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Use when designing or reviewing Android UI — applies Material Design 3 UX principles covering touch targets, spacing, navigation patterns, accessibility, animation timing, and platform conventions. Includes an M3 compliance audit that scores screens across 10 categories. Compleme
Use when designing or reviewing Android UI — applies Material Design 3 UX principles covering touch targets, spacing, navigation patterns, accessibility, animation timing, and platform conventions. Includes an M3 compliance audit that scores screens across 10 categories. Complements the compose skill with design-level decisions.
Source documentation, not instructions for this website. Review permissions before running any commands.
This reference covers the non-obvious platform facts and reviewing an existing screen for M3 compliance, not the basics of building M3-correct UI.
Foldables introduce postures beyond window size classes. Detect them with WindowInfoTracker + FoldingFeature (Jetpack WindowManager), and never place interactive content or critical information across the hinge.
| Posture | Detection | Layout behavior |
|---|---|---|
| Flat (unfolded) | no folding feature | Treat as Medium/Expanded by width |
| Half-opened, horizontal fold (tabletop) | HALF_OPENED + Orientation.HORIZONTAL | Content top half, controls bottom half |
| Half-opened, vertical fold (book) | HALF_OPENED + Orientation.VERTICAL | List left, detail right |
| Folded (cover screen) | — | Treat as Compact |
@Composable
fun FoldAwareLayout() {
val context = LocalContext.current
val layoutInfo by WindowInfoTracker.getOrCreate(context)
.windowLayoutInfo(context) // accepts @UiContext — Activity, InputMethodService, or createWindowContext()
.collectAsStateWithLifecycle(initialValue = WindowLayoutInfo(emptyList()))
val fold = layoutInfo.displayFeatures.filterIsInstance<FoldingFeature>().firstOrNull()
when {
fold?.state == FoldingFeature.State.HALF_OPENED ->
if (fold.orientation == FoldingFeature.Orientation.HORIZONTAL) TabletopLayout() else BookLayout()
else -> StandardAdaptiveLayout() // by window size class
}
}
Compose's dynamicLightColorScheme / dynamicDarkColorScheme read the system contrast setting automatically (SDK 34+) and expose no contrast parameter. To offer in-app contrast control (Standard 0.0 / Medium 0.5 / High 1.0 tonal distance), build the scheme from Hct + SchemeContent:
// com.google.android.material:material (MDC-Android), package com.google.android.material.color.utilities
// Marked @RestrictTo(LIBRARY_GROUP) — internal API, may change between versions; re-check on version bumps.
val hct = Hct.fromInt(0xFF6750A4.toInt())
val scheme = SchemeContent(hct, /* isDark = */ false, /* contrastLevel = */ 1.0)
val colorScheme = lightColorScheme(
primary = Color(scheme.primary),
onPrimary = Color(scheme.onPrimary),
// ... map remaining roles
)
For multiplatform or a stable public API, com.materialkolor:material-color-utilities is a KMP alternative.
Pair M3's duration ladder with easing (short* → FastOutSlowIn; medium* → Emphasized(De/Ac)celerate; long*/extraLong* → Emphasized) rather than arbitrary millis. Reach for MotionScheme (Compose M3 1.4+) where available; otherwise hold durations at one source of truth in the theme.
| Token group | Range | Typical use |
|---|---|---|
short1…short4 | 50–200ms | Micro-interactions, state changes (ripple, selection, switch) |
medium1…medium4 | 250–400ms | Standard transitions (screen enter/exit, expansion, reveal) |
long1…long4 | 450–600ms | Container transforms, fade-through between large surfaces |
extraLong1…extraLong4 | 700–1000ms | Shared-element / hero transitions on tablets/foldables |
Animations must be interruptible and never block input. Respect reduced motion — Compose has no built-in LocalReducedMotion, so read ANIMATOR_DURATION_SCALE and provide one:
val LocalReducedMotion = staticCompositionLocalOf { false }
@Composable
fun AppTheme(content: @Composable () -> Unit) {
val context = LocalContext.current
val reduceMotion = remember {
Settings.Global.getFloat(context.contentResolver, Settings.Global.ANIMATOR_DURATION_SCALE, 1f) == 0f
}
CompositionLocalProvider(LocalReducedMotion provides reduceMotion) { MaterialTheme { content() } }
}
// at the call site
AnimatedVisibility(
visible = isVisible,
enter = if (LocalReducedMotion.current) EnterTransition.None else fadeIn() + slideInVertically(),
) { Content() }
(staticCompositionLocalOf + keyless remember read the setting once per Activity; for live updates switch to compositionLocalOf + a ContentObserver on ANIMATOR_DURATION_SCALE.)
