Dialog disappearance error

[Chou95]

Hi, dear developers!
I am using your app DNS66! I like the app but I find that a dialog may disappear when I rotate the phone.

However, I think it is easy to save the UI state of these dialogs by saving the return value of dialog.isShowing(). In this way, you can decide whether to re-open these dialogs when the phone rotation and UI recreation occur. This may improve the user experience, do you think so?

Here are the snapshots to illustrate the error:
before rotation:

after rotation: