Does he have the camera lock screen widget on? This is the only thing I can think of.
My phone does not do this, although I'm not using the stock camera either.

 

Holding + volume button while phone is locked does indeed open camera using stock app. Never realized it did that. Don't have any widgets on lock screen so has to be feature of stock camera app. Couldn't find any obvious settings anywhere to disable.

 

Maybe try setting a pin on the lock screen.

 

Still nothing here... Must be because I uninstalled the stock camera?
I hold vol+ and get a little vibrate after a few seconds, but nothing actually happens. Same with vol-.

I also have pattern lock on.

 

Probably is due to you not having stock app. On mine the camera app opens right after the little vibrate.

 

Actually no, it was due to the pattern lock. Switched it to swipe and it launched the camera. So there's the fix, use a lock, unless your camera still opens, then it's a matter of not having a system level camera.

 

I have a pattern lock an my camera still opens using the volume buttons when locked. I love this feature of the phone!

 

Are you using the stock camera, or is your camera a system app? It could be because my camera is not a system app and therefore doesn't have permission to override the lock.

 

I'm using the stock camera.

 

IGNORE, THIS WAS A DUPLICATE POST.

 

Your husband and I were in the same boat, before I found Noyze Volume Panel, I ended up with no storage and was puzzled to find 1,364 black photos. This is an odd solution but it is the only one that I know of.

If you haven't already, enable unknown sources in settings under security and install the apk linked to above.

Open noyze volume panel and enable it and its accessibility feature, then customize it as you wish.

You should no longer have the camera launch on the lock screen, but if you have any issues, let me know so I can try to troubleshoot why it's not working for you.

Hope it works!

 

His case must be also pressing the virtual shutter button. On mine, the volume down will cause the camera app to open on top of the lock screen (after a vibrate), but it does not take a picture. It just sets there until the on screen shutter button is pressed.

 

Yes that was my issue too, but now that I have Noyze Volume Panel enabled, pressing and holding the volume buttons when the phone is locked does nothing except make the phone vibrate once and then nothing else happens. I am EXTREMELY baffled as to why this prevents the camera app from launching, it must have something to do with the fact that noyze replaces the volume panel without root. I discovered it by accident long after I gave up on finding a solution to the issue, but now that I have a solution, Noyze is an essential app for me on this phone.

 

Not sure if you still have this problem or not, But I have a solution for you. I had the same trouble and I downloaded the google camera and was hoping to uninstall the stock camera. Well it is either impossible to uninstall or is too much trouble so its still on my phone. However, now when my phone is in my pocket and I accidentally hold the volume button long enough to activate the camera, rather than the camera taking 160 pics of the inside of my pocket, I get the screen asking which camera to use. Kinda sucks to have 2 cameras installed on the phone but it's worth it not to have to delete all those pics every few days.

 

That would be cool if it did take a pic, Ive tried and tried, I can feel the cam vib for a sec, and once you unlock the camera pops up but mine is all stock and does not take any pics. Would be nice to take quick though without have to unlock the phone, are times when that would be useful.

 

This is such a simple fix. thank you.

 

To every one that like this function, you must be completely ********.

 

Necropost, but this is a top match when searching issue using google, so replying for others who reach this page the same way.

Same issue occurs with my V20. I think it's ridiculous that touching down vol bypasses lock screen to turn on camera and developers gave NO option to change / disable!

Anyway, got google camera and set vol keys to be vol keys. (Side benefit: no rapid fire photos just cuz I touch them when turning phone sideways.)

Then, turned OFF Camera permission for native camera app! So now if I accidentally touch vol down grabbing my phone or taking out of pocket, the f***ing camera CAN'T start! Just get a warning message instead.