Use this when reviewing a screen or feature for Material Design 3 compliance — the part that's easy to skip from memory. Score each category Pass / Partial / Fail, then fix any Partial/Fail before shipping.
MaterialTheme.colorScheme roles — no hardcoded hex/ARGB.primary for key actions, secondary/tertiary for less prominent / accents, error for errors; on* paired correctly; layered surfaces via surfaceContainerLow/High, not arbitrary grays.outline for interactive boundaries needing 3:1 (field borders, focus rings), outlineVariant for decorative dividers.MaterialTheme.typography — no inline fontSize/fontWeight.display* hero, headline* section headers, title* card/dialog titles, body* content, label* buttons/captions.MaterialTheme.shapes, not hardcoded RoundedCornerShape.extraSmall (4dp) chips, small (8dp) cards, medium (12dp) dialogs, large (16dp) sheets, extraLarge (28dp) FABs. Consistent shape language.ElevatedCard/ElevatedButton over manual shadowElevation.surfaceContainerLowest < … < Highest) — if two adjacent layers render the same color in either theme, the elevation cue is broken.androidx.compose.material3.*), no M2 (androidx.compose.material.*) and no M2/M3 mixing on a screen.FloatingActionButton for the primary action, Card for grouped content, TopAppBar for screen-level actions.Run from the project root — each hit is a category-1/3/5 violation to triage before human review:
rg --type kt 'Color\(0x[0-9a-fA-F]{6,8}\)' --files-with-matches | head # 1: hardcoded colors
rg --type kt 'RoundedCornerShape\(\s*\d+(?:\.\d+)?\s*\.dp\s*\)' --files-with-matches | head # 3: hardcoded radii
rg --type kt 'import androidx\.compose\.material\.' --files-with-matches | head # 5: Material 2 imports
selected + active indicator.Emphasized at 300–500ms; enter/exit follow M3 (fade-through, container transform); interruptible and respect reduced motion.contentDescription; contrast meets WCAG AA (4.5:1 body, 3:1 large text + UI components); touch targets ≥48dp.semantics(mergeDescendants = true) so TalkBack announces them as one unit (icon contentDescription = null when merged).semantics { heading() } so screen-reader users can jump between sections.semantics { traversalIndex } where needed). User-controlled contrast (Standard/Medium/High) considered if supported.MaterialTheme (no nested/conflicting themes); light + dark both tested; custom theme extensions via CompositionLocal, not globals; brand colors via a custom ColorScheme, not per-component overrides.Screen: [name] Date: [date]
| # | Category | Score | Notes |
|---|---------------------|---------|------------------------|
| 1 | Color tokens | Pass | |
| 2 | Typography | Partial | bodySmall hardcoded |
| 5 | Components | Fail | M2 Scaffold still used |
| 6 | Layout & spacing | Partial | No tablet breakpoint |
| 9 | Accessibility | Partial | Missing headings |
…
Action items:
- [ ] ...
name: android-ux description: Use when designing or reviewing Android UI — applies Material Design 3 UX principles covering touch targets, spacing, navigation patterns, accessibility, animation timing, and platform conventions. Includes an M3 compliance audit that scores screens across 10 categories. Complements the compose skill with design-level decisions.
---
name: android-ux
description: Use when designing or reviewing Android UI — applies Material Design 3 UX principles covering touch targets, spacing, navigation patterns, accessibility, animation timing, and platform conventions. Includes an M3 compliance audit that scores screens across 10 categories. Complements the compose skill with design-level decisions.
---
# Android UX
This reference covers the non-obvious platform facts and **reviewing** an existing screen for M3 compliance, not the basics of building M3-correct UI.
