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.

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
}
…
}
}

View Answer

Answer: B

Explanation:

Reference: https://developer.android.com/guide/topics/ui/accessibility/custom-views