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lukas-hinterleitner/visual-app-skills

flutter-test-android-visually

Run a Flutter app on a connected Android device or emulator, capture real screenshots via adb, read the Dart + logcat logs, and verify the visible UI and runtime behavior match what a recent code change intended.

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Flutter Android visual test

Interactive, on-device verification of a Flutter Android app — the "did my last change actually render correctly" check you'd otherwise do by squinting at an emulator. Builds and runs the app on a device or emulator, captures real screenshots via adb, reads the logs, and gives you enough evidence to answer did the change render correctly.

Works for any Flutter app, including multi-entry apps where the default entry point throws by design and a --target flag is mandatory. Android only — iOS needs a Mac and xcrun simctl, which is out of scope here.

When to use

  • "Test the app / run it on Android / see the visual changes."
  • "Did my UI fix work? Does this screen render correctly now?"
  • "Compare the capture screen to this Figma design." (optional Figma add-on)
  • Any request for empirical, on-device confirmation of a visual or runtime

change — even without the words "screenshot" or "logs".

How it works

  1. Follow `references/capture-loop.md` — the universal procedure: preflight,

launch in the background, wait for the first real frame, screenshot, capture logs, analyze the PNG against the change, report a verdict.

  1. For the Flutter specifics — the exact flutter run command and flags,

the first-frame log signal, where Flutter logs, hot reload, and cold-build timing — read references/flutter.md.

  1. To navigate the UI before screenshotting, see references/driving-the-ui.md.
  2. When something looks off, see references/troubleshooting.md.
  3. (Optional) compare to a Figma design → references/figma-comparison.md

(requires the Figma MCP server; skip entirely if you don't use Figma).

  1. Reached here with a non-Flutter Android app? See

references/other-frameworks.md or use the matching skill.

Bundled scripts

scripts/check-devices.sh, launch.sh, snap.sh, capture-logs.sh, stop.sh wrap the common adb/run commands with device disambiguation. capture-loop.md shows how they fit together.