Calculator-App | Basic Calculator App project demo | Apps library

I have a simple item-calculator-app. The items are stored using Async Storage. Therefore I have created the following class itemStorage.js

I'm a beginner doing Android Kotlin training.

I want to make the button redundant by adding listeners to all the inputs. The solution MainActivity.kt already has a listener for the text input "cost_of_service_edit_text": binding.costOfServiceEditText.setOnKeyListener.

How do you add a radio group listener with ActivityMainBinding?

The solution layout names the radio group "tip_options".

I tried adding binding.tipOptions.setOnClickListener{ _ -> handleEvent() }

which didn't crash but also didn't run the handleEvent() function, when I changed the selection in the radio group.

I'm following this tutorial on building a javascript calculator to learn a little more about web development. The CSS code below adds styling when pressing an operator (+, -, *, /) key. When an operator key is pressed, it should darken until another key is pressed to show that the operator is "active". However, when pressing the same operator key over and over again, there should still be some visual indication of the repeated clicking.

I am building a Budget-Calculator-App which should save the user data into chromes local storage. Idea is that everyone can use this app from his device whiteout a need of a database.

I am stuck on saving my whole data state into the local storage. I did a screenshot to show what i mean and what i get instead of the array of objects.

As you can see i am not getting the array saved and i don't know why.

Here is the code:

I want to make a scientific calculator.

I found some useful code on this site: http://www.androidauthority.com/build-a-calculator-app-721910/

Then i modified it for my purpose. In this code i found binding method was used so i made the following changes in my IDE as per the instructions on this site: https://developer.android.com/topic/libraries/data-binding/index.html

i made changes in the build.gradle(module app) and made changes in my MainActivity.java code also.

but the following error occurred:

MainActivity.java