Kotlin(Major)

Now Kotlin is main language for Android develop, now using Kotlin to develop app (Java discard)

Material Design

Now using Google lead material design for react UI, is not like traditional way. More flexible dev, theme, style, color and reaction etc.

Butter Knife

UI Base on Java, we use annotation way to find view and react UI event such as click event, text changed event.(Discard) Now is using kotlinx extension to get View element

Koin / Dagger2

To solve dependency injection problem and ensure our object can be reuse and singleton (Dagger2 discard)

RxJava2 / Coroutine

To solve between UI thread and Non-UI thread switch problem and easier switch by doing some action

Retrofit2

To easier implement Http/Https Restful API by annotation way

MVVM / MVP

Use view, view model (Koin inject) and repository design with live data pattern to struct our Android App (MVP model, view and presenter is discard)

Unit Test

Use Mockito, KoinTest and lifecycle simulate Android context, resource, sharedPreferences, lifecycle and dependency injection etc. To test view model function and make sure live data observe result callback success

Extension / KTX

Kotlin way to easier extension some specified class to do something

WebSocket

Use SignalR based on ASP.NET webSocket protocol to communicate between Android app and .net server; Also use Socket.IO which is popular webSocket based communicate between client and server

Git

Jenkins (CI/CD)

Unix Console

Based on Unix such as Ubuntu Linux based OS series and Mac OS can use console to do something

Shell-Script

XML

Java(Second opt)

Use Java 8 lambda language reduce coding line and use easy and short line to develop project, now is major in Kotlin develop

Firebase Service