Build Mobile Application With Kivy Python Framework

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Today, developers are probably working on a web or mobile applications. Python doesn’t have built-in mobile development capabilities, but there are packages that you can use to build mobile applications, such as Kivy, PyQt, and even Beeware’s Toga Library.

Build a Mobile Application With the Kivy Python Framework

All of these libraries play a major role in the Python mobile space. However, if you choose to use Kivy to build your mobile application, there are some benefits. Not only does the application look the same on all platforms, but it also does not require you to compile your code every time you make a change. You can also build your application using explicit Python syntax.

Installing Kivy

Kivy has many dependencies, so we recommend installing it in a Python virtual environment. You can use Python’s built-in venv library or the virtualenv package.

Here’s how to create a Python virtual environment:

$ python3 -m venv my_kivy_project

Working With Kivy Widgets

Puzzles are user-controlled on-screen controls. All GUI tools come with a set of widgets. Common puzzles you may have used include buttons, combo boxes, and tabs. Many widgets are built into the Kivy framework.

Displaying an Image

Kivy has several different widgets related to images. You can use Image to load a local image from your hard drive, or AsyncImage to load an image from a URL. In this example, we will stick to the default image class.

from import App

from kivy.uix.image import Image

class MainApp(App):

    def build(self):

        img = Image(source='/path/to/real_python.png',

                    size_hint=(1, .5),

                    pos_hint={'center_x':.5, 'center_y':.5})

        return img

if __name__ == '__main__':

    app = MainApp()

Enter the image from the kivy.uix.image subpackage into this code. The Image class takes many different parameters, but you want to use the source. Tell Kivy which image to upload. Here we pass the fully qualified path to the image.

Laying Out the UI

Each GUI framework you use has its way of organizing puzzles. For example, wxPython uses meters, while Tkinter uses layout or geometry managers. Kivy uses layouts. Several types of designs can be used. The most common are:

  • Box layout
  • Float layout
  • Schedule layout

See the Kivy documentation for a complete list of available designs. You can also search the actual source code on kivy.uix.

Read More: 6 Star Library For Profiling Python Code


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