## Non-obvious platform facts
### Foldable postures
Foldables introduce postures beyond window size classes. Detect them with `WindowInfoTracker` + `FoldingFeature` (Jetpack WindowManager), and **never place interactive content or critical information across the hinge**.
| Posture | Detection | Layout behavior |
|---|---|---|
| Flat (unfolded) | no folding feature | Treat as Medium/Expanded by width |
| Half-opened, horizontal fold (tabletop) | `HALF_OPENED` + `Orientation.HORIZONTAL` | Content top half, controls bottom half |
| Half-opened, vertical fold (book) | `HALF_OPENED` + `Orientation.VERTICAL` | List left, detail right |
| Folded (cover screen) | — | Treat as Compact |
```kotlin
@Composable
fun FoldAwareLayout() {
val context = LocalContext.current
val layoutInfo by WindowInfoTracker.getOrCreate(context)
.windowLayoutInfo(context) // accepts @UiContext — Activity, InputMethodService, or createWindowContext()
.collectAsStateWithLifecycle(initialValue = WindowLayoutInfo(emptyList()))
val fold = layoutInfo.displayFeatures.filterIsInstance<FoldingFeature>().firstOrNull()
when {
fold?.state == FoldingFeature.State.HALF_OPENED ->
if (fold.orientation == FoldingFeature.Orientation.HORIZONTAL) TabletopLayout() else BookLayout()
else -> StandardAdaptiveLayout() // by window size class
}
}
```
### M3 contrast levels (user-controlled contrast)
Compose's `dynamicLightColorScheme` / `dynamicDarkColorScheme` read the system contrast setting automatically (SDK 34+) and expose **no** contrast parameter. To offer *in-app* contrast control (Standard 0.0 / Medium 0.5 / High 1.0 tonal distance), build the scheme from `Hct` + `SchemeContent`:
```kotlin
// com.google.android.material:material (MDC-Android), package com.google.android.material.color.utilities
// Marked @RestrictTo(LIBRARY_GROUP) — internal API, may change between versions; re-check on version bumps.
val hct = Hct.fromInt(0xFF6750A4.toInt())
val scheme = SchemeContent(hct, /* isDark = */ false, /* contrastLevel = */ 1.0)
val colorScheme = lightColorScheme(
primary = Color(scheme.primary),
onPrimary = Color(scheme.onPrimary),
// ... map remaining roles
)
```
For multiplatform or a stable public API, `com.materialkolor:material-color-utilities` is a KMP alternative.
### Motion: duration tokens + reduced motion
Pair M3's duration ladder with easing (`short*` → `FastOutSlowIn`; `medium*` → `Emphasized(De/Ac)celerate`; `long*`/`extraLong*` → `Emphasized`) rather than arbitrary millis. Reach for `MotionScheme` (Compose M3 1.4+) where available; otherwise hold durations at one source of truth in the theme.
| Token group | Range | Typical use |
|---|---|---|
| `short1`…`short4` | 50–200ms | Micro-interactions, state changes (ripple, selection, switch) |
| `medium1`…`medium4` | 250–400ms | Standard transitions (screen enter/exit, expansion, reveal) |
| `long1`…`long4` | 450–600ms | Container transforms, fade-through between large surfaces |
| `extraLong1`…`extraLong4` | 700–1000ms | Shared-element / hero transitions on tablets/foldables |
Animations must be interruptible and never block input. **Respect reduced motion** — Compose has no built-in `LocalReducedMotion`, so read `ANIMATOR_DURATION_SCALE` and provide one:
```kotlin
val LocalReducedMotion = staticCompositionLocalOf { false }
@Composable
fun AppTheme(content: @Composable () -> Unit) {
val context = LocalContext.current
val reduceMotion = remember {
Settings.Global.getFloat(context.contentResolver, Settings.Global.ANIMATOR_DURATION_SCALE, 1f) == 0f
}
CompositionLocalProvider(LocalReducedMotion provides reduceMotion) { MaterialTheme { content() } }
}
// at the call site
AnimatedVisibility(
visible = isVisible,
enter = if (LocalReducedMotion.current) EnterTransition.None else fadeIn() + slideInVertically(),
) { Content() }
```
(`staticCompositionLocalOf` + keyless `remember` read the setting once per Activity; for live updates switch to `compositionLocalOf` + a `ContentObserver` on `ANIMATOR_DURATION_SCALE`.)
---
## M3 Compliance Audit
Use this when **reviewing** a screen or feature for Material Design 3 compliance — the part that's easy to skip from memory. Score each category **Pass / Partial / Fail**, then fix any Partial/Fail before shipping.
