CallStyle

Helper class for generating large-format notifications that include a caller and required actions, and indicate an incoming call. If the platform does not provide large-format notifications, this method has no effect. The user will always see the normal notification view. This class is a "rebuilder": It attaches to a Builder object and modifies its behavior, like so:

Notification notification = new NotificationCompat.Builder(mContext)
    .setSmallIcon(R.drawable.new_post)
    .setStyle(
            new Notification.CallStyle.forIncomingCall(caller, declineIntent, answerIntent))
    .build();