TL;DR: To write JVM unit test for Android build version, you can: Modify the build version field at runtime or Create a wrapper for build version checking. By the arrival of Android Q last year, Google has released 17 Android versions with many different APIs — that need to be…

TL;DR: The plus sign in “@+id/” tells Android build tools that you are declaring a new resource. And if it does not exist, add to R.java file. But basically, you don’t have to think, just use “@+id/” anywhere you want! In Android, when dealing with XML layouts, we come across…

Recently, I often get questions from university students like: “My coding skill is not too bad, but I often have to search on Google for code references — even with basic functions of programming language, don’t know if it’s terrible?” “I usually go to Stack Overflow to find solutions for…

TL;DR: You can create utils class by putting methods inside an object, or use package-level functions. If you’re integrating with Java code and need a true static utils method, you can put this method inside an object and annotate it with @JvmStatic. For the newcomers, Kotlin is a cross-platform, statically…

Today when preparing for the Computer Network exam, I would like to share some basic things about Private IP and Public IP.

Today I’m working on a school project of Software Design which need to use OOP, so I decide to write a small article about Constructor and Inheritance in C# When initializing new object of a subclass, constructor of the parent class will be called first, after that constructor of the…

TL;DR: You can manage your resources XML files (layout, drawable,..) better, by grouping them into separate subfolders corresponding to app’s features. Today when optimizing the codebase of my school project, I saw this:

If you can read this: You are not starving or lack food supply. You have attended at least one year of primary school education — that’s why you can read and write. Your country is not in a war. You have access to electricity. You have at least one electronic…

Virtual Machine? A virtual machine is based on computer architectures to provide functionality of a computer. There are 2 main types of Virtual Machine (VM): System virtual machines (full virtualization VMs) provide a substitute for a real machine. Process virtual machines are designed to execute computer programs in a platform-independent environment.