### 1. Color tokens
- All colors reference `MaterialTheme.colorScheme` roles — no hardcoded hex/ARGB.
- Correct role usage: `primary` for key actions, `secondary`/`tertiary` for less prominent / accents, `error` for errors; `on*` paired correctly; layered surfaces via `surfaceContainerLow/High`, not arbitrary grays.
- Outlines: `outline` for interactive boundaries needing 3:1 (field borders, focus rings), `outlineVariant` for decorative dividers.
- Dynamic color on Android 12+ with a static fallback.
### 2. Typography
- All text from `MaterialTheme.typography` — no inline `fontSize`/`fontWeight`.
- Correct scale: `display*` hero, `headline*` section headers, `title*` card/dialog titles, `body*` content, `label*` buttons/captions.
### 3. Shape
- Corner radii from `MaterialTheme.shapes`, not hardcoded `RoundedCornerShape`.
- Scale: `extraSmall` (4dp) chips, `small` (8dp) cards, `medium` (12dp) dialogs, `large` (16dp) sheets, `extraLarge` (28dp) FABs. Consistent shape language.
### 4. Elevation & surface
- Elevation via **tonal color** (surface containers), not drop shadows; shadow elevation reserved for dialogs/menus/FABs.
- `ElevatedCard`/`ElevatedButton` over manual `shadowElevation`.
- Container hierarchy monotonic by tone (`surfaceContainerLowest < … < Highest`) — if two adjacent layers render the same color in either theme, the elevation cue is broken.
### 5. Components
- M3 components (`androidx.compose.material3.*`), no M2 (`androidx.compose.material.*`) and no M2/M3 mixing on a screen.
- Used as intended: `FloatingActionButton` for the primary action, `Card` for grouped content, `TopAppBar` for screen-level actions.
### Quick grep checks
Run from the project root — each hit is a category-1/3/5 violation to triage before human review:
```bash
rg --type kt 'Color\(0x[0-9a-fA-F]{6,8}\)' --files-with-matches | head # 1: hardcoded colors
rg --type kt 'RoundedCornerShape\(\s*\d+(?:\.\d+)?\s*\.dp\s*\)' --files-with-matches | head # 3: hardcoded radii
rg --type kt 'import androidx\.compose\.material\.' --files-with-matches | head # 5: Material 2 imports
```
### 6. Layout & spacing
- 8dp grid for padding/margins; responsive compact/medium/expanded breakpoints; screen maps to a canonical layout (Feed, List-Detail, Supporting Pane).
- **Content width constrained on wide screens** — cap body content at ~840–1040dp on Large and center it; full width is for navigation chrome, not paragraphs.
- Foldable postures handled (no content across the hinge; tabletop/book layouts where relevant).
- Dialogs centered (not full-screen) on Medium+; bottom sheets convert to side sheets on Expanded+.
### 7. Navigation
- Navigation component matches width (Bottom Bar / Rail / Drawer); items have **both icon and label**; current destination indicated via `selected` + active indicator.
### 8. Motion
- Transitions use M3 easing + duration tokens; shared elements use `Emphasized` at 300–500ms; enter/exit follow M3 (fade-through, container transform); interruptible and **respect reduced motion**.
### 9. Accessibility
- Meaningful images/icons have `contentDescription`; contrast meets WCAG AA (4.5:1 body, 3:1 large text + UI components); touch targets ≥48dp.
- **Composite items merged** with `semantics(mergeDescendants = true)` so TalkBack announces them as one unit (icon `contentDescription = null` when merged).
- **Section titles marked** `semantics { heading() }` so screen-reader users can jump between sections.
- Traversal order logical (`semantics { traversalIndex }` where needed). User-controlled contrast (Standard/Medium/High) considered if supported.
### 10. Theming consistency
- Single `MaterialTheme` (no nested/conflicting themes); light + dark both tested; custom theme extensions via `CompositionLocal`, not globals; brand colors via a custom `ColorScheme`, not per-component overrides.
