Cara Mudah Membangun Aplikasi Android dengan Python Kivy

Membangun Aplikasi Android dengan Python Kivy - Sebelumnya sudah dijelaskan cara install kivy di windows, kali ini kita akan bahas cara membangun aplikasi android dengan python kivy di windows.

Kivy adalah alat GUI platform-independen dengan Python. Karena dapat dijalankan di Android, IOS, linux dan Windows dll. Pada dasarnya digunakan untuk mengembangkan aplikasi Android, tetapi bukan berarti tidak dapat digunakan pada aplikasi Desktop.

Pada artikel ini, kita akan belajar cara mudah membuat kalkulator sederhana menggunakan Python Kivy.

Sebelum membuat program Kalkulator ini disarankan untuk memiliki pengetahuan dasar-dasar matematika, Python, Kivy, Widget dan Pengetahuan Dasar Kivy.

Step-step untuk membuat kalkulator:

1) import kivy

2) import kivyApp

3) import Gridlayout

4) import config (untuk mengkonfigurasi/menyesuaikan ukuran window)

5) Tetapkan versi minimum (opsional)

6) create Layout class: tentukan fungsi Kalkulator di dalamnya

         : Dalam hal ini saya menggunakan try-catch karena jika ada aritmatika

            pengecualian terjadi itu akan melalui kesalahan

7) create App class

8) buat file .kv (nama file .kv nya sama dengan app class):

        1) create buttons/tombol

        2) Tambahkan style pada buttons/tombol

        3) Tambahkan fungsi buttons/tombol

9) Return Layout/widget/class (sesuai kebutuhan)

10) Run Instance class

Ada 2 file yang akan kita buat. Yang pertama Main.py dan Kalkulator.kv

Berikut listing Main.py

# Program to create a calculator

# Program to Show how to create a switch

# import kivy module

import kivy

# base Class of your App inherits from the App class.

# app:always refers to the instance of your application

from kivy.app import App

# this restrict the kivy version i.e

# below this kivy version you cannot

# use the app or software

kivy.require('1.9.0')

# for making multiple buttons to arranging

# them we are using this

from kivy.uix.gridlayout import GridLayout

# for the size of window

from kivy.config import Config

# Setting size to resizable

Config.set('graphics', 'resizable', 1)

## Config.set('graphics', 'width', '400')

## Config.set('graphics', 'height', '400')

# Creating Layout class

class CalcGridLayout(GridLayout):

# Function called when equals is pressed

def calculate(self, calculation):

if calculation:

try:

# Solve formula and display it in entry

# which is pointed at by display

self.display.text = str(eval(calculation))

except Exception:

self.display.text = "Error"

# Creating App class

class CalculatorApp(App):

def build(self):

return CalcGridLayout()

# creating object and running it

calcApp = CalculatorApp()

calcApp.run()

Listing Kalkulator.kv

# Custom button

<CustButton@Button>:

font_size: 32

# Define id so I can refer to the CalcGridLayout

# class functions

# Display points to the entry widget

<CalcGridLayout>:

id: calculator

display: entry

rows: 6

padding: 10

spacing: 10

# Where input is displayed

BoxLayout:

TextInput:

id: entry

font_size: 32

multiline: False

# When buttons are pressed update the entry

BoxLayout:

spacing: 10

CustButton:

text: "7"

on_press: entry.text += self.text

CustButton:

text: "8"

on_press: entry.text += self.text

CustButton:

text: "9"

on_press: entry.text += self.text

CustButton:

text: "+"

on_press: entry.text += self.text

BoxLayout:

spacing: 10

CustButton:

text: "4"

on_press: entry.text += self.text

CustButton:

text: "5"

on_press: entry.text += self.text

CustButton:

text: "6"

on_press: entry.text += self.text

CustButton:

text: "-"

on_press: entry.text += self.text

BoxLayout:

spacing: 10

CustButton:

text: "1"

on_press: entry.text += self.text

CustButton:

text: "2"

on_press: entry.text += self.text

CustButton:

text: "3"

on_press: entry.text += self.text

CustButton:

text: "*"

on_press: entry.text += self.text

# When equals is pressed pass text in the entry

# to the calculate function

BoxLayout:

spacing: 10

CustButton:

text: "AC"

on_press: entry.text = ""

CustButton:

text: "0"

on_press: entry.text += self.text

CustButton:

text: "="

on_press: calculator.calculate(entry.text)

CustButton:

text: "/"

on_press: entry.text += self.text

BoxLayout:

CustButton:

font_size: 20

text: "Scientific calculator"

on_press: entry.text = ""

Output Program akan seperti berikut :

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