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Add widget dynamically from outside class (error)

I´m learning kivy, and it has passed 3 weeks since i face this problem without encounter a solution, so i hope any of u guys could help me, i would appreciate it.
I have a main file:
from app import MyProgramApp
if __name__ == "__main__":
winapp = MyProgramApp()
winapp.run()
from where i start my app. Then i have a directory called "app", inside there is the following "init.py" file.
from kivy.app import App
from kivy.utils import QueryDict, rgba
from kivy.core.window import Window
from .view import MainWindow
Window.minimum_width = 500
Window.minimum_height = 650
Window.maximize()
class MyProgramApp(App):
colors = QueryDict()
colors.primary = rgba('#2D9CDB')
colors.secondary = rgba('#16213E')
colors.succes = rgba('#1FC98E')
colors.warning = rgba('#F2C94C')
colors.danger = rgba('#E85757')
colors.grey_dark = rgba('#C4C4C4')
colors.grey_light = rgba('#F5F5F5')
colors.black = rgba('#A1A1A1')
colors.white = rgba('#FFFFFF')
def build(self):
return MainWindow()
Same folder app, i have the following "view.py".
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.behaviors import ToggleButtonBehavior
from kivy.properties import StringProperty
from kivy.uix.screenmanager import ScreenManager
class MainWindow(BoxLayout):
username = StringProperty("Usuario")
def __init__(self, **kw):
super().__init__(**kw)
def on_press_home(self):
self.ids.scrn_mngr.current = "scrn_home"
class ViewManager(ScreenManager):
def __init__(self, **kw):
super().__init__(**kw)
class NavTab(ToggleButtonBehavior, BoxLayout):
text = StringProperty('')
icon = StringProperty('')
def __init__(self, **kw):
super().__init__(**kw)
and finally for that folder i have "myprogram.kv"
#:kivy 2.1.0
#:import Home views.home.Home
<MainWindow>:
spacing: dp(8)
canvas.before:
Color:
rgba: app.colors.white
Rectangle:
pos: self.pos
size: self.size
# NAVIGATION BAR
BoxLayout:
id: nav_menu
size_hint_x: .2
orientation: "vertical"
size_hint_min_x: dp(100)
# LOGO
BoxLayout:
id: logo_nbox
size_hint_y: .1
size_hint_min_y: dp(70)
padding: dp(16)
AnchorLayout:
anchor_x: "right"
size_hint_x: None
width: dp(52)
halign: "left"
Label:
text: "COMPANY"
halign: "center"
BoxLayout:
orientation: "vertical"
Label:
text: "COMPANY"
halign: "center"
Label:
text: "Phrase"
halign: "center"
# OPTIONS
GridLayout:
id: tabs_box
cols: 1
spacing: dp(4)
size_hint_y: .5
canvas.before:
Color:
rgba: app.colors.grey_dark
Rectangle:
pos: self.pos
size: [self.size[0], dp(1)]
NavTab:
text: "Home"
state: "down"
on_press: root.on_press_home()
# BODY
BoxLayout:
size_hint_x: .8
spacing: dp(8)
orientation: "vertical"
padding: [dp(16), dp(8), dp(12), dp(8)]
canvas.before:
Color:
rgba: app.colors.grey_light
Rectangle:
pos: self.pos
size: self.size