### Audit summary template
```
Screen: [name] Date: [date]
| # | Category | Score | Notes |
|---|---------------------|---------|------------------------|
| 1 | Color tokens | Pass | |
| 2 | Typography | Partial | bodySmall hardcoded |
| 5 | Components | Fail | M2 Scaffold still used |
| 6 | Layout & spacing | Partial | No tablet breakpoint |
| 9 | Accessibility | Partial | Missing headings |
…
Action items:
- [ ] ...
```
Skill source recorded
Skill instructions are recorded. This is not a runtime test, safety guarantee or compatibility certification.
Review before install: Avoid automatic install
License: MIT
Listed tools are metadata hints, not tested compatibility. Agent prompts are suggested handoffs.
Check the source for dependencies, API keys and third-party costs. A public repository does not mean every service is free.
Repository metadata and review signals are advisory. Popularity, source discovery and successful execution are different facts.
Version reported in registry metadata; check source releases before relying on it.
Quality
68/100
Promising
Trust
65/100
This page exposes the same decision, trust, audit, use-case, and install signals through the Registry API, so agents can rank this skill without scraping the UI.
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},
"alternative_skills": [],
"do_not_use_when": [
"teams that need a vendor-supported SLA",
"high-compliance environments without internal security review",
"No OpenAgentSkill engagement data yet",
"High-risk permission hints: Shell or command execution, Secrets or environment access",
"Dependency or permission surface needs review",
"Permission surface may require sandboxing",
"Quality score needs review",
"Permission surface needs review: secrets or environment access, shell or command execution"
],
"agent_contract": {
"task_input": "Use android-ux in an agent workflow",
"recommended_action": "Do not auto-install. Inspect the source, dependencies, and permission surface first.",
"install_policy": "block",
"minimum_review_before_use": [
"Trust: 73/100 Strong shortlist",
"Audit: 78/100 Needs review",
"Safety: 38/100 Avoid automatic install",
"Review repository, license, install command, and permission surface before production use."
],
"expected_agent_output": {
"selected_skill": "rcosteira79-android-ux (android-ux)",
"install_command": "npx skills add rcosteira79/android-skills --skill android-ux",
"risk_summary": "Needs review; Blocked for auto-install; Review before production",
"verification_result": "Report the smallest successful task, files touched, warnings, and any missing setup."
}
},
"outcome_feedback": {
"endpoint": "https://www.openagentskill.com/api/agent/outcome",
"method": "POST",
"requires_resolve_event_id": true,
"event_id_source": "Use install_receipt.outcome_feedback.event_id or feedback.event_id returned by /api/agent/resolve for the current task.",
"expected_outcomes": [
"success",
"failed",
"not_relevant",
"blocked_by_risk",
"setup_required"
],
"payload_template": {
"event_id": "<install_receipt.outcome_feedback.event_id or feedback.event_id from /api/agent/resolve>",
"skill_slug": "rcosteira79-android-ux",
"task": "Use android-ux in an agent workflow",
"agent": "codex",
"outcome": "success",
"install_used": true,
"risk_blocked": false,
"setup_required": false,
"task_success": true,
"output_quality": 4,
"error_type": null,
"human_review_required": false,
"workspace": "sandbox",
"time_to_useful_ms": 120000,
"notes": "Report the smallest successful task, setup friction, files touched, and risk notes."
}
},
"endpoints": {
"web": "https://www.openagentskill.com/skills/rcosteira79-android-ux",
"api": "https://www.openagentskill.com/api/agent/skills/rcosteira79-android-ux",
"audit": "https://www.openagentskill.com/skills/rcosteira79-android-ux/audit",
"eval": "https://www.openagentskill.com/api/agent/evals?slug=rcosteira79-android-ux&task=Use%20android-ux%20in%20an%20agent%20workflow&max_risk=medium",
"resolve": "https://www.openagentskill.com/api/agent/resolve?task=Use%20android-ux%20in%20an%20agent%20workflow&agent=codex&max_risk=medium",
"receipt": "https://www.openagentskill.com/api/agent/receipt?task=Use%20android-ux%20in%20an%20agent%20workflow&agent=codex&max_risk=medium&format=text",
"install": "https://www.openagentskill.com/api/skills/rcosteira79-android-ux/install",
"manifest": "https://www.openagentskill.com/api/registry/manifest/rcosteira79-android-ux"
}
}Listing source
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Audit
78/100
Needs review
Copies are not installs. Installation counts require a reported successful installation; they are not a blanket quality guarantee.