As a freelance engineer, there are occasions when you are given a JPEG image from a client, and you want to convert it to a vector image with a transparent background to be development-ready. Here is one way to do it without spending a dime. Let’s say you are given…

Riverpod offers StreamProvider to manage streams, and in combination with rxdart, you can explore the deep sea of stream programming. For example, to scratch the surface of stream programming, receiving the latest combo of two different streams is very easy. import 'package:flutter_riverpod/flutter_riverpod.dart'; import 'package:rxdart/rxdart.dart'; final streamProviderA = StreamProvider<int>((ref) async* { yield*…

Both iOS and Android devices have accessibility settings that allow users to change devices’ text sizes. That is a great thing as a user, especially feeling age myself 😭. But as a mobile developer, that could sometimes be a pain, especially in the Flutter environment, where these settings are respected…

Issue Occasionally one of our Flutter Firebase project sent errors like this. “Crashlytics detected a missing dSYM for version …” What is a dSYM file? dSYM (short for “debugging symbols”) is a file format used on macOS and iOS operating systems to store debugging information. It provides some kind of mapping between the binary and the…

Floating Action Button (often abbreviated as FAB) is one of the killer elements of Material Design. It is not only eye-catching but is also great for enhancing usability on scrollview-based screens. Even though the standard appearance of the Floating Action Button is an icon with a circle background, located on…

Let’s say you configured your backend with Firebase and want to use a third-party service (e.g., Algolia to improve the search of Firestore). That third-party service would issue a private API key for you to safely use that service. …

Table of Contents: Overview Create different binary with different application ID for Android Create different binary with different bundle ID for iOS Set different launch icons for Flavors in Android Set different launch icons for Flavors in iOS Switch backend environments for different Flavors Switch Firebase environments for different Flavors Switch Firebase environments…

Sharing another simple lesson and insight learnt when chasing a mysterious issue In the last post, I shared a demonstration and a lesson that you always have to nil out instance variables in tearDown method in your XCTestCases. (You don’t need to go back to my last post if you…

Sharing a simple lesson and insight learnt when chasing a mysterious issue No stub for method `XXX()` In my workplace, recently we faced occasional test errors that happened only when run in test suite, even though individual test runs fine. No stub for method `XXX()` using parameters (). (NSInternalInconsistencyException) Certainly we have this Cuckoo stub…