Kivy is an open source framework for developing apps for natural user interfaces such as touch screens and multi-touch displays. The Kivy framework is platform independent. Implementations exist for Android, iOS, Linux, Mac OS-X, and Windows. The programming language Python is used to develop apps based on Kivy. Since Kivy sits on top of OpenGL, it is very well suited for graphics applications such as games or information displays. Kivy can be used both to develop prototypes as well as products that are available through the usual app stores. In this talk you will learn all the basics about the Kivy framework including live demonstrations of some Kivy-based apps. We will also show how you can package Kivy-based apps to distribute via app stores. Some examples for real-world apps shows you how we are using Kivy to develop prototypes and products for health, medicine and biology. Of course, you learn about benefits and limitations of using Kivy for app development.

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Developing Apps for Android

and Other Platforms with Kivy

and Python

Andreas Schreiber <andreas.schreiber@dlr.de>

droidcon 2013, Berlin, 09. April 2013

www.DLR.de • Chart 1 > droidcon 2013 > A. Schreiber • Developing Apps for Android and Other Platforms with Kivy and Python > 09.04.2013

Outline

•Introduction

•Python

• Kivy

•Demos

•Limitations

•Credits

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Me

www.DLR.de • Chart 3 > droidcon 2013 > A. Schreiber • Developing Apps for Android and Other Platforms with Kivy and Python > 09.04.2013

Scientist,

Head of department

Founder,

CEO

Enthusiastic about

Python

DLR

German Aerospace Center

−Research Institution

−Space Agency

−Project Management Agency

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Locations and employees

7400 employees across

32 institutes and facilities at

16 sites.

Offices in Brussels, Paris,

Tokyo and Washington.

~1400 employees develop software

Cologne

Oberpfaffenhofen

Braunschweig

Goettingen

Berlin

Bonn

Neustrelitz

Weilheim

Bremen Trauen

Lampoldshausen

Stuttgart

Stade

Augsburg

Hamburg

Juelich

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Python

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Python

•General- purpose, high-level programming language

•Object- oriented, aspect - oriented, functional

•Dynamic type system

• Easy-to-learn with clear and expressive syntax

def faculty(x):

if x > 1:

return x * faculty(x - 1)

else :

return 1

Python on Mobile Devices

Early Mobile Development with Python

•PyS60 for Symbian

•Python CE for Windows Mobile

Current Mobile Development with Python

•Scripting Layer for Android (SL4A)

•Python for Android (Py4A)

• PySide / Qt for Android

•WinRT / IronPython for Windows 8

• Kivy…

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Kivy

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Kivy

•Platform- independent Python -Framework

•Available for

•Android

•iOS

•Meego

•Windows

•Linux

• OSX

•(Raspberry Pi)

•Development in Python on all platforms

•Not emulated!

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kivy.org

Kivy Basics

• Framework for Natural User Interfaces (NUI)

•Touchscreens / Multi - Touch

•GPU accelerated graphics

•Based on OpenGL ES 2.0

•Suitable for prototypes as well as products

•Porting to new platforms is easy

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Kivy Software

•Open Source (LGPL ), 7 Core developer

•Source code: https://github.com/kivy

•Documentation: http://kivy.org/docs

•Kivy on Google Play:

https://play.google.com/store/apps/details?id=org.kivy.pygame

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Kivy says Hello!

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from kivy.app import App

from kivy.uix.button import Button

class HelloApp(App):

def build(self):

return Button(text='Hello Berlin')

HelloApp().run()

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Development with Kivy

•Python for widgets , input , program logic

•Language KV for layout und graphics

•Cython for low-level access to graphic routines

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"Hello Berlin" with KV

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from kivy.app import App

class HelloApp(App):

pass

HelloApp().run()

#:kivy 1.0

Button:

text: 'Hello Berlin'

File hello.kv

defines root widget

Example: Pong

www.DLR.de • Chart 17 > droidcon 2013 > A. Schreiber • Developing Apps for Android and Other Platforms with Kivy and Python > 09.04.2013

import kivy

from kivy.app import App

from kivy.uix.widget import Widget

class PongGame(Widget):

pass

class PongApp (App):

def build(self):

return PongGame()

if __name__ == '__main__' :

