YDMmobile / oss
KOEN

Keyword / 13 entries

flutter

Writing with this keyword. All writing

Category
  1. 1

    7 Silent Failures in My Flutter App That No Test Caught

    A token refresh that never ran, a crash filter that threw away crashes, and a test that defended a bug On 2026-10-03, four tests for a review screen in the Flutter app I maintain started failing. They couldn't find a snackbar. The snackbar was fine. The real error was this: The app decides whether it's running under…

    EN2026-10-21

  2. 2

    7 Flutter App Patterns Worth Copying Into Your Next App

    What a survey of my Riverpod + go_router app says to keep, and what to fix before you paste it My test harness has a doc comment that says (in Korean) it initializes ProviderScope, ScreenUtilInit and EasyLocalization. It does not wrap anything in EasyLocalization. Screen tests that use it had been running without…

    EN2026-10-19

  3. 3

    Upgrading to Flutter 3.47 Broke 4 Things in My App: The Checklist I Wish I'd Had

    Three failed loudly, one failed silently, and one of the loud ones was hiding in generated code On 2026-10-03 I opened my Flutter app under Flutter 3.47.6 stable for the first time. The app had last been built on an older SDK, and the first thing I saw was not a new feature. It was 111 test files that no longer…

    EN2026-10-18

  4. 4

    Receipt Scanning Is More Than Opening a Camera

    “Scan a receipt” sounds like one button. Behind that button are camera capture, gallery import, perspective crop, orientation normalization, pixel rotation, JPEG compression, EXIF extraction, OCR, cancellation, low-quality rejection, temporary-file lifetime, and two native platforms that disagree just enough to stay…

    EN2026-10-14

  5. 5

    Your Flutter Scripts Deserve Names

    Every Flutter project eventually grows a command nobody wants to type twice. It starts innocently: Then flags arrive. Platform-specific builds arrive. A native package needs a different working directory. Release preparation becomes three commands in a trench coat. Shell history remembers all of it, but shell history…

    EN2026-10-13

  6. 6

    The Widget Had the Right Width Factor and Rendered at 702 x 0

    The progress fill had widthFactor: 1.0. The widget test found it and confirmed the property. The full button remained tappable. The fill was also invisible. Flutter had laid it out at Size(702, 0). Technically, it occupied the full available width. It just did so with the vertical presence of a very committed line of…

    EN2026-10-01

  7. 7

    A Debug Log Is Not Allowed to Run Your Code

    Debug logging is supposed to observe a program. That sounds too obvious to deserve a rule. Then put a cursor on prefs in this line and ask a source-editing tool to “log what is under the cursor”: What should it insert? If the tool expands the selection to the widest nearby expression, it may generate this:…

    EN2026-08-12

  8. 8

    Balancing a Game Nobody Has Played Yet: Deterministic Autoplay, and the One Metric I Got Wrong

    Balancing a game usually works like this: you ship it, you wait, you watch a dashboard fill up with player deaths, and then you nudge a number and do it all again. That loop needs players. I did not have players. I had a tower-defense game I built in Flutter, an unreleased one, and a very specific question: is wave 20…

    EN2026-07-19

  9. 9

    The Checker That Lies: Why a Backgrounded Browser Can't Judge Your Game

    I was building a real-time Flutter game — a tower-defense thing with a deterministic simulation core and a CustomPaint renderer on top. The kind of project where "does it feel right?" is a real engineering question, not a vibe. Enemies walk a path, towers fire on a clock, and if the clock drifts by a few frames the…

    EN2026-07-19

  10. 10

    Teaching Your IDE to Show Icons: Inline SVG Previews in Dartdoc Comments

    Autocomplete on an icon font is a very specific kind of comedy. You type LucideIcons. and the IDE proudly offers you 2,023 options with names like pencilSparkles, beefOff, and squirrel. Which of these is the icon you saw in the design mock? No idea. Alt-tab to lucide.dev, search, squint, alt-tab back, pick,…

    EN2026-07-18

  11. 11

    Why 45992700 Is Not 459927: Longest-Prefix-First BIN Matching for Korean Cards

    Here is a small quiz. A user in Seoul types a card number that starts with 4599 2700. Your card-type detector looks at it and says, confidently: Visa. Is it wrong? No. Is it useful? Also no. In the Korean payments context, "Visa" is barely the beginning of the question. Which issuer — 신한카드? 현대카드? Is it a credit card…

    EN2026-07-18

  12. 12

    Publishing to pub.dev With Zero Stored Secrets: OIDC and Per-Package Tags for a Federated Flutter Plugin

    Every CI publishing pipeline I have ever set up began the same way: generate a long-lived token on the registry website, paste it into the repo's secret store, and promise myself I'd rotate it someday. (Narrator: he did not rotate it.) I've paid for that pattern before. On an earlier npm project, my tag-driven publish…

    EN2026-07-18