keyboard_suspend.kt

suspend fun Fragment.awaitKeyboardHidden() = suspendCancellableCoroutine<Unit> { cont ->
    if (!KeyboardVisibilityEvent.isKeyboardVisible(activity)) {
        cont.resume(Unit)
        return@suspendCancellableCoroutine
    }

    var unRegistrar: Unregistrar? = null
    unRegistrar = KeyboardVisibilityEvent.registerEventListener(activity) { open ->
        if (!open) { 
            // keyboard dismissed, time to resume coroutine
            unRegistrar?.unregister()
            unRegistrar = null
            cont.resume(Unit)
        }
    }

    // remove listener when the job is cancelled
    cont.invokeOnCancellation { unRegistrar?.unregister() }
}