Update: June 17, 2024 — The Jetpack Security crypto library has been deprecated. This means that it is no longer being actively developed or supported by Google. As a result, it is recommended that you migrate to a different library for your encryption needs. There are a number of alternative libraries available, such as: Android KeyStore: This is the built-in key store on Android devices. It prov

In part 2 of the Cancellation and Exceptions in Coroutines series, we learnt the importance of cancelling work when it’s no longer needed. On Android, you can use the CoroutineScopes provided by Jetpack: viewModelScope or lifecycleScope that cancel any running work when their scope completes — that is when the Activity/Fragment/Lifecycle completes. If you’re creating your own CoroutineScope, make

Every annotation has a point 🔍! Check out these cheat sheets to understand how Dagger interprets them and the code it generates for you. Explanations about the generated code and Dagger annotations can be found in the cheat sheets as comments. For more information about dependency injection, why you might use Dagger in your Android app, and how to use it, check out the official Android documentat

Over the past two years, I have regularly come across articles and libraries that attempt to improve how underline text decorations are rendered on the web. The same problem exist on Android: underline text decorations cross descenders. Compare how Android draws underlined text (top) and how it could be drawn instead (bottom): Which do you prefer?While I wholeheartedly approve of these efforts, I

新型コロナウイルスによって中止となった DroidKaigi 2020 にて2日目11:00より発表予定だった「詳解 WindowInsets」の資料です

The Android styling system offers a powerful way to specify your app's visual design, but it can be easy to misuse… Specifically we recommended using theme attributes to provide a point of indirection to resources, so that you can vary them (e.g. in dark theme). That is, if you find yourself writing a direct resource reference (or worse yet, a hardcoded value 😱) in a layout or style, consider if

A few days ago I started building a simple app to explore clean architecture a little bit. One of the features was for the user to be able to select two items and then take her/him to another screen. I didn’t want to spend time on implementing the multi-selection part so I decided to try the recyclerview-selection library. This article explains how I implemented it and the problems that I encounte

Proud father of two beautiful girls • Q'er @Q42. nerd • Android • Kotlin • fpv-drones • series • games

I’m sure there has often been a time when you’ve needed to send out an app update that has some form of urgency – maybe there’s a security issue or some bug which is causing a lot of issues for users. Previously, we’ve needed to roll out a new update on the Google play store and wait for our users to receive the update. And if they don’t have automatic updates installed, we rely on the user visiti

Dompter le chaos de l'information : Construire un Allié IA avec Langchain4J

This post has been updated multiple time since first publishing. The content is correct as-of April 26th 2019. The DayNight functionality in AppCompat allows your app to easily switch between a dark ⚫ and light ⚪ theme. This has many benefits for your users, from saving power on OLED displays, to increasing usability for people with reduced-vision, and more. How do I use it?You need to change your

Typical interaction of entities in an app built with Architecture ComponentsIdeally, ViewModels shouldn’t know anything about Android. This improves testability, leak safety and modularity. A general rule of thumb is to make sure there are no android.* imports in your ViewModels (with exceptions like android.arch.*). The same applies to presenters. ❌ Don’t let ViewModels (and Presenters) know abou

Room 2.1 adds support for Kotlin coroutines. DAO methods can now be marked as suspending to ensure that they are not executed on the main thread. Read on to see how to use this, how it works under the hood and how to test this new functionality. Add some suspense to your databaseTo use coroutines and Room in your app, update to Room 2.1 and add the new dependency to your build.gradle file: impleme

In this post we’ll dive into how to use them in your apps. VectorDrawable was introduced in Lollipop (API 21) and is also available in AndroidX (as VectorDrawableCompat) bringing support all the way back to API 14 (over 99% of devices). This post will outline advice for actually using VectorDrawables in your apps. AndroidX FirstFrom Lollipop onward, you can use VectorDrawables anywhere you would u