Kivy (framework)

Kivy is a free and open source Python framework for developing mobile apps and other multitouch application software with a natural user interface (NUI). It is distributed under the terms of the MIT License, and can run on Android, iOS, GNU/Linux, macOS, and Windows.

Kivy
The Kivy Showcase example
Developer(s)Kivy organization
Initial release1 February 2011 (2011-02-01)[1]
Stable release
1.11.1 / 19 July 2019 (2019-07-19)[2]
Preview release
2.0.0rc3 / 15 June 2020 (2020-06-15)
Repositorygithub.com/kivy/kivy
Written inPython, Cython
Operating systemCross-platform
TypeApplication framework
LicenseMIT (Free software)
Websitekivy.org

Kivy is the main framework developed by the Kivy organization,[3] alongside Python for Android,[4] Kivy iOS,[5] and several other libraries meant to be used on all platforms. In 2012, Kivy got a $5000 grant from the Python Software Foundation for porting it to Python 3.3.[6] Kivy also supports the Raspberry Pi which was funded through Bountysource.[7]

The framework contains all the elements for building an application such as:

Kivy is the evolution of the PyMT project, and is recommended for new projects.[9]

Code example

Here is an example of the Hello world program with just one button:

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

class TestApp(App):
    def build(self):
        return Button(text="Hello World")

TestApp().run()

Kv language

The Kv language is a language dedicated to describing user interface and interactions in Kivy framework. As with other user interface markup languages, it is possible to easily create a whole UI and attach interaction. For example, to create a Loading dialog that includes a file browser, and a Cancel / Load button, one could first create the base widget in Python and then construct the UI in Kv.

In main.py:

class LoadDialog(FloatLayout):
    def load(self, filename): pass
    def cancel(self): pass

And in the associated Kv:

#:kivy 1.11.1

<LoadDialog>:
    BoxLayout:
        size: root.size
        pos: root.pos
        orientation: "vertical"

        FileChooserListView:
            id: filechooser

        BoxLayout:
            size_hint_y: None
            height: 30

            Button:
                text: "Cancel"
                on_release: root.cancel()

            Button:
                text: "Load"
                on_release: root.load(filechooser.path, filechooser.selection)

Alternatively, the layout (here, Box Layout) and the buttons can be loaded directly in the main.py file.

Google Summer of Code

Kivy participated in Google Summer of Code under Python Software Foundation.

  • Kivy in GSoC'2014.[10]
  • Kivy in GSoC'2015.[11]
  • Kivy in GSoC'2016.[12]
  • Kivy in GSoC'2017.[13]

See also

References
  1. "Kivy changelog", kivy.org, retrieved 2016-04-05
  2. https://github.com/kivy/kivy/releases
  3. "About us", kivy.org
  4. "Python for Android", github.com
  5. "Kivy for iOS", github.com
  6. "Kivy and Python 3.3, project started", Google Groups
  7. "Kivy on Raspberry Pi", bountysource.com
  8. "Programming Guide ยป Kv language", kivy.org
  9. "FAQ: How is Kivy related to PyMT?", kivy.org, retrieved 2012-06-09
  10. "Google Summer of Code 2014 @ the Python Software Foundation".
  11. "Google Summer of Code 2015 @ the Python Software Foundation".
  12. "Google Summer of Code 2016 @ the Python Software Foundation".
  13. "Google Summer of Code 2017 @ the Python Software Foundation".
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