PongApp().run()

Pong Graphics

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#:kivy 1.6.0

<PongGame>:

canvas:

Rectangle:

pos: self.center_x - 5, 0

size: 10, self.height

Label:

font_size: 70

center_x: root.width / 4

top: root.top - 50

text: "0"

Label:

font_size: 70

center_x: root.width * 3 / 4

top: root.top - 50

text: "0"

Pong

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Full example: http://kivy.org/docs/tutorials/pong.html

Accessing Java Classes from Python

•Smartphones have many APIs

•Camera, Compass, Contacts, Location, …

•Access from Python via PyJNIus

•https://github.com/kivy/pyjnius

•Implemented with JNI and Java reflection

Example

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from jnius import autoclass

Hardware = autoclass('org.renpy.android.Hardware')

print 'DPI is', Hardware.getDPI()

Packaging

•Creating packages for Windows, OSX, Android und iOS:

http://kivy.org/docs/guide/packaging.html

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Build Tools

Tool chain

•Python-for-android

•Cross compiler for ARM

•Android SDK & NDK

•Python and some Python packages

Buildozer

•Hides the complexity: Downloads, compiles, packages Kivy source code

•https://github.com/kivy/buildozer

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% buildozer android debug deploy run

Demos

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Kivy Showcase

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Kivy Pictures

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Small Dragon Luki

Speech therapy game for kids

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Small Dragon Luki

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MQTT Client

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Steering Plant Growth

•Webcam takes picture of plants

•Computer detects plant

•Computer generates an image for

lighting

•Light source (e.g., a projector)

illuminates the plant using the

generated image

mobile.cologne > Andreas Schreiber • Plattformübergreifende Apps entwickeln mit Kivy und Python > 08.11.2012 www.DLR.de • Folie 29

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Other Examples…

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iOS-App Deflectouch

https://itunes.apple.com/de/app/deflectouch/id505729681

iOS/Android-App ProcessCraft

https://itunes.apple.com/gb/app/processcraft/id526377075

http://showgen.com

Limitations

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Missing, but Planned (or In Progress)

User Interface Designer

•Design tool for Kivy Language KV

•Planned for GSoC

Abstraction of mobile APIs

•Platform- independent Python wrapper for platform APIs (Android, iOS,

Linux/Mac/Windows)

• Project Plyer will start as GSoC project maybe

Porting to Raspberry Pi

•Useful for small/cheap standalone systems

•Founded via Crowdsourcing ( bountysource.com )

www.DLR.de • Chart 38 > droidcon 2013 > A. Schreiber • Developing Apps for Android and Other Platforms with Kivy and Python > 09.04.2013

Credits

Thanks to the Kivy developers

•Mathieu Virbel (@mathieuvirbel)

•Thomas Hansen ( @hansent )

•Gabriel Pettier ( @tshirtman )

•and many others

www.DLR.de • Chart 39 > droidcon 2013 > A. Schreiber • Developing Apps for Android and Other Platforms with Kivy and Python > 09.04.2013

> droidcon 2013 > A.

Schreiber • Developing

Apps for Android and

Other Platforms with Kivy

and Python > 09.04.2013

www.DLR.de • Chart 40

Questions?

Andreas Schreiber

Twitter: @onyame

http://www.dlr.de/sc

Summary

•Kivy allows platform- independent development of

apps for Android, iOS, Meego, Windows, OSX

and Linux

•Suitable for multi- touch and graphics applications,

such as kiosk systems, exhibits, games, …

... al 2009) project [12] . In their paper, "Developing App for Android and Other Platforms with Kivy and Python" Andreas Schreiber give a demonstration of Kivy-based application and sum-maries Kivy framework [11] kivy is most well known android supporting python toolkit has been since around 1012. kivy dose not specifically designed for mobile support but it focus on cross platform and supporting novel user interface this properties made it support android , IOS as well as desktop use [8]. it draw its GUI using openGL which working essentially same at all platform.kivy android support originally based on Renpy's Android build tool. it help to Create multi touch user interface and python UI framework for rapid development of mobile application [6] . ...

... We use the Kivy because its framework which support the python language and its very easy to integrate with python library[2] [11]. ...

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