It seems that your device does not support camera
I have come across an error which I guess is very common in OpenCV apps. When I try to run the app, it says "it seems that your device does not support camera(or it is locked)". I have seen this and this and I have already done whatever they have said, like granting camera permission and rebooting the device etc. But still problem persists. I know this problem means that any other app must be using camera and hence it is locked. When I clear the cache of all the apps using camera which might me using camera, then it works but just once. After that same issue. Any solution to this problem?
Thank you.
Answer
I have just run into the same problem with OpenCV for Android, and found that going to the phone's Settings -> Apps (or similar) -> Your app -> Permissions and enabling the Camera permission seems to solve the problem.
Hope this helps.
Update
As noted by @F43nd1r in the comments below, asking the user to update their permissions in the app settings menu should not be done for your own apps. What should be done is to ask the user for permission to access the camera/whatever, as per https://developer.android.com/training/permissions/requesting.html.