Spy Camera Pro

Before buying, please, try if this free version works ok on your phone - https://play.google.com/store/apps/details?id=com.triladroid.spycamera

This Pro version of Spy Camera is without ads and also it has burst photo option. It is possible to take burst photos with different time intervals - 1 sec, 3 sec, 10 sec, 30 sec and 1 minute.

To start burst mode press any volume button, to stop burst mode just exit the app. If you want to start burst mode again, just enter the app again and click volume button to start taking photos in burst mode. If you want to turn off burst mode - go to Settings --> Burst mode and select No burst. After it your camera will switch to the normal mode where you will be able to take photos with volume buttons.

Use hardware volume buttons to take hidden photo! There will be no preview, no sound and no flash during taking photo.

After installation Spy Camera will appear among your applications named as SC Pro (meaning Spy Camera).
Launch Spy Camera. After it your screen will become black. To take photo press Volume Up or Volume Down buttons on your phone. To exit Spy Camera press Back button or Home button on your phone.

The application can work in two modes. First mode is when the screen is black so it looks like your phune is off and second mode is when phone screen is on and shows wallpaper. To switch between these two modes go to the settings by pressing Menu button. Also in Settings it is possible to read Help with brief instructions of how to use Spy Camera and an option to show Help message after first launch of Spy Camera.

All pictures taken with Spy Camera will appear on your SD card in folder named SpyCamera.

Please, don't downvote if something doesn't work. Just write me an e-mail at triladroid@gmail.com and I'll try to help with all your problems!