Kivy - Python UI Library for Any Platform

Introduction to Kivy

Introduction to Kivy

A Cross-Platform Python UI Library

In this Session we shall discuss:

How to setup kivy

Some key features of kivy

Make a simple Hello World application

Introduce the kv language

Package the application for the android market

Setting up Kivy

3 very simple commands:

Add Source

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

Update

sudo apt-get update

Install Kivy

sudo apt-get install python-kivy

Basic Components of Kivy

App

Widget

ScreenManger

Screen

Layouts

Button

Label

TextInput

Image

Clock

SoundLoader

Animation

Types of Layouts

Anchor Layout

Box Layout

Float Layout

Relative Layout

Grid Layout

Stack Layout

Hello World

from kivy.app import App

from kivy.uix.floatlayout import FloatLayout

from kivy.uix.button import Button

from kivy.uix.label import Label

class MyApp(App):

title = 'Hello World'

def build(self):

self.appwindow = FloatLayout()

button = Button(text = 'Click Here')

button.bind(on_release = self.buttonpress)

self.appwindow.add_widget(button)

return self.appwindow

def buttonpress(self,*args):

self.appwindow.clear_widgets()

self.appwindow.add_widget(Label(text = 'Hello World!'))

if __name__ == '__main__':

global myapp

myapp = MyApp()

myapp.run()

The kv Language

class MyButton(Button):

def __init__(self,**kwargs):

super(MyButton,self).__init__(**kwargs)

:size_hint_x: Nonesize_hint_y: None

In the kv file:

In the python file:

Packaging the app

There are two ways to package the app:

Manually using python-for-android

Automatically using buildozer

Prerequisites for manual packaging:

Build-Essential and others:

sudo apt-get install build-essential patch git-core ccache ant python-pip python-dev

Latest Cython:

Pip install upgrade cython

Android SDK

http://developer.android.com/sdk/index.html

Android NDK

http://developer.android.com/sdk/ndk/index.html

Environment variables

export ANDROIDSDK=/path/to/android-sdk

export ANDROIDNDK=/path/to/android-ndk

export ANDROIDNDKVER=rX

export ANDROIDAPI=X

export PATH=$ANDROIDNDK:$ANDROIDSDK/platform-tools:$ANDROIDSDK/tools:$PATH

Manually

Get python-for-android:

git clone git://github.com/kivy/python-for-android

Create distribution:

./distribute.sh -m "kivy"

Build apk:

cd dist/default

./build.py --dir

--name ""

--package

--version

--icon

--orientation

--permission (multiple allowed)

Automatic Packaging using buildozer:

Get buildozer:

git clone https://github.com/kivy/buildozer.git

cd buildozer

sudo python2.7 setup.py install

Create spec file:

cd path/to/app

buildozer init

Build:

buildozer android

Signing and Aligning
(Only for Release apk)

Generate keystore

keytool -genkey -v -keystore path/to/keystore/name.keystore -alias myalias -keyalg RSA -keysize 2048 -validity 10000

Sign using keystore

jarsigner -verbose -sigalg SHA1withRSA -digestalg SHA1 -keystore ./keystores/com-mydomain-myapp.keystore ./myapp/bin/MyApp-1.0.0-release-unsigned.apk myalias

Zipalign

~/.buildozer/android/platform/android-sdk-21/tools/zipalign -v 4 ./myapp/bin/MyApp-1.0.0-release-unsigned.apk ./myapp/bin/MyApp-1.0.0.apk

All Done!

Congratulations on your first apk!

Thank You!

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Kivy - Python UI Library for Any Platform

Presentations & Public Speaking

Transcript of Kivy - Python UI Library for Any Platform