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Accessibility testing for dev teams - No experience required
Compliance Data & Impact
Disabilities Affected
- Low Vision
- Mobility
- Cognitive
Requirement(s)
- Platform Violation
WCAG Success Criteria
- Not specified, or not applicable
Section 508 Guidelines
- 1194.31.f Motor/dexterity accessibility
- 1194.25.c Touch screen input method
- 1194.26.b Touch screen input method compliance
How to Fix the Problem
Generally, you want the touchable area of actionable touch target items in your app to be a minimum of 48dp x 48dp. Larger is even better.
Ensure that each actionable touch target items in your app has a large enough touch target, set the android:minWidth and android:minHeight attributes of each interactive item to 48dp or greater:
<ImageButton
...
android:minWidth="48dp"
android:minHeight="48dp" />You can also add padding or use the TouchDelegate API to increase the size of your items' touch targets without increasing the size of the items themselves.
Google's Accessibility Scanner looks for small touch targets likely to cause interaction difficulty for users with motor impairments. The touch target size identified is clickable and long-clickable Views that are smaller than 48dp x 48dp in either dimension or 32dp x 32dp for Views in input method windows or against the display edge.
Why it Matters
Many people have difficulty interacting with small touch targets on a device's screen. People are unique. Some fingers are larger than others. Some people have a motor or visual impairment.
Users with motor disabilities especially appreciate large touch targets. Some people experience hand tremors or imprecise hand movements. Other people cannot use their fingers at all, and must instead use other body parts, such as their knuckles, elbow, or toes. Touch targets that require appropriate sizes to accommodate all users include:
- Links
- Menus
- Checkboxes
- Radio Buttons
- Submit Buttons
- Custom widget controls (e.g., media player buttons)
Widgets that rely on gestures, touch events, and multi-touch actions are difficult to use by people who:
- cannot move their hands.
- do not have hands.
- have tremors in their hands.
- cannot see where to swipe or touch the screen.
- do not have a device with touchscreen or gesture capabilities.
Whenever you use touch or gesture methods, make sure you create actionable item touch targets big enough to enable interaction for people who cannot use them directly.
Rule Description
The Algorithm (in simple terms)
The Make Interactive Element Touch Targets Large rule detects actionable touch target items in a View that are too small for comfortable and accessible user interaction. The rule analyzes actionable touch target items in your app's Views. Actionable touch target items in your app set large enough for easily tapping by users pass the test. The rule is inapplicable to View items that are not intended for user interaction such as TextViews or plain text.
Resources
Deque University Course Pages (subscription required)
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