Kenechukwu Akubue kengoon

Follow these steps to compile your kivy application to an APK on GitHub (No linux needed).

Note: This method is only recommended if you don't have access to a linux or mac system

Create an github account if you don't have.
Create a repository, you could also create it as private.
Goto your project directory (where main.py exists) and create a file in .github/workflows/build.yml (Create the folders if not already existed).

Many people state that kivy is slow. While this may be true it is mostly due to that python is slow to run on android devices.Thus it is in the programmer's hands to properly optimize their code so as to create a performant application.

Most of the lag on android devices runing kivy apps arise due to widget creation. Widget creation remains the slowest step in a kivy app. Here are some of the methods that I follow to optimize my apps and ensure I can hit 60fps even on old devices

Optimization Methods:

Source: AndroidDev

To get call history programmatically first add read contact permission in Manifest file:

<uses-permission android:name="android.permission.READ_CONTACTS" />

Create xml file. Add the below code in xml file:

<Linearlayout android:layout_height="fill_parent"

	from kivy import platform
	from jnius import autoclass
	if platform == "android":
	DataSnapshot = autoclass('com.google.firebase.database.DataSnapshot')
	HashMap = autoclass('java.util.HashMap')
	ArrayList = autoclass('java.util.ArrayList')
	Boolean = autoclass('java.lang.Boolean')
	String = autoclass('java.lang.String')
	Integer = autoclass('java.lang.Integer')
	Double = autoclass('java.lang.Double')

	from kivy.animation import Animation
	from kivy.app import App
	from kivy.lang import Builder
	from kivy.properties import AliasProperty, ColorProperty, NumericProperty
	from kivy.uix.effectwidget import AdvancedEffectBase, EffectWidget


	class TangentGradient(AdvancedEffectBase):
	def __init__(self, args, *kwargs):
	super().__init__(args, *kwargs)

	from kivy.uix.recycleview import RecycleView
	from kivy.clock import Clock
	from kivy.properties import OptionProperty, BooleanProperty, ObjectProperty, NumericProperty, ListProperty
	from kivy.animation import Animation
	from kivymd.uix.behaviors import StencilBehavior, SpecificBackgroundColorBehavior
	from kivymd.uix.boxlayout import MDBoxLayout
	from kivy.uix.widget import Widget

	from Components.effects import LowerScrollEffect, LowerDampedScrollEffect

	from kivy.event import EventDispatcher
	from kivy.metrics import dp
	from kivy.properties import ListProperty, StringProperty
	from kivymd.uix.behaviors import FakeRectangularElevationBehavior
	from kivymd.uix.card import MDCard
	from kivy.uix.behaviors import ToggleButtonBehavior

	from kivy.uix.gridlayout import GridLayout
	from kivy.uix.boxlayout import BoxLayout
	from kivy.uix.label import Label

	def luhn_checksum(card_number):
	def digits_of(n):
	return [int(d) for d in str(n)]
	digits = digits_of(card_number)
	odd_digits = digits[-1::-2]
	even_digits = digits[-2::-2]
	checksum = 0
	checksum += sum(odd_digits)
	for d in even_digits:
	checksum += sum(digits_of(d*2))

	BoxLayout:
	orientation: 'vertical'
	Label:
	size_hint_y: None
	height: '50dp'
	id: calc
	text: ''

	GridLayout:
	cols: 4

	[
	{
	"Country": {
	"Name": "Afghanistan",
	"ISOCode": "AF",
	"ISONumeric": "4"
	},
	"Ambulance": {
	"All": [
	"112"