Kivy – Python Framework for Mobile App development

Kivy is a free and open-source Python library used for developing mobile applications and other multitouch application software with a Natural User Interface.

Installation

We can download the latest version of Kivy from here. After opening the link you can choose your Platform and follow the instructions specific for your platform.

Installation using PyCharm

1. We will open PyCharm and Create a New Project and Name it as “Tutorial”(Project Name), we can Name as we want.
2. We will Right click on “Tutorial”(Project Name) and create a new Directory Named as FirstApp.
3. Inside this FirstApp We will create a Python file named as Main.

To install Kivy follow:

1. Goto File->Settings->Project:Tutorial(Project Name).
2. Under Project: Tutorial(Project Name), Click on Project Interpreter.
3. Then Click on ‘+’ Sign on top right and Search for Kivy you will see the following Screen:
   

Installing Kivy Dependencies

Similarly Click on the following dependencies to install them :

• kivy-deps.angle
• kivy-deps.glew
• kivy-deps.gstreamer
• kivy-deps.sdl2

Example 1 : Printing Welcome Message on Kivy App

# import the modules
from kivy.app import App
from kivy.uix.label import Label

# defining the Base Class of our first Kivy App
class MyApp(App):

    def build(self):

        # initializing a Label with text ‘Hello World’
        and return its instance
        return Label(text = 'welcome to GeeksforGeeks')


if __name__ == '__main__':
    # MyApp is initialized and its run() method called
    MyApp().run()

Output :


Example 2 : Creating Login Screen

# importing the modules
from kivy.app import App
from kivy.uix.gridlayout import GridLayout
from kivy.uix.label import Label
from kivy.uix.textinput import TextInput

# this class is used as a Base for our
# Root Widget which is LoginScreen
class LoginScreen(GridLayout):

    # overriding the method __init__() so as to
    # add widgets and to define their behavior
    def __init__(self, **kwargs):
        super(LoginScreen, self).__init__(**kwargs)

        # GridLayout managing its children in two columns
        # and add a Label and a TextInput for the Email id and password
        self.cols = 2
        self.add_widget(Label(text = 'Email id'))
        self.username = TextInput(multiline = False)
        self.add_widget(self.username)
        self.add_widget(Label(text = 'password'))
        self.password = TextInput(password = True, multiline = False)
        self.add_widget(self.password)

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


if __name__ == '__main__':

    # MyApp is initialized and
    # its run() method called
    MyApp().run()

Output :