Calculator App Android Studio Kotlin Tutorial

How to create a simple calculator app using Android Studio and Kotlin. A great beginner programming project. In this example Android app we build a basic calculator from scratch, meaning that no external or 3rd party libraries are used.

In the first part of the tutorial we build a calculator grid layout using constraint view, linear layout and buttons. We also use styles to make managing the layout easier, if changes are required in the future.

In the second part of the tutorial we connect our buttons as well as implement all of the logic for our calculator be able to add, subtract, divide and multiply.

Calculator Source Code:

Java Android Studio Calculator:

⏱️ TIMESTAMPS ⏱️
00:00 - Intro
00:47 - Colors Themes
01:28 - Workings XML
02:30 - Calculator Grid XML
05:26 - Build Gradle
05:37 - Workings Kotlin
07:23 - Calculate Results Kotlin
11:43 - Calculator Test

#CalendarAppTutorial #LearnAndroidStudio #AppDevelopment

[wendiiyau]

⌫ 5:02 This is the symbol he uses, just copy paste it~

[crazydvae]

You made this tutorial AN ENTIRE 9 MONTHS after it was announced that the Android Kotlin Extensions Gradle plugin was no longer going to be supported?

[bramantawisnu]

i use 0.25 speed, , becouse that very fast, , like magic tric 😁

[hamzaakgun]

Honestly I loved the way you approached it and learned a lot from this video, even though it's not a long one.

[salomeshunamon]

kotlin-android-extensions is depreciated. Can you make an update video with how to change this finished project so that it's compatible?

[theblueplanet]

My takeaway from this video was using of styles. Thanks 🙏

[pradipbarvaliya]

awesome explanation and development thank you Cal

[reniac]

What do I do? <LinearLayout will not work for some reason even though I'm typing the code the exact same way

[meebolover]

My buttons are not calling the the style variables. They are just remaining default

[abeer]

Thaaank you You're a lifesaver..!

[vascocastel-branco]

hey, awesome video, but when you used the (" apply plugin: 'kotlin-android-extensions' ") it says it is no longer supported, what should I do to fix this? Thank you very much!!

[priyanshushrivastava]

sir i cant able to access workingsTV directly in main activity what is the solution sir?

[elnino]

Plugin with id 'kotlin-androids-extensions' not found.

[wiki-SMART]

I love you!.. Great work!.. Thank you!

[alanromero]

Buen video!! buenisimo!! saludos desde Argentina. Nuevo Sub :)

[muhammadmohsinnaeem]

workingTv is nnot funtional in my program

[HugoLopezDev]

Thanks for teaching this. New subscriber

[tnt_popcorn__]

I did the view binding but still not working. I almost give up

[Alvarez_Isaac]

Hey Cal, first of all. Thanks for your code and knowledge, it's been so helpful. I have a question about your code, I noticed that if you put the negative value first, it won't do the operation. For example: -99 + 1 and if you click the equal button, there will be no operation or just -1 and equal button, error too. Could you please give me some advice to fix this? Thanks anyway for your solution

[RaneemSarminy]

I named the file with the same file name and copied the code. I did not write it myself, but there are a lot of errors. Does anyone know the reason? error in workingsTV. There are yet other errors.