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 w3wiki')       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 :