How to automatically save and load user input kivy

Question

I am making an app where there is a profile screen in which you can enter generic profile information (name, height, weight, ect..) using textinput boxes. I know there is a way to put a button next to each textinput box to save the information and another button to load the information. I am wondering if there is a way to automatically load this information when the user opens the app rather than manually loading the information by hitting a button. Some have suggested ussing a subclass of ConfigParser to parse standard ini files and use this to load app-specific settings, but I have no idea how to do this.

Kivy File:

<Phone>:
result: _result
h: _h
w: _w


AnchorLayout:
    anchor_x: 'center'
    anchor_y: 'top'

    ScreenManager:
        size_hint: 1, .9
        id: _screen_manager
        Screen:
            name: 'home'
            canvas.before:
                Rectangle:
                    pos: self.pos
                    size: self.size
                    source: "/home/aaron/Desktop/main.png"
            Label:
                markup: True
                text: '[size=100][color=ff3333]Welcome to [color=ff3333]Diabetes Manager[/color][/size]'
        Screen:
            name: 'menu'
            GridLayout: 
                cols: 2
                padding: 50
                canvas.before:
                    Rectangle:
                        pos: self.pos
                        size: self.size
                        source: "/home/aaron/Desktop/main.png"

                Button:
                    text: 'My Profile'
                    on_press: _screen_manager.current = 'profile' 
                Button:
                    text: 'History'
                    on_press: _screen_manager.current = 'history'     

                Button:
                    text: 'New Entry'
                    on_press: _screen_manager.current = 'new_entry' 
                Button:
                    text: 'Graph'
                    on_press: _screen_manager.current = 'graph' 
                Button:
                    text: 'Diet'
                    on_press: _screen_manager.current = 'diet' 
                Button:
                    text: 'Settings'
                    on_press: _screen_manager.current = 'settings' 

        Screen:
            name: 'profile'
            GridLayout: 
                cols: 1
                BoxLayout:
                    Label:
                        size_hint_x: 0.22
                        bold: True
                        markup: True
                        text: '[size=40][color=0000ff]Name[/color][/size]'
                    TextInput:
                        id: _name
                        hint_text: 'Name'

                BoxLayout:
                    Label:  
                        size_hint_x: 0.22
                        bold: True
                        markup: True
                        text: '[size=40][color=0000ff]Gender[/color][/size]'
                    TextInput:
                        id: _gender1
                        hint_text: 'Gender'

                BoxLayout:
                    Label:
                        size_hint_x: 0.22
                        bold: True
                        markup: True
                        text: '[size=34][color=0000ff]Type of Diabetes[/color][/size]'
                    TextInput:
                        id: _type
                        hint_text: 'Type of Diabetes'

                BoxLayout:
                    Label:
                        size_hint_x: 0.22
                        bold: True
                        markup: True
                        text: '[size=40][color=0000ff]Height (in)[/color][/size]'
                    TextInput:
                        id: _h
                        hint_text: 'Height in inches'

                BoxLayout:
                    Label:
                        size_hint_x: 0.22
                        bold: True
                        markup: True
                        text: '[size=40][color=0000ff]Weight (lb)[/color][/size]'
                    TextInput:
                        id: _w
                        hint_text: 'Weight in pounds'

                BoxLayout:
                    Button:
                        text: 'Calculate BMI'
                        on_press: root.product(*args)

                    Label:
                        size_hint_x: 4.5
                        id:_result
                        bold: True
                        markup: True
                        text: '[size=40][color=0000ff]BMI[/color][/size]'

                BoxLayout:
                    Label:
                        size_hint_x: 0.22
                        bold: True
                        markup: True
                        text: '[size=30][color=0000ff]List of Medications[/color][/size]'
                    TextInput:
                        id: _meds
                        hint_text: 'List of Medications'

                BoxLayout:
                    Label:
                        size_hint_x: 0.22
                        bold: True
                        markup: True
                        text: '[size=38][color=0000ff]Insulin Times[/color][/size]'
                    TextInput:
                        id: _times
                        hint_text: 'Please Enter Times to Take Insulin'


        Screen:
            name: 'history'
            GridLayout: 
                cols:1

        Screen:
            name: 'new_entry'
            GridLayout:
                cols:1

                BoxLayout:
                    Label:
                        size_hint_x: 0.22
                        bold: True
                        markup: True
                        text: '[size=40][color=0000ff]Time[/color][/size]'
                    TextInput:
                        id: _time
                        hint_text: 'Current Time'

                BoxLayout:
                    Label:
                        size_hint_x: 0.22
                        bold: True
                        markup: True
                        text: '[size=28][color=0000ff]Blood Sugar (mg/dL)[/color][/size]'
                    TextInput:
                        id: _glucose_reading
                        hint_text: 'Current Blood Sugar'

                BoxLayout:
                    Label:
                        size_hint_x: 0.22
                        bold: True
                        markup: True
                        text: '[size=40][color=0000ff]Carbs[/color][/size]'
                    TextInput:
                        id: _food
                        hint_text: 'Total Carbs for meal'

                BoxLayout:
                    Label:
                        size_hint_x: 0.22
                        bold: True
                        markup: True
                        text: '[size=30][color=0000ff]Medications Taken[/color][/size]'
                    TextInput:
                        id: _meds_taken
                        hint_text: 'Please Enter Any Medications Taken'


        Screen:
            name: 'graph'
            GridLayout: 
                cols: 3
                padding: 50
            Label: 
                markup: True
                text: '[size=24][color=dd88ff]Your Graph[/color][/size]'

        Screen:
            name: 'diet'
            GridLayout: 
                cols: 3
                padding: 50
            Label: 
                markup: True
                text: '[size=24][color=dd88ff]Reccomended Diet[/color][/size]'


        Screen:
            name: 'settings'
            GridLayout: 
                cols: 3
                padding: 50
            Label: 
                markup: True
                text: '[size=24][color=dd88ff]Settings[/color][/size]'


AnchorLayout:
    anchor_x: 'center'
    anchor_y: 'bottom'
    BoxLayout:
        orientation: 'horizontal'
        size_hint: 1, .1
        Button:
            id: btnExit
            text: 'Exit'
            on_press: app.stop() 
        Button:
            text: 'Menu'
            on_press: _screen_manager.current = 'menu'

Answer 1

Kivy has storage functionality inbuilt. By using the inbuilt methods it will store the file in the correct place for Android or iOS without you having to worry about the correct location. Here's their docs:https://kivy.org/docs/api-kivy.storage.html#module-kivy.storage

And a short example to show how to put, retrieve and delete values:

from kivy.storage.jsonstore import JsonStore

store = JsonStore('baz.json')
store.put('foo', 'bar')

if store.exists('foo'):
    print('foo is:', store.get('foo'))
    store.delete('foo')