我不相信你将能够直接与 RemoteViews 使用自定义类即使它从支持类之一派生（注解是的不的继承）。你可以尝试使用的TextView ，使用对 RemoteViews参考倒计时在服务 对象和更新来自那里。

I don't believe you're going to be able to use a custom class directly with RemoteViews even if it's derived from one of the supported classes (annotations are not inherited). You could try using a TextView, counting down in a Service with a reference to the RemoteViews object and updating from there.