# SCREENS
BoxLayout:
ViewManager:
id: scrn_mngr
<ViewManager>:
Screen:
name: "scrn_home"
Home:
id: home
<NavTab>:
background_normal: ""
background_down: ""
background_color: [0,0,0,0]
group: "tabs"
size_hint_y: None
height: dp(45)
spacing: dp(4)
canvas.before:
Color:
rgba: [0,0,0,0] if self.state == "normal" else rgba("#E1F1FF")
Rectangle:
pos: self.pos
size: self.size
Color:
rgba: [0,0,0,0] if self.state == "normal" else app.colors.primary
Rectangle:
pos: [self.pos[0]+self.size[0]-dp(1), self.pos[1]]
size: [dp(8), self.size[1]]
Label:
halign: "left"
valign: "middle"
text: root.text
color: app.colors.grey_dark if root.state == "normal" else app.colors.primary
Then i got another folder called "views" inside i have another folder called "home", inside home we encounter 3 files "init.py", "home.kv", "home.py". the first one "init.py" is the following.
from .home import Home
then we got "home.kv".
#:kivy 2.1.0
<Home>:
orientation: "vertical"
Label:
size_hint_y: .1
text: "Other"
Button:
size_hint_y: .1
text: "popup"
on_press: root.open_popup()
BoxLayout:
size_hint_y: .8
id: home_box
<SomePopup>:
title: "SOME TITLE"
title_align: "center"
title_color: app.colors.primary
size_hint: .25, .8
size_hint_min_x: dp(200)
pos_hint: {"x": .1, "top": .9}
BoxLayout:
orientation: "vertical"
padding: [dp(0), dp(12), dp(0), dp(12)]
Label:
text: "Some text"
Button:
text: "create buttons on box"
on_press: root.modify_home_box()
and finally and the problem that i´m facing is whit the following file "home.py"
from kivy.lang import Builder
from kivy.uix.boxlayout import BoxLayout
from kivy.factory import Factory
from kivy.uix.popup import Popup
from kivy.uix.button import Button
from kivy.app import App
Builder.load_file('views/home/home.kv')
class Home(BoxLayout):
def __init__(self, **kwargs):
super().__init__(**kwargs)
def open_popup(self):
Factory.SomePopup().open()
class SomePopup(Popup):
def __init__(self, **kw):
super().__init__(**kw)
def modify_home_box(self):
my_app = App.get_running_app().root
my_box = my_app.ids.home.ids.home_box
custom_button = Button(
text = "something"
)
my_box.add_widget(custom_button)
That i´m trying to do is actually modify "home_box" with is store on ids Home dictionary, i also try with ObjectProperty (but that gives and Attribute Error, since i only could read propertys but doesnt modify it), instance of a new Home class doesnt work... searching for current app in App appear doesnt work since Home is store i think on screenManager...
I need add a button or some widget to "home_box" from outside class "SomePopup". I also drop here a repository on github with the whole code. github_repo
I don't know how to solve my issue, and i try with the resources available here on stack as well other net places... any help would be appreciate.

