In general, you should send an AccessibilityEvent whenever the content of your custom view changes. For example, if you are implementing a custom slider bar that allows a user to select a numeric value by pressing the left or right arrows, your custom view should emit an event of type TYPE_VIEW_TEXT_CHANGED whenever the slider value changes. Which one of the following sample codes demonstrates the use of the sendAccessibilityEvent() method to report this event.
A. override fun dispatchPopulateAccessibilityEvent(event: AccessibilityEvent): Boolean { return super.dispatchPopulateAccessibilityEvent(event).let
{ completed -> if (text?.isNotEmpty() == true) { event.text.add(text) true } else { completed
}
}
}
B. override fun onKeyUp(keyCode: Int, event: KeyEvent): Boolean { return when(keyCode) { KeyEvent.KEYCODE_DPAD_LEFT -> { currentValue– sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_TEXT_CHANGED) true
}
…
}
}
C. override fun onKeyUp(keyCode: Int, event: KeyEvent): Boolean { return when(keyCode) { KeyEvent.KEYCODE_ENTER -> { currentValue– sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_CONTEXT_CLICKED) true
}
…
}
}
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