Android Question .

Can you upload your complete project (File - Export as zip)?

The error you get is in the native camera driver. Add a one second delay until you reenable the camera. It seems to fix this issue.

You can create these subs:

I think the CamerEx.TakePicture calls code runs on a different thread and so returns immediately so your button is never actually disabled.

You need to enable the button again in the PictureTaken event or if there is an error thrown.