Just a very complicated path to the widget of interest. In your modify_home_box() method, try replacing:
my_app = App.get_running_app().root
my_box = my_app.ids.home.ids.home_box
with:
my_app = App.get_running_app().root
my_box = my_app.ids.scrn_mngr.ids.home.ids.home_box

Kivy Python: buttons and classes for multiple screens

I have a problem with my Kivy Python Code. I have 2 screens: 1st is to navigate to the second screen and on the 2nd screen there is a button to add text to a scrollview...navigating is working but it does not add any text to the scrollview...I think I need some help here! AttributeError: 'super' object has no attribute 'getattr'
import kivy
from kivy.app import App
from kivy.uix.label import Label
from kivy.uix.gridlayout import GridLayout
from kivy.uix.textinput import TextInput
from kivy.uix.button import Button
from kivy.uix.screenmanager import ScreenManager, Screen
from kivy.clock import Clock, mainthread
from kivy.core.window import Window
from kivy.uix.scrollview import ScrollView
from kivy.effects.scroll import ScrollEffect
from kivy.lang import Builder
Builder.load_string("""
<MenuScreen>:
name: 'mainmenu'
BoxLayout:
spacing: 1
orientation: "vertical"
Label:
text: "MAIN MENU"
Button:
text: 'Go to Screen 2'
on_release:
root.manager.current = 'screen2'
root.manager.transition.direction = "left"
Button:
text: 'Quit'
on_release: root.manager.current = app.exit_software()
<Screen2>:
name: 'screen2'
BoxLayout:
spacing: 1
orientation: "vertical"
ScrollView:
id: scroll_view
always_overscroll: False
BoxLayout:
size_hint_y: None
height: self.minimum_height
orientation: 'vertical'
Label:
id: label
text: "You can add some Text here by pressing the button"
size_hint: None, None
size: self.texture_size
Button:
text: 'Add text!'
size_hint_y: 0.1
on_release: app.add_text()
Button:
text: 'Back to main menu'
size_hint_y: 0.1
on_release:
root.manager.current = 'mainmenu'
root.manager.transition.direction = "right"
""")
# Declare both screens
class MenuScreen(Screen):
pass
class Screen2(Screen):
pass
class AddTextApp(App):
def __init__(self,**kwargs):
super().__init__(**kwargs)
def build(self):
# Create the screen manager
sm = ScreenManager()
sm.add_widget(MenuScreen(name='mainmenu'))
sm.add_widget(Screen2(name='screen2'))
return sm
def add_text(self):
self.root.ids.label.text += f"Some new Text\n"
self.root.ids.scroll_view.scroll_y = 0
def exit_software(self):
App.get_running_app().stop()
if __name__ == '__main__':
AddTextApp().run()
Thank you very much in advance!

The error occurred because self.root.ids gets access to widgets located in the root widget of the main class. To access the secondary screen elements, you need to add it to the main class (in your case, in ScreenManager) and set its id. Also, you have a lot of imported excess, so that it is clearly visible, I advise you to use Pycharm or something like that.
from kivy.app import App
from kivy.uix.screenmanager import Screen
from kivy.lang import Builder
kv = """
<MenuScreen>:
name: 'mainmenu'
BoxLayout:
spacing: 1
orientation: "vertical"
Label:
text: "MAIN MENU"
Button:
text: 'Go to Screen 2'
on_release:
root.manager.current = 'screen2'
root.manager.transition.direction = "left"
Button:
text: 'Quit'
on_release: root.manager.current = app.exit_software()
<Screen2>:
name: 'screen2'
BoxLayout:
spacing: 1
orientation: "vertical"
ScrollView:
id: scroll_view
always_overscroll: False
BoxLayout:
size_hint_y: None
height: self.minimum_height
orientation: 'vertical'
Label:
id: label
text: "You can add some Text here by pressing the button"
size_hint: None, None
size: self.texture_size
Button:
text: 'Add text!'
size_hint_y: 0.1
on_release: app.add_text()
Button:
text: 'Back to main menu'
size_hint_y: 0.1
on_release:
root.manager.current = 'mainmenu'
root.manager.transition.direction = "right"
ScreenManager:
MenuScreen:
id: menu_scr
Screen2:
id: scr_2
"""
class MenuScreen(Screen):
pass
class Screen2(Screen):
pass
class AddTextApp(App):
def __init__(self, **kwargs):
super().__init__(**kwargs)
def build(self):
return Builder.load_string(kv)
def add_text(self):
self.root.ids.scr_2.ids.label.text += f"Some new Text\n"
self.root.ids.scr_2.ids.scroll_view.scroll_y = 0
#staticmethod
def exit_software():
App.get_running_app().stop()
if __name__ == '__main__':
AddTextApp().run()

