Kivy Tutorial: Part 3 – Loading Saved Data into Buttons

Welcome to part 3 of our Kivy tutorial series! In this tutorial, we will learn how to load saved data from a JSON file into buttons using the CRUD (Create, Read, Update, Delete) method with Kivy.

Step 1: Create a JSON File

First, we need to create a JSON file to store the data that we want to load into our buttons. Let’s create a file named “data.json” and add some sample data:

“`json
{
“buttons”: [
{“id”: 1, “text”: “Button 1”},
{“id”: 2, “text”: “Button 2”},
{“id”: 3, “text”: “Button 3”}
]
}
“`

Step 2: Load Data from JSON File

Next, we will write Kivy code to load the data from the JSON file into our buttons. We will create a function to load the data and then call that function when our app starts:

“`python
import json

from kivy.app import App
from kivy.uix.button import Button
from kivy.uix.boxlayout import BoxLayout

class MyApp(App):
def build(self):
# Load data from JSON file
with open(‘data.json’, ‘r’) as file:
data = json.load(file)

# Create buttons from the loaded data
layout = BoxLayout(orientation=’vertical’)
for button_data in data[‘buttons’]:
button = Button(text=button_data[‘text’])
layout.add_widget(button)

return layout

if __name__ == ‘__main__’:
MyApp().run()
“`

Step 3: Run the App

Finally, we can run our Kivy app and see the buttons loaded with the data from the JSON file:

“`bash
$ python myapp.py
“`

Conclusion

Congratulations! You have learned how to load saved data from a JSON file into buttons using the CRUD method with Kivy. In the next tutorial, we will learn how to update and delete data from the JSON file using Kivy.