Table of contents
1.
Introduction
2.
Spinner Widget in Kivy
2.1.
Implementation
2.1.1.
Python Code
2.1.2.
Kivy File
2.1.3.
App Output
3.
Frequently Asked Questions
3.1.
What are Kivy widgets?
3.2.
What is Kivy Uix, exactly?
3.3.
Is Kivy good for Android?
3.4.
What is Kivy's relative layout?
4.
Conclusion 
Last Updated: Mar 27, 2024
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Spinner Widget in Kivy Using .kv File

Author Aman Thakur
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Introduction

In this article, we will be covering Spinner Widget in Kivy. It is a Python using GUI tool that works on any platform provided by Kivy module python. We will also see how to use the .kv file in Kivy to develop the application's layout. This article assumes that you have been somewhat familiar with the Basics of Python otherwise it will be a bit difficult to understand it at first glance however you can still go through this article.

Spinner Widget in Kivy

Spinner is a widget that allows you to select one value from a group of options quickly. A spinner's default state displays the value that is currently selected. Touching the spinner brings up a dropdown menu with all of the other options from which the user can choose. 

A spinner object, like a combination box, can contain numerous values and one of them can be picked. The spinner object can have a callback attached to it to get notifications when a value is selected.

Implementation

To work with a spinner you must have to import:
from kivy.uix.spinner import Spinner

Below is the implementation of the Algorithm

1  import kivyApp
2  import spinner
3  import Floatlayout(according to need)
4. Create Layout class
    4.1 define the clicked function in it
5. Create App class
6. create .kv file (name same as the app class)
    6.1 create Spinner
    6.2 create callback 
    6.4 And many more styling as needed
7. return Layout/widget/Class(according to requirement)
8. Run an instance of the class

Python Code

from kivy.base import runTouchApp
from kivy.uix.spinner import Spinner

spinner = Spinner(
   # default value shown
   text='Choose',
   # available values
   values=('Python', 'C++', 'Java', 'Others'),
   # just for positioning in our example
   size_hint=(None, None),
   size=(100, 44),
   pos_hint={'center_x': .5, 'center_y': .5})

def show_selected_value(spinner, text):
   print('The spinner', spinner, 'has text', text)

spinner.bind(text=show_selected_value)

runTouchApp(spinner)
You can also try this code with Online Python Compiler
Run Code

Kivy File

# Creating the Layout i.e root of the Layout class
FloatLayout:
    Spinner:
        size_hint: None, None
        size: 100, 44
        pos_hint: {'center': (.5, .5)}
        text: 'Choose'
        values: 'Java', 'C++', 'Python', 'Others'
        on_text:
            print("The spinner {} has text {}".format(self, self.text))
You can also try this code with Online Python Compiler
Run Code

App Output

Frequently Asked Questions

What are Kivy widgets?

In Kivy, a Widget is the fundamental component of a graphical user interface. It comes with a canvas on which you may draw on the screen. It takes in information and responds to it.

 

What is Kivy Uix, exactly?

A module is kivy.uix. Widgets are part of the User Experience and are graphical user interface components. The kivy.uix module contains classes for creating and managing Widgets.

 

Is Kivy good for Android?

Kivy is a great tool for developing Android Apps. Kivy is an excellent tool for creating Android applications. The nicest thing about kivy is that it is cross-platform, which means that the same project can be used to create apps for iOS, Android, Windows, and OS X.

It does, however, have certain performance drawbacks (as do most cross-platform tools like unity, cocos etc).

 

What is Kivy's relative layout?

Relative Layout: This layout allows you to assign children relative coordinates. Use the FloatLayout if you want absolute placement. The RelativeLayout class is similar to the FloatLayout class, with the exception that its child widgets are positioned relative to the layout.

Conclusion 

If you have reached here that means, you really enjoyed this article. This article covers the implementation of the Carousel widget in kivy with code snippets and their use cases. You might be interested in articles such as Floating Layout in KivyCarousel Layout in KivyButton Action in Kivy, Button Color in Kivy and Slider widget in Kivy.

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