Download Files in Kotlin for Android Using Ktor and Intents

Giving a user the ability to download files in your app can be difficult to figure out. In iOS, you can use AlamoFire to download the file locally and then present it with a UIDocumentInteractionController. (The code would look something like this.) It presents the documents, images, gifs, videos, etc. in the app for you, […]

Data Binding with Live Data for RecyclerView in Kotlin

When working on an app in Kotlin or Android, it’s very common to use RecyclerViews to display lists of information. Typically, this data will be built up in ViewModels and passed to a list adapter. This works fine for most things and allows interaction with the items. Usually, they don’t need to change directly in […]

Three Methods for Solving Android Data Binding Errors

Trying to figure out what is causing data binding errors when you compile your Android project? This post will save you a lot of time and frustration. There is nothing worse than the compiler telling you something’s wrong in your project but not telling you where. If you are getting cryptic errors like error: cannot […]

Adding Notification Badges to a Kotlin App

When building a Kotlin app, or any app for that matter, it’s pretty inevitable that it will contain push notifications. And with push notifications, it’s likely the app icon will need a badge. This is possible with the standard Android API, but unfortunately, the target SDK needs to be 26 or higher for it to […]

An Easy-to-Use TimePickerDialog for Kotlin

Android’s TimePickerDialog is fairly simple to use and works well if all you need to do is to choose hours and minutes. The problem is that you can’t restrict which times can be selected, set time intervals, allow seconds to be chosen, or style it in a meaningful way. The MaterialDateTimePicker library was made to […]

Building a Horizontal Picker or Spinner in Kotlin

A “picker” is a small scrollable list of defined values that looks like a combination lock with dials. It’s native to Swift. I think “spinner” would be a better name, because it looks like it spins. (Android has a “spinner,” but it’s really just a drop-down list. Annoying.) In this post, I will be showing […]

Getting Started Unit Testing with Kotlin

I’ve recently been playing around with Kotlin in my free time, particularly as an alternative to Java for Android development. Figuring out where to start exploring a new language can be difficult, but knowing that Atomic Object practices test-driven development (TDD), I figured that learning to test in Kotlin would be the best option.

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