Kivy FileChooser Overlapping

I am using the FileChooserListView from kivy and have run into a overlapping text on scroll with screens that another user came across as well. I looked through their post on GitHub and read that some people are using the plyer FileChooser. I also saw that someone mentioned that it has to do with the Building function of the .kv file. I created a new kivy app and the problem did not occur, but when I return to my older app (no changes of any kind) the problem still occurs.
Sorry for the long post, but I am unsure how these two kivy app codes are different. Am I calling something twice that is causing the FileChooser to "hold" it's position? I am not oppose to using plyer's FileChooser, but could someone give me an example on how to implement it?
testing_kivy.py
from kivy.app import App
from kivy.lang.builder import Builder
from kivy.uix.screenmanager import ScreenManager, Screen
from kivy.uix.popup import Popup
from kivy.properties import ObjectProperty
from kivy.uix.floatlayout import FloatLayout
import os
def train_load(path, filename):
download_path = os.path.join(path, filename[0])
print(download_path)
class LoadDialog(FloatLayout):
load = ObjectProperty(None)
cancel = ObjectProperty(None)
class TrainingWindow(Screen):
def show_load_list(self):
content = LoadDialog(load=train_load, cancel=self.dismiss_popup)
self._popup = Popup(title="Load a file list", content=content, size_hint=(1, 1))
self._popup.open()
def dismiss_popup(self):
self._popup.dismiss()
class WindowManager(ScreenManager):
pass
kv_training = Builder.load_file('testing_kivy.kv')
class MyApp(App):
def build(self):
return kv_training
if __name__ == '__main__':
MyApp().run()
testing_kivy.kv
WindowManager:
TrainingWindow:
<TrainingWindow>
name: "training"
BoxLayout:
orientation: "vertical"
Button:
text: "Select Training Images"
font_size: 32
on_release: root.show_load_list()
Button:
text: "Select Training Annots"
font_size: 32
on_release: root.show_load_list()
Button:
text: "Set Parameters"
font_size: 32
on_release:
app.root.current = "parameters_train"
root.manager.transition.direction = "up"
Button:
text: "Back"
font_size: 16
on_release:
app.root.current = "select"
root.manager.transition.direction = "right"
<LoadDialog>:
BoxLayout:
size: root.size
pos: root.pos
orientation: "vertical"
FileChooserListView:
id: filechooser
BoxLayout:
size_hint_y: None
height: 30
Button:
text: "Cancel"
on_release: root.cancel()
Button:
text: "Load"
on_release: root.load(filechooser.path, filechooser.selection)
Older_app.py
from kivy.app import App
from kivy.lang.builder import Builder
from kivy.uix.screenmanager import ScreenManager, Screen
from kivy.uix.popup import Popup
from kivy.uix.button import Button
from kivy.uix.boxlayout import BoxLayout
from kivy.properties import ObjectProperty
from kivy.uix.floatlayout import FloatLayout
from kivy.uix.spinner import SpinnerOption
import os
import pandas as pd
def invalid_login():
app = App.get_running_app()
app.root.current = "main"
# Create a BoxLayout to add multiple lines or buttons to a PopUp
box = BoxLayout()
# Create PopUp
pop = Popup(
title="Invalid Password",
size_hint=(None, None), size=(200, 100),
content=box,
auto_dismiss=False
)
# Dismiss PopUp
box.add_widget(Button(text="Close", on_release=pop.dismiss))
pop.open()
def model_load(path, filename):
download_path = os.path.join(path, filename[0])
print(download_path)
def train_load(path, filename):
download_path = os.path.join(path, filename[0])
print(download_path)
def train_model_load(path, filename):
download_path = os.path.join(path, filename[0])
print(download_path)
class MainWindow(Screen):
def login(self):
if self.ids.password.text == "password":
self.ids.password.text = ""
app = App.get_running_app()
app.root.current = "select"
else:
self.ids.password.text = ""
invalid_login()
class SelectWindow(Screen):
pass
class LoadDialog(FloatLayout):
load = ObjectProperty(None)
cancel = ObjectProperty(None)
