通常来说，你做不到.在DND模式下，即使具有 MAX 优先级的通知也不会显示.

Generally speaking you can't. Even notification with MAX priority wont be shown in DND mode.

我可以想象的可能的解决方法是使用android.permission.SYSTEM_ALERT_WINDOW在系统窗口上绘制自定义通知(FB Messanger的工作方式与此类似):

The possible workaround that I can imagine is to use android.permission.SYSTEM_ALERT_WINDOW to draw custom notification over system window (FB Messanger works in similar way) : Creating a system overlay window (always on top) . But this method is suitable only in rare cases and most of the time it's a violation of Android UI/UX best practices.