How do I keep my camera active on Android even when the phone is locked and screen sleeps?
Well it depends on your android version however supposing you are using lollipop you can lock up an application to only make that one work. And you can download an app called caffeine from play store that avoids your phone to go stand by. If you don't want to be notice by any means, you can download an app called spy camera HD pro by MVM studio.