Introduction to Kivy ; A Cross-platform Python Framework

Kivy is a graphical user interface open-source Python library that allows you to develop multi-platform applications on Windows, macOS, Android, iOS, Linux, and Raspberry Pi. The best thing about kivy is, it performs better than HTML5 cross-platform alternatives. 

Note that it is necessary to have Python 3 on your machine to make use of the library.

Installation in Windows:

• Step 1: Update the pip and wheel before installing kivy by entering this command in cmd- 
  

python -m pip install --upgrade pip wheel setuptools

• Step 2: Install the dependencies- 
  

python -m pip install docutils pygments pypiwin32 kivy.deps.sdl2 kivy.deps.glew
python -m pip install kivy.deps.gstreamer
python -m pip install kivy.deps.angle

• Step 3: Install kivy.

python -m pip install kivy

It will result in something like the below image:

Installation in Linux:

• Step 1: Add the PPA by entering this command in terminal- 
  

 sudo add-apt-repository ppa:kivy-team/kivy

• Step 2: Update your package list using your package manager- 
  

sudo apt-get update

• Step 3: Install Kivy 
  

sudo apt-get install python3-kivy

Create an application

There are three steps of creating an application with kivy:

1. Inherit Kivy’s App class which represents the window for our widgets
2. Create a build() method, which will show the content of the widgets.
3. And at last calling of the run() method. 
   

Example :
This is python3 code to make a simple application that shows the desired text on the system’s screen:

Python3

import kivy
kivy.require('1.10.0')

from kivy.app import App
from kivy.uix.button import Label

# Inherit Kivy's App class which represents the window
# for our widgets
# HelloKivy inherits all the fields and methods
# from Kivy
class HelloKivy(App):

    # This returns the content we want in the window
    def build(self):

        # Return a label widget with Hello Kivy
        return Label(text ="Hello Geeks")

helloKivy = HelloKivy()
helloKivy.run()

To run this code open cmd(terminal in Linux) and go through the directory in which the code is saved and type this command- 

python file_name.py

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