_release=self.set_item_cover)
  
  
          menu_items_surFact = [{&quot;text&quot;: &quot;StillAirBodyDry&quot;}, 
                          {&quot;text&quot;: &quot;MovingAirBodyDry&quot;},
                          {&quot;text&quot;: &quot;StillAirBodySoaked&quot;},
                          {&quot;text&quot;: &quot;MovingAirBodySoaked&quot;},
                          {&quot;text&quot;: &quot;StillWater&quot;},
                          {&quot;text&quot;: &quot;FlowingWater&quot;},
                          ]
  
          self.menu_surFact = MDDropdownMenu(caller=self.screen.ids.drop_item_surFact, items=menu_items_surFact, position=&quot;center&quot;, width_mult=7)
          self.menu_surFact.bind(on_release=self.set_item_surFact)
  
      def set_item_cover(self, instance_menu, instance_menu_item):
          self.screen.ids.drop_item_cover.set_item(instance_menu_item.text)
          self.menu_cover.dismiss()
          self.cover = instance_menu_item.text   #Retrieve the user input
          return self.cover                      #Retrieve the user input    
  
      def set_item_surFact(self, instance_menu, instance_menu_item):
          self.screen.ids.drop_item_surFact.set_item(instance_menu_item.text)
          self.menu_surFact.dismiss()
          self.surFact = instance_menu_item.text  #Retrieve the user input
          return self.surFact                     #Retrieve the user input
  </code></pre>