Xtykutl

Hello i have an application in kivy which has username and password 

when user enter admin admin it goes to python function and say granted now the problem is 

whenever it goes to function and execute the function it would return 1 how do i compare that 1 in kivy file as i am not aware of this and searched a lot no luck

import kivy

from kivy.app import App

from kivy.uix.widget import Widget

from kivy.uix.gridlayout import GridLayout

from kivy.uix.popup import Popup

from kivy.uix.label import Label

from kivy.uix.button import Button

import time

from kivy.uix.screenmanager import ScreenManager, Screen

from kivy.lang.builder import Builder

kivy.require('1.10.1')



class Admin(GridLayout,Screen):



    def valid(self,u,p):

        if "admin" == "admin" and "admin" == "admin":

            print('Access Granted !')



        else:

            print('Invalid User')





class UserPage(Screen):

    pass





class ScreenManagement(ScreenManager):

    pass





kv_file = Builder.load_file('Admin.kv')





class AdminApp(App):

    def build(self):

        return kv_file



r=AdminApp()

r.run()

ScreenManagement:

    Admin:

    UserPage:



<CustLabel@Label>:

    font_size:20



<Custbutton@Button>:

    font_size:20



<MyPopup@Popup>:

    auto_dismiss: False

    Button:

        text: 'Close me!'

        on_release: root.dismiss()



<Admin>:

    name: "Admin"

    id:check

    d_username:entry_username

    d_password:entry_password

    rows:5

    spacing:10



    BoxLayout:

        CustLabel:

            text:'Enter UserName'

        TextInput:

            id:entry_username

            multiline:False

            cursor_color: 1, 0, 0, 1

            hint_text: 'Username'

            padding_x: [50,50]







    BoxLayout:

        CustLabel:

            text:'Enter Password'

        TextInput:

            id:entry_password

            hint_text: 'Password'

            padding_x: [50,50]

            password: True

            multiline:False



    BoxLayout:

        Custbutton:

            text:'Go'

            on_press:check.valid(entry_username.text,entry_password.text)

            # i want to exectute on_release: app.root.current = "userpage" when its true ?????????????





<UserPage>:

    name: "userpage"

    Button:

        text: "back"

        on_release: app.root.current = "Admin"

The callback does not return anything, in general the properties are used to share states, in this case a BooleanProperty must be created that indicates if it is authenticated or not.

*.py

class Admin(GridLayout,Screen):

    isAuthenticated =BooleanProperty(False)



    def valid(self,u,p):

        if "admin" == "admin" and "admin" == "admin":

            print('Access Granted !')

            self.isAuthenticated = True

        else:

            print('Invalid User')

*.kv

Custbutton:

    text:'Go'

    on_press: check.valid(entry_username.text,entry_password.text)

    on_release: if root.isAuthenticated: app.root.current = "userpage"

Although it is not advisable to use on_release to make the Screen change because in general the authentication takes some time so it is better to listen to the change of state:

*.kv

<Admin>:

    name: "Admin"

    id:check

    d_username:entry_username

    d_password:entry_password



    on_isAuthenticated: if root.isAuthenticated: app.root.current = "userpage"

    rows:5

    spacing:10



    BoxLayout:

        CustLabel:

            text:'Enter UserName'

        TextInput:

            id:entry_username

            multiline:False

            cursor_color: 1, 0, 0, 1

            hint_text: 'Username'

            padding_x: [50,50]



    BoxLayout:

        CustLabel:

            text:'Enter Password'

        TextInput:

            id:entry_password

            hint_text: 'Password'

            padding_x: [50,50]

            password: True

            multiline:False



    BoxLayout:

        Custbutton:

            text:'Go'

            on_press: check.valid(entry_username.text,entry_password.text)