class TrainingWindow(Screen):
def show_load_list(self):
content = LoadDialog(load=train_load, cancel=self.dismiss_popup)
self._popup = Popup(title="Load a file list", content=content, size_hint=(1, 1))
self._popup.open()
def dismiss_popup(self):
self._popup.dismiss()
class ModelWindow(Screen):
def show_load_list(self):
content = LoadDialog(load=model_load, cancel=self.dismiss_popup)
self._popup = Popup(title="Load a file list", content=content, size_hint=(1, 1))
self._popup.open()
def dismiss_popup(self):
self._popup.dismiss()
class TrainModelWindow(Screen):
def show_load_list(self):
content = LoadDialog(load=train_model_load, cancel=self.dismiss_popup)
self._popup = Popup(title="Load a file list", content=content, size_hint=(1, 1))
self._popup.open()
def dismiss_popup(self):
self._popup.dismiss()
class ParametersTrainModelWindow(Screen):
pass
class ParametersTrainWindow(Screen):
pass
class WindowManager(ScreenManager):
pass
class OverViewTrainWindow(Screen):
pass
class OverViewTrainModelWindow(Screen):
pass
class OverViewModelWindow(Screen):
pass
class MyOption(SpinnerOption):
pass
kv_main= Builder.load_file('main.kv')
class MyApp(App):
def build(self):
return kv_main
if __name__ == '__main__':
MyApp().run()
main.kv
#:import utils kivy.utils
#:include select.kv
#:include training.kv
#:include model.kv
#:include train_model.kv
#:include parameters_train.kv
#:include parameters_train_model.kv
#:include overview_train_model.kv
#:include overview_train.kv
#:include overview_model.kv
WindowManager:
MainWindow:
SelectWindow:
TrainingWindow:
ModelWindow:
TrainModelWindow:
ParametersTrainWindow:
ParametersTrainModelWindow
OverViewTrainWindow:
OverViewTrainModelWindow:
OverViewModelWindow:
<MainWindow>
name: "main"
GridLayout:
cols: 1
BoxLayout:
orientation: "vertical"
canvas.before:
Color:
rgba: 0,0,0,1
Rectangle:
pos: self.pos
size: self.size
Label:
size_hint: 1, 1
text: "SPECPHASE"
font_size: 50
color:
utils.get_color_from_hex('#FF0000')
Label:
size_hint: 1, 1
text: "Object Detection App"
font_size: 40
BoxLayout:
size_hint: 1, 0.005
canvas.before:
Color:
rgba: (1,1,1,1)
Rectangle:
size: self.size
pos: self.pos
BoxLayout:
orientation: "horizontal"
size_hint: (0.35, 0.35)
padding: (0,0,25,0)
Label:
font_size: 20
text: "Password"
size_hint: (0.5, 0.35)
pos_hint: {'x': 1, 'y': 0.4}
background_color: (0,0,0,1)
canvas.before:
Color:
rgba: self.background_color
Rectangle:
size: self.size
pos: self.pos
TextInput:
id: password
multiline: False
size_hint: (0.5, 0.35)
pos_hint: {'x': 1, 'y': 0.4}
focus: True
background_color:
utils.get_color_from_hex('#18B8D9')
cursor_color: (0,0,0,1)
password: True
Button:
text: "Submit"
on_release: root.login()
select.kv
<SelectWindow#Screen>:
name: "select"
GridLayout:
cols: 1
GridLayout:
cols: 2
Button:
text: "Train"
font_size: 32
on_release:
app.root.current = "training"
root.manager.transition.direction = "right"
Button:
text: "Model"
font_size: 32
on_release:
app.root.current = "model"
root.manager.transition.direction = "left"
Button:
text: "Train & Model"
font_size: 32
on_release:
app.root.current = "train_model"
root.manager.transition.direction = "up"
training.kv
<TrainingWindow#Screen>:
name: "training"
BoxLayout:
orientation: "vertical"
Button:
text: "Select Training Images"
font_size: 32
on_release: root.show_load_list()
Button:
text: "Select Training Annots"
font_size: 32
on_release: root.show_load_list()
Button:
text: "Set Parameters"
font_size: 32
on_release:
app.root.current = "parameters_train"
root.manager.transition.direction = "up"
Button:
text: "Back"
font_size: 16
on_release:
app.root.current = "select"
root.manager.transition.direction = "right"
<LoadDialog>:
BoxLayout:
size: root.size
pos: root.pos
orientation: "vertical"
FileChooserListView:
id: filechooser
BoxLayout:
size_hint_y: None
height: 30
Button:
text: "Cancel"
on_release: root.cancel()
Button:
text: "Load"
on_release: root.load(filechooser.path, filechooser.selection)

