Scientific calculators have a number of uses.For instance,they are majorly used to simplify arithmetic operations in supermarkets,shops,schools and even hospitals.This tutorial outlines step by step development of a scientific calculator using Jetpack and Kotlin in Android Studio.

To create a scientific calculator from scratch ensure the latest version of Android studio is installed in your computer.Create a new project by choosing 

.Write Scientific Calculator in the name field and click 

2.Ensure you add the required View model dependencies in build.gradle(.kts) in the app level module which comprises of:

3.Delete the code for Hello World logic.Next,add a class called

then create a CalculatorButton function with a string symbol,modifiers to control UI changes and onClick lambda to respond to click events.Additionally,add 

 composable and pass the modifier as a parameter and style it to achieve circular shape with 90dp 

Inside Box composable add Text composable with symbol, fontsize, color and Theme which is set to dark or light color.

4.Next is creating click events that will aid in clearing all content,deleting a single item,arithmetic options such as multiplication,division,addition and subtraction(x,/,+ and -).Moreover,add a click event that triggers when = sign is pressed and another for the Decimal point.Define these in a new Sealed Class called

5.Create a sealed class that will have all the operations including multiplication,division,addition, subtraction and operation.Pass the 

6.Add a data class that will allow tracking of states when user enter values in the calculator.Name the data Class

7.Create a viewModel that will ensure that states are not lost even if the screen is rotated.

8.Define the UI by styling the Items in the Layout in MainActivity and ensure that any custom colors are correctly defined in 

MainActivity code with styles for Calculator Layout

9.Finally add logic that will trigger the calculations in the CalculatorViewModel

Please use the knowledge  gathered in this tutorial,to build a scientific calculator for practice.This will enhance your understanding on concepts such as composables and  lambdas  in the context of Jetpack and Kotlin.


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Developing a scientific calculator using Jetpack and Kotlin

Wilson Ochieng

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