Kivy regarding binding multiple buttons to each individual function - button

Question

Hi I am new to Kivy and just started programming. I have problem, I want to bind all the buttons i created in the for loops to the on_release for every single buttons. So that to make all buttons once click is able to go different screens. Below is my a small part of my code( I EDITED with more information)
#this are the pictures of the buttons
a = '_icons_/mcdonald2.png'
b = '_icons_/boostjuice.png'
c = '_icons_/duckrice.png'
d = '_icons_/subway_logo.png'
e = '_icons_/bakery.png'
f = '_icons_/mrbean.png'
#these are the names of the different screen
n1 = 'mcdonald_screen'
n2 = 'boost_screen'
n3 = 'duck_screen'
n4 = 'subway_screen'
n5 = 'bakery_screen'
n6 = 'mrbean_screen'
arraylist = [[a,n1],[b,n2],[c,n3],[d,n4],[e,n5],[f,n6]]
self.layout2 = GridLayout(rows=2, spacing = 50,size_hint = (0.95,0.5),
pos_hint = {"top":.65,"x":0},padding=(90,0,50,0))
for image in arraylist:
self.image_outlet = ImageButton(
size_hint=(1, 0.1),
source= image[0])
self.screen_name = image[1]
self.image_outlet[0].bind(on_release= ??) ## This part is the one
i want to change
according to the
different screen
self.layout2.add_widget(self.image_outlet)
self.add_widget(self.layout2)
GUI = Builder.load("_kivy_/trying.kv")
class TRYINGApp(App):
def build(self):
return GUI
def change_screen(self,screen_name):
screen_manager = self.root.ids['screen_manager']
screen_manager.current = screen_name
#kv file#
# all the varies kv file screen
#: include _kivy_/variestime_screen.kv
#: include _kivy_/homescreen.kv
#: include _kivy_/mcdonaldscreen.kv
#: include _kivy_/firstpage.kv
#: include _kivy_/mrbeanscreen.kv
#: include _kivy_/boostscreen.kv
#: include _kivy_/duckscreen.kv
#: include _kivy_/subwayscreen.kv
#: include _kivy_/bakeryscreen.kv
GridLayout:
cols:1
ScreenManager:
id : screen_manager
FirstPage:
name :"first_page"
id : first_page
VariesTimeScreen:
name: "variestime_screen"
id: variestime_screen
HomeScreen:
name : "home_screen"
id : home_screen
McDonaldScreen:
name : "mcdonald_screen"
id : mcdonald_screen
BoostScreen:
name : "boost_screen"
id : boost_screen
DuckScreen:
name: "duck_screen"
id: duck_screen
SubwayScreen:
name:"subway_screen"
id: subway_screen
BakeryScreen:
name: "bakery_screen"
id: bakery_screen
MrBeanScreen:
name: "mrbean_screen"
id : mrbean_screen

Answer 1

Your on_release can be something like:
self.image_outlet.bind(on_release=partial(self.change_screen, image[1]))
where change_screen is a method that you must define:
def change_screen(self, new_screen_name, button_instance):
# some code to change to the screen with name new_screen_name
Note that I have removed the [0] from self.image_outlet (I suspect that was a typo). I can't determine what code should go in the new method, because you haven't provided enough information.
If you have a change_screen method in your App class, you can use that directly by referencing it in your on_release as:
self.image_outlet.bind(on_release=partial(App.get_running_app().change_screen, image[1]))
You will need to make a minor change to your change_screen method to handle additional args:
def change_screen(self, screen_name, *args):
screen_manager = self.root.ids['screen_manager']
screen_manager.current = screen_name