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agent-skills/skills/impeccable/reference/android.md
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naps62 9023ed3ef9 chore: update vendored skills and record provenance
humanizer 2.2.0 -> 2.9.1 (blader/humanizer, MIT): adds a Voice
Calibration section and a passive-voice pattern, reworks negative
parallelisms and em dashes. Version moved to metadata.version upstream.

impeccable 3.6.0 -> 4.0.4 (pbakaus/impeccable, Apache-2.0): the repo
tags the skill and the npm CLI separately, so 3.6.0 was a real release
and npm's 3.5.0 was never the comparison. Adds native-platform reference
briefs.

Each now carries an UPSTREAM file; bin/check-vendored.sh reports drift.
2026-08-01 14:25:26 +00:00

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Android platform

For native Android apps: Jetpack Compose, Android Views, React Native, Expo, Flutter shipping to Android hardware.

On native, the visitor mode narrows what expression may override. Material Design 3 governs structure, navigation, and interaction in every mode; brand expresses through Material's theming (color roles, type scale, shape, motion). A Material-everywhere cross-platform app that also ships to iPhone still owes iOS its OS guarantees on that hardware: safe-area insets, Reduce Motion, edge-swipe back.

The Android slop test

Would a fluent Android user trust this app, or trip on off-spec components? The most common tell is an iOS app wearing Android's skin: a bottom-only navigation copied from iPhone, a back arrow that ignores the system Back gesture, Cupertino-shaped switches and dialogs. Material 3 is the rulebook; follow its components and theme the brand through it.

Layout & structure

  • Material navigation, matched to size. Navigation bar (bottom, 35 destinations) on compact width; navigation rail or drawer on expanded width. Never ship a phone bottom-bar untouched on a tablet.
  • System Back always works. Honor the predictive Back gesture and Back button; never trap the user or hijack the gesture.
  • Edge-to-edge with window insets. Apply the status bar, navigation bar, display cutout, and IME insets so content never hides behind system bars or the keyboard.
  • Top app bar for screen context; pair with a FAB when the screen has a single primary action.

Touch targets

  • 48×48 dp minimum for every touch target, with at least 8 dp between them.

Typography

  • Material type scale. Display, Headline, Title, Body, Label roles (large/medium/small each). Map text to roles; never hand-pick sizes per screen.
  • Roboto is the system face; theme a brand face in through the type scale, keeping body, labels, and controls legible and consistent.
  • sp units, never fixed px, so type follows the system font-size setting.

Color & theming

  • Material color roles (primary, on-primary, surface, surface-variant, secondary-container, outline, error). Role tokens resolve light/dark and contrast variants automatically; raw hex breaks there.
  • Dynamic Color (Material You) where it fits: derive the scheme from the user's wallpaper on Android 12+, with a static fallback.
  • Dark theme is a first-class scheme. Design and test it; never a quick invert.
  • Tonal elevation. Convey elevation through the standard surface tonal levels (plus shadow where appropriate); no arbitrary drop shadows.

Components & motion

  • Material components. Buttons (filled / tonal / outlined / text), FAB, switches, chips, snackbars, bottom sheets, Material dialogs, navigation bar/rail/drawer. Never port iOS controls or invent equivalents.
  • One FAB, one primary action. Never stack FABs or spend one on a secondary task.
  • Snackbars for transient feedback (actionable when useful, never a toast for that); dialogs only for decisions that must interrupt.
  • Material motion patterns. Container transform, shared-axis, fade-through, with standard easing and durations; honor the system Remove animations setting with a crossfade or instant cut.