public void SetAnnouncement(string text)
{
AccessibilityManager manager = (AccessibilityManager)Android.App.Application.Context.GetSystemService(Android.App.Application.AccessibilityService);
if (!(manager.IsEnabled || manager.IsTouchExplorationEnabled))
{
return;
}
// Sends the accessibility event to announce.
AccessibilityEvent e = AccessibilityEvent.Obtain();
e.EventType = EventTypes.Announcement;
e.Text.Add(new Java.Lang.String(text));
manager.SendAccessibilityEvent(e);
}
static void PlatformAnnounce(string text)
{
var manager = AApplication.Context.GetSystemService(AContext.AccessibilityService) as AccessibilityManager;
var announcement = AccessibilityEvent.Obtain();
if (manager == null || announcement == null)
{
return;
}
if (!(manager.IsEnabled || manager.IsTouchExplorationEnabled))
{
return;
}
announcement.EventType = EventTypes.Announcement;
announcement.Text?.Add(new Java.Lang.String(text));
manager.SendAccessibilityEvent(announcement);
}
public static void AnnounceForAccessibilityCompat(Context context, String text)
{
if ((int)Build.VERSION.SdkInt >= 4)
{
AccessibilityManager accessibilityManager = null;
if (null != context)
{
accessibilityManager = (AccessibilityManager)context.GetSystemService(Context.AccessibilityService);
}
if (null == accessibilityManager || !accessibilityManager.IsEnabled)
{
return;
}
// Prior to SDK 16, announcements could only be made through FOCUSED
// events. Jelly Bean (SDK 16) added support for speaking text verbatim
// using the ANNOUNCEMENT event type.
EventTypes eventType;
if ((int)Build.VERSION.SdkInt < 16)
{
eventType = EventTypes.ViewFocused;
}
else
{
eventType = EventTypes.Announcement;
}
// Construct an accessibility event with the minimum recommended
// attributes. An event without a class name or package may be dropped.
AccessibilityEvent ev = AccessibilityEvent.Obtain(eventType);
var textProxy = new Java.Lang.String(text);
ev.Text.Add(textProxy);
ev.ClassName = _instance.GetType().ToString();
ev.PackageName = context.PackageName;
// Sends the event directly through the accessibility manager. If your
// application only targets SDK 14+, you should just call
// getParent().requestSendAccessibilityEvent(this, event);
accessibilityManager.SendAccessibilityEvent(ev);
}
}
public void ScreenReaderAnnouncement(string notification)
{
if ((MainActivity.accessibilityManager != null) &&
MainActivity.accessibilityManager.IsEnabled)
{
ICharSequence charSeqNotification = new Java.Lang.String(notification);
AccessibilityEvent e = AccessibilityEvent.Obtain();
e.EventType = (EventTypes)0x00004000; // This is the Android value.
e.Text.Add(charSeqNotification);
// NOTE: Announcements don't seem to interfer with other
// default announcements. Eg when game restarted, announcement on
// where focus is afterwards still gets announced. And note that
// focus remains on card being moved from a delat card pile, and
// so no announcement there gets announced by default anyway.
MainActivity.accessibilityManager.SendAccessibilityEvent(e);
}
}