material-components-android VS RxJava

It works with both. Components for the view system are available on Github.

By going to the Github doc of the material components lib, you can change branches and easily check when the design was updated. The latest release with the old design is 1.4 (see this doc).

TargetSDK is 33

[Tokens/Color] Added U color resources for contrast mode support.

You mean this one? https://github.com/material-components/material-components-android/blob/master/docs/components/Search.md

I'm not a dev, but I'm curious about this, cause I thought Material Components was made years ago as a library for devs to dynamically use said material components, so they would have an easier time updating their apps when the guidelines changed. Did I interpret it wrong?

Material Components has ToggleButton which does exactly what you want

It's probably worth filing an issue about it https://github.com/material-components/material-components-android/issues

3. RxJava This repository contains the source code for ReactiveX, a library used to create asynchronous and event-based programs with observable sequences. https://github.com/ReactiveX/RxJava

Is this similar RxJava, the reactive extensions library for https://github.com/ReactiveX/RxJava ? I have made that work in Clojure in production.

Since you mentioned java, there is RxJava and RxAndroid. Google general recommendation now is to use kotlin coroutines if you're considering writing your app with that.

It's very quick though. In terms of the correctness of the syntax, I've never seen an issue while translating a single file or a single function. When I took the entire RxJava code base 5 years ago, right clicked on the source folder and converted to Kotlin, I found lots of problems. File by file I've never seen any issues though, but I also haven't done it much.

You all beat me to MapStruct and Testcontainers. Honorable mention to RxJava, which I use in Desktop apps.

RxJava with RxRelay (and rx-combinetuple-kt)

RxJava2

More information about rxJava, check it out here: (HERE)[https://github.com/ReactiveX/RxJava]

Concurrency: Kotlin coroutines for general use, Rx or Flow for reactive programming (you can technically use Rx for regular concurrency as well, but not really what it's meant for)

If you're just looking at making a service call on a regular interval and notifying the user when there's an actual change in data, you can also look into RxJava https://github.com/ReactiveX/RxJava. From here you can "subscribe" to your service call, and then every time you make your service call you can have it look for changes compared to the previous emission .distinctUntilChanged() and then only notify it's subscribers when it notices an actual change. From there you can trigger a local notification and push to a LiveData (assuming MVVM) or otherwise update the UI to match as well.