A.I, Data and Software Engineering

Categoryfront-end

front-end development

WHY DO WE NEED TO OVERRIDE EQUALS AND HASHCODE METHODS IN JAVA/Kotlin

In this post, we will discuss why it is important to override equals and hashCode method in Java/Kotlin. Item 9 in Josh Bloch’s Effective Java suggests always override hashCode() method if the class overrides equals(). In this post, we will discuss why this is necessary and good practice.  We know that two objects are considered equal only if their references point...

Material Design — Custom Alert Dialog

Google did an amazing job to promote material design. However there is not many articles about how to quickly style the custom dialog. So, we will cover some missing stuff here. Prerequisites Add material design dependency in Gradle file: implementation "com.google.android.material:material:<latest-version>" Make sure your AppTheme inherited from a material theme like:...

Advanced android room persistent storage

Room provides an abstraction layer over SQLite to allow fluent database access while harnessing the full power of SQLite. Because Room takes care of several concerns for you, e.g. caching, networking, Android highly recommend using Room instead of SQLite. If you are coming from iOS, the good news is that Room is very similar to the core data in iOS development. The task Field...

Tutorial: Multi-touch gesture for android

Multi-touch gestures are very useful in many common scenarios, such as zooming, panning. For game development, handling multi-touch is essential. This post will give a quick guide for handling multi-touch points. Project structure We create a new project name MultiTouch with Java and add a new class named GameScene as a subclass of android.view.View. The basic GameScene class is as follows...

THE JOEL TEST quick note: 12 STEPS TO BETTER CODE

Recently, I came across a company’s profile and found their Joel test. Basically, it is for a better quality of software team/company. So I decided to share it here in the simplified version. The great part about it is that it takes about 3-5 minutes compared to approx 6 years to understand SEMA. The Joel Test Joel test questions The neat thing about The Joel Test is that it’s easy to get a...

A.I, Data and Software Engineering

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