which app is most popular for lock my images and videos?

hello there i lost my iPhone and now have to sift to android mobile i'm looking for image and video privacy app for my new HTC One. i was using LEO Privacy Guard in iPhone but confused as there are somany option available in android should i use the same or should i go with any other app ? i found couple of option in android like.


RedPhone: Private Calls
AppLock (Free Application Lock Utility)
LEO Privacy Guard
AppLock
CM Security Antivirus AppLock
Smart AppLock






any other app idea is also welcome thanks

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