Now I use Applock by DoMobile. It is Most downloaded app lock in Play Store, Now it has over 300 Million Users.https: //play.google.com/store/apps/details? id= com.domobile.applock& referrer= utm_ source% 3DapplockI am using it from couple of month on my Xperia Z phone. Battery consumption is quite ok not so heavy. Other features are good like locking files, videos, photos, or harassment intercept etc. No one can view my phone. Smart! I like all features! 1.Intruder selfie and Incognito browser. You will find who is trying to get into your phone and see your secrets. No browser history to keep safe.2.Fake Cover: Put a cover like fake fingerprint scanner or force closed message on locked apps to confuse the intruder.3. AppLock can lock apps so that they can’t be opened without the password.4.AppLock can hide pictures and videos.5.Hide itself from the home screen and put a cover on locked apps.6.Lock/unlock apps automatically according the time or location.7.You can set different profiles to lock different apps.8.Random keyboard: prevent other people peeping the password.