After taking a break from this for while and restarting my brain, I was able to find the problem.
Not included in my question, I have a couple more .kv files that have a similar layout to the training.kv. They are used to access other screens. I found that I was calling FileChooserListView in each screen and I belive that is why I was seeing the stacking problem. I ended up removing all of them except for the one in my training.kv file and all is working.

python kivy screen confog

main.py file
from kivymd.app import MDApp
from kivy.lang import Builder
class Hero(MDApp):
def build(self):
return Builder.load_file("stackoverflow.kv")
Hero().run()
the above is the main.py file
please guys help me with this
stackoverflow.kv file
ScreenManager:
id: screenmanager
Screen:
id: accountscreen
name: "screen1"
BoxLayout:
oreintation: "vertical"
MDGridLayout:
cols:1## Heading ##
MDLabel:
text: "[color=00FF00]Sign In[/color]"
bold:True
markup:True
halign: "center"
valign: "middle"
MDTextField:
id: username
padding: "30dp"
spacing: "30dp"
hint_text:"User Name or Email"
pos_hint: {"center_x":.5,"center_y":.5}
MDTextField:
id:password
padding: "20dp"
spacing: "20dp"
hint_text:"Password"
MDRectangleFlatButton:
text:"Sign In"
padding: "16dp"
spacing: "16dp"
halign: "center"
pos_hint: {"center_x":.9,"center_y":.5}
on_press: app.root.current="screen2"
BoxLayout:
oreintation: "vertical"
Screen:
id: welcome_screen
name: "screen2"
MDLabel:
text: "welcome"
valign: "middle"
halign: "center"
any time i open the app i get the sign in screen how can i save the user information and clear the screen using config ini file please help me????

Here is a version of you code that uses Config to do what you want:
import os
from kivymd.app import MDApp
from kivy.lang import Builder
class Hero(MDApp):
def build(self):
sm = Builder.load_file("stackoverflow.kv")
self.load_my_config()
sm.current = self.initial_screen
return sm
def build_config(self, config):
# Make sure that the config has at least default entries that we need
config.setdefaults('app', {
'startup_screen': 'screen1',
})
def get_application_config(self):
# This defines the path and name where the ini file is located
return str(os.path.join(os.path.expanduser('~'), 'Hero.ini'))
def on_stop(self):
# save the config when the app exits
self.save_config()
def save_config(self):
# this writes the data we want to save to the config
# set the data in the config
self.config.set('app', 'startup_screen', 'screen2')
# write the config file
self.config.write()
def load_my_config(self):
# extract our saved data from the config (it has already been read)
self.initial_screen = self.config.get('app', 'startup_screen', fallback='screen1')
Hero().run()
And in the kv file, I would add a call to save the configuration when the Sign In button is pressed:
MDRectangleFlatButton:
text:"Sign In"
padding: "16dp"
spacing: "16dp"
halign: "center"
pos_hint: {"center_x":.9,"center_y":.5}
on_press:
app.root.current="screen2"
app.save_config()

Mimic Tkinter file open in Kivy

I have worked mostly with Tkinter before and I used the following code to store path of file I selected. After exploring Kivy, it doesn't seem like Kivy have a simple function like this. So I tried using the filechoser instead
path = filedialog.askopenfilename(initialdir="/", title="Select file")
Main code is very simple
class checker_ui(GridLayout):
def findreport(self,path):
pass
class Checker(App):
def build(self):
return checker_ui()
if __name__ == '__main__':
Checker().run()
Then I created a .kv file just to see what filechooser looks like. The script would just open and freeze.
<checker_ui>:
BoxLayout:
FileChooserIconLayout:
id:filechooser
on_selection:root.select(*args)
Here is the output
I search all over the place and did not see anyone with a similar issue. Is there an alternative I can try to mimic the tkinter behaviour or am I stuck with this issue? I'm on a Windows machine and normal kivy widget works, ie: button,label etc.

