Android Accessibility Validator

Accessibility Validator (Android)

Checklist

TalkBack

• Interactive elements have contentDescription via semantics
• Decorative elements: Modifier.semantics { invisibleToUser() }
• Related elements: Modifier.semantics(mergeDescendants = true)
• contentDescription is localized
• Use Role (e.g., Role.Button, Role.Switch, Role.Checkbox) via semantics { role = Role.Button }
• Provide stateDescription for toggles/switches (e.g., "On", "Checked")
• Mark headings with semantics { heading() }
• Use onClickLabel for custom action descriptions
• Control traversal order with isTraversalGroup and traversalIndex when default order is insufficient
• Override defaults with clearAndSetSemantics { ... } for complex custom components

Dynamic Text

• Use sp for text sizes, not dp
• Use MaterialTheme.typography scales
• Layout adapts to large text sizes
• Support pinch-to-zoom scalable content with Modifier.transformable + state updates where appropriate

Color Contrast

• Text: 4.5:1 (normal), 3:1 (large 18sp+)
• Use Material Theme semantic colors
• Color not sole indicator

Touch Targets

• Minimum 48dp
• Use Modifier.minimumInteractiveComponentSize()

Testing

• Manual testing with TalkBack enabled
• Automated checks via enableAccessibilityChecks() in Compose tests

Quick Fixes

Severity

• 🔴 Critical: Blocks accessibility
• 🟡 Moderate: Reduces usability
• 🟢 Minor: Enhancement