Timothy King
Here is the .py file (sorry, you can't run the code because API key is needed):
from kivy.app import App
from kivy.lang import Builder
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.recycleview.views import RecycleDataViewBehavior
from kivy.uix.label import Label
from kivy.properties import BooleanProperty
from kivy.uix.recycleboxlayout import RecycleBoxLayout
from kivy.uix.behaviors import FocusBehavior
from kivy.uix.recycleview.layout import LayoutSelectionBehavior
from kivy.uix.screenmanager import ScreenManager, Screen
import config
from congress import Congress
class ListScreen(Screen):
   pass
class DetailScreen(Screen):
   pass
class ScreenManagement(ScreenManager):
   pass
class SelectableRecycleBoxLayout(FocusBehavior, LayoutSelectionBehavior,
                                RecycleBoxLayout):
   ''' Adds selection and focus behaviour to the view. '''
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class SelectableLabel(RecycleDataViewBehavior, Label):
   ''' Add selection support to the Label '''
   index = None
   selected = BooleanProperty(False)
   selectable = BooleanProperty(True)
   def refresh_view_attrs(self, rv, index, data):
       ''' Catch and handle the view changes '''
       self.index = index
       return super(SelectableLabel, self).refresh_view_attrs(
           rv, index, data)
   def on_touch_down(self, touch):
       ''' Add selection on touch down '''
       if super(SelectableLabel, self).on_touch_down(touch):
           return True
       if self.collide_point(*touch.pos) and self.selectable:
           return self.parent.select_with_touch(self.index, touch)
   def apply_selection(self, rv, index, is_selected):
       ''' Respond to the selection of items in the view. '''
       self.selected = is_selected
       if is_selected:
           print("selection changed to {0}".format(rv.data[index]))
       else:
           print("selection removed for {0}".format(rv.data[index]))
class OpenCongress(BoxLayout):
   API_KEY = config.APP_CONFIG['api_key']
   dictSenate = {}
   dictHouse = {}
   def __init__(self, **kwargs):
       # super(OpenCongress, self).__init__(**kwargs)
       super().__init__()
       self.congress = Congress(self.API_KEY)
       self.getChamberList('senate')
       self.getChamberList('house')
   def getChamberList(self, chamber):
       all_members = self.congress.members.filter(chamber)
       # print (all_members)
       num_results = int(all_members[0]['num_results'])
       member_list = all_members[0]['members']
       i = 0
       while i < num_results:
           first_name = member_list[i]['first_name']
           last_name = member_list[i]['last_name']
           state = member_list[i]['state']
           party = member_list[i]['party']
           memberLine = str.format('%s %s (%s) %s' % (first_name, last_name, party, state))
           if chamber == 'senate':
               self.dictSenate[i] = member_list[i]['id']
               self.rv.data.append({'text': memberLine})
           else:
               self.dictHouse[i] = member_list[i]['id']
               self.rv2.data.append({'text': memberLine})
           i += 1
class OpenCongressApp(App):
   def build(self):
       return ScreenManagement()
if __name__ == '__main__':
   OpenCongressApp().run()
#:kivy 1.0.9
<ScreenManagement>:
   ListScreen:
       name: 'list'
   DetailScreen:
       name: 'detail'
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<ListScreen>:
   OpenCongress:
<DetailScreen>:
   BoxLayout:
       Button:
           text: 'Go To Main'
           on_press: app.root.current = 'list'
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<SelectableLabel>:
   canvas.before:
       Color:
           rgba: (128, 0, 128, .1) if self.selected else (128, 128, 128, .3)
       Rectangle:
           size: self.size
           pos: self.pos
   value: ''
   Label:
       text: root.value
<OpenCongress>:
   rv: rv
   rv2: rv2
   orientation: 'vertical'
   BoxLayout:
       orientation: 'horizontal'
       height: dp(30)
       size_hint_y: None
       rows: 1
       TextInput:
           id: search_chamber
           height: dp(30)
           hint_text: 'Search'
           multiline: False
           padding: dp(5), dp(5), 0, 0
   TabbedPanel:
       do_default_tab: False
       TabbedPanelItem:
           text:"Senate"
           RecycleView:
               id: rv
               scroll_type: ['bars', 'content']
               scroll_wheel_distance: dp(128)
               bar_width: dp(10)
               viewclass: 'SelectableLabel'
               SelectableRecycleBoxLayout:
                   default_size: None, dp(56)
                   default_size_hint: 1, None
                   size_hint_y: None
                   height: self.minimum_height
                   orientation: 'vertical'
                   spacing: dp(2)
       TabbedPanelItem:
           text:"House"
           RecycleView:
               id: rv2
               scroll_type: ['bars', 'content']
               scroll_wheel_distance: dp(128)
               bar_width: dp(10)
               viewclass: 'SelectableLabel'
               SelectableRecycleBoxLayout:
                   default_size: None, dp(56)
                   default_size_hint: 1, None
                   size_hint_y: None
                   height: self.minimum_height
                   orientation: 'vertical'
                   spacing: dp(2)
   Button:
       text: 'Go To Detail'
       size_hint_y: None
       on_press: app.root.current = 'detail'
        Â
Elliot Garbus
On Dec 31, 2019, at 6:57 PM, Timothy King <timc...@gmail.com> wrote:

I'm trying to create an app with 2 screens. The "list" screen shows Congress members in a tabbed panel and the "details" screen will show information about the selected member. When I run the app, I get a duplicate "list" screen like so:
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<Screenshot from 2019-12-31 17-43-53.png>
Timothy King
Elliot Garbus
The core issue is you are automatically pulling in the kv file – because it matches the name of the App, and you are instancing the app in the return from build.
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I recommend, not returning anything from build() and instance your layout in the kv file.
This me create a root widget in the kv file, not just rules.
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At the bottom of your kv file simply add:
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ScreenManagement:
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This will instance the screen.
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Timothy King
class OpenCongressApp(App):
  def build(self):
    return OpenCongress()
To:
class OpenCongressApp(App):
  pass
On Tuesday, December 31, 2019 at 5:57:06 PM UTC-8, Timothy King wrote:
Elliot Garbus
On Jan 1, 2020, at 5:10 PM, Timothy King <timc...@gmail.com> wrote:

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Elliot Garbus
class OpenCongress(BoxLayout):
...
def __init__(self, **kwargs):
# super(OpenCongress, self).__init__(**kwargs)
super().__init__(**kwargs) # ***** **kwargs was missing *************
# self.getChamberList('senate')
# self.getChamberList('house')
# ***** rv is not yet initialized at initialization, called at on_start()
Timothy King
On Tuesday, December 31, 2019 at 5:57:06 PM UTC-8, Timothy King wrote: