36 lines
2.1 KiB
Markdown
36 lines
2.1 KiB
Markdown
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## 3.10\. Accessibility
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Android provides an accessibility layer that helps users with disabilities to
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navigate their devices more easily. In addition, Android provides platform APIs
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that enable accessibility service implementations to receive callbacks for user
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and system events and generate alternate feedback mechanisms, such as
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text-to-speech, haptic feedback, and trackball/d-pad navigation.
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If device implementations support third-party accessibility services, they:
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* [C-1-1] MUST provide an implementation of the Android accessibility
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framework as described in the [accessibility APIs](
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http://developer.android.com/reference/android/view/accessibility/package-summary.html)
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SDK documentation.
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* [C-1-2] MUST generate accessibility events and deliver the appropriate
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`AccessibilityEvent` to all registered [`AccessibilityService`](
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http://developer.android.com/reference/android/accessibilityservice/AccessibilityService.html)
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implementations as documented in the SDK.
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* [C-1-4] MUST add a button in the system's navigation bar allowing the user
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to control the accessibility service when the enabled accessibility services
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declare the [`AccessibilityServiceInfo.FLAG_REQUEST_ACCESSIBILITY_BUTTON`](
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https://developer.android.com/reference/android/accessibilityservice/AccessibilityServiceInfo.html#FLAG%5FREQUEST%5FACCESSIBILITY%5FBUTTON)
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. Note that for device implementations with no system navigation bar, this
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requirement is not applicable, but device implementations SHOULD provide a
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user affordance to control these accessibility services.
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If device implementations include preinstalled accessibility services, they:
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* [C-2-1] MUST implement these preinstalled accessibility services as [Direct Boot Aware](
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https://developer.android.com/reference/android/content/pm/ComponentInfo.html#directBootAware)
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apps when the data storage is encrypted with File Based Encryption (FBE).
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* SHOULD provide a mechanism in the out-of-box setup flow for users to enable
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relevant accessibility services, as well as options to adjust the font size,
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display size and magnification gestures.
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