Kivy

Cross-Platform GUI In Python

Amit Kotlovski / @amitkot

Me

• Instructor
• Teach IT Courses at John Bryce
• Android / Python / Java

Agenda

• GUI in Python
• Kivy Features
• Programming with Kivy
• Demo
• Kivy Open Issues

Python

class Greetings(object):
    def say_hello(self):
        print('Hello and welcome to the Kivy Presentation!')

g = Greetings()
g.say_hello()

GUI in Python

• tkinter (thin layer over tcl/tk)
• wxPython (wxWidgets)
• PySide (QT)
• PyGTK (GTK)
• Kivy

Let's Talk about Kivy

Cross-Platform

Linux, Mac OS X, Windows, Android, iOS

LGPL3 License

Good for Businesses

Stable and Documented

• Programming Guide
• Tutorials
• API

GPU Accelerated

Buit over OpenGL ES 2

Programming with Kivy

Hello, Kivy!

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

class MyApp(App):
    def build(self):
        return Button(text='Hello, Kivy!')

if __name__ == '__main__':
    MyApp().run()

Hello Kivy (2)

# main.py
from kivy.app import App
from kivy.uix.boxlayout import BoxLayout

class MyLayout(BoxLayout):
    pass

class MyApp(App):
    def build(self):
        return MyLayout()

if __name__ == '__main__':
    MyApp().run()

# my.kv
<MyLayout>:
    Button:
        text: 'Left'
    Button:
        text: 'Right'

Demo

• Pong
• Paint
• Particle Panda

Game On Google Play

Match 3

Game On Apple's iTunes

Deflectouch

Packaging for Mobile

• Embed Python and dependencies inside the Package
  • ⇒ Package size is increased (>6mb on Android)
• Enables accessing the native API
• Build tool cross-compiles the app for the mobile platform

Open Issues

• Mobile Packaging is a WIP, supporting only ARM at the moment
• Mobile App size is rather big (>6mb)
• No GUI Designer (planned for next Google Summer of Code)

Summary

• Kivy is an interesting option for developing GUI
• Cross Platform support direct from the box
• Good for products and prototypes

Links

• Website - http://kivy.org
• Source - http://github.com/kivy/kivy
• IRC - #Kivy on irc.freenode.net

Questions

Thanks!

Amit Kotlovski / @amitkot