so I wrote a lot more code than you (based heavily on the kivy example # https://kivy.org/docs/api-kivy.uix.filechooser.html#usage-example)
from kivy.app import App
from kivy.uix.floatlayout import FloatLayout
from kivy.factory import Factory
from kivy.properties import ObjectProperty
from kivy.uix.popup import Popup
from kivy.lang import Builder
Builder.load_string("""
#:kivy 1.1.0
<Root>:
text_input: text_input
BoxLayout:
orientation: 'vertical'
BoxLayout:
size_hint_y: None
height: 30
Button:
text: 'Load'
on_release: root.show_load()
Button:
text: 'Save'
on_release: root.show_save()
BoxLayout:
TextInput:
id: text_input
text: ''
RstDocument:
text: text_input.text
show_errors: True
<LoadDialog>:
BoxLayout:
size: root.size
pos: root.pos
orientation: "vertical"
FileChooserListView:
id: filechooser
BoxLayout:
size_hint_y: None
height: 30
Button:
text: "Cancel"
on_release: root.cancel()
Button:
text: "Load"
on_release: root.load(filechooser.path, filechooser.selection)
<SaveDialog>:
text_input: text_input
BoxLayout:
size: root.size
pos: root.pos
orientation: "vertical"
FileChooserListView:
id: filechooser
on_selection: text_input.text = self.selection and self.selection[0] or ''
TextInput:
id: text_input
size_hint_y: None
height: 30
multiline: False
BoxLayout:
size_hint_y: None
height: 30
Button:
text: "Cancel"
on_release: root.cancel()
Button:
text: "Save"
on_release: root.save(filechooser.path, text_input.text)""")
import os
class LoadDialog(FloatLayout):
load = ObjectProperty(None)
cancel = ObjectProperty(None)
class SaveDialog(FloatLayout):
save = ObjectProperty(None)
text_input = ObjectProperty(None)
cancel = ObjectProperty(None)
class Root(FloatLayout):
loadfile = ObjectProperty(None)
savefile = ObjectProperty(None)
text_input = ObjectProperty(None)
def dismiss_popup(self):
self._popup.dismiss()
def show_load(self):
content = LoadDialog(load=self.load, cancel=self.dismiss_popup)
self._popup = Popup(title="Load file", content=content,
size_hint=(0.9, 0.9))
self._popup.open()
def show_save(self):
content = SaveDialog(save=self.save, cancel=self.dismiss_popup)
self._popup = Popup(title="Save file", content=content,
size_hint=(0.9, 0.9))
self._popup.open()
def load(self, path, filename):
with open(os.path.join(path, filename[0])) as stream:
self.text_input.text = stream.read()
self.dismiss_popup()
def save(self, path, filename):
with open(os.path.join(path, filename), 'w') as stream:
stream.write(self.text_input.text)
self.dismiss_popup()
class Editor(App):
def build(self):
return Root()
if __name__ == '__main__':
Editor().run()

Solution
Replace FileChooserIconLayout with FileChooserIconView
Add a BoxLayout and make FileChooserIconView a children of the BoxLayout
Example
main.py
from kivy.app import App
from kivy.uix.gridlayout import GridLayout
class Checker_ui(GridLayout):
def findreport(self, path):
print("path=", path)
class Checker(App):
def build(self):
return Checker_ui()
if __name__ == "__main__":
Checker().run()
checker.kv
#:kivy 1.10.0
<Checker_ui>:
BoxLayout:
size: root.size
pos: root.pos
orientation: "vertical"
FileChooserIconView:
id: filechooser
on_selection: root.select(*args)
Output

Hey if anyone wants to open all types of file just use(mp4,jpg,pdf,txt,docs...etc)
import webbrowser
webbrowser.open(filename[0])