How To Capture Someone’s Picture Who Tries To Unlock Your Phone

You can use Hidden Eye...

How Hidden Eye Works?

It’s very simple to use the Hidden Eye app: just open it and tap on the OFF button which is located at middle and then tap to ACTIVATE it. Now tick the options on which you want to get alerted, and this is it.
Hidden Eye app work on a very simple idea- each time intruder tries to unlock your device, it will capture an image of him/her which you can see by tapping on View Intrusions. You can also see the date and the timing below the image captured by app. 
If you have turned on the first option, your phone will ring after 3 attempts with the default ringtone. With enabling the second option, you will get to see the intrusion in notification bar. And if you enabled the third option, you will get to see the intruder’s image at the time of unlocking your phone.
Note:
You can find other free software for the same use, for e.g. Lockwatch. If you want to enjoy some more features, you can buy the plus version of Hidden Eye app. There will an ad-free user interface with plus version. Also, if your Android phone is being stolen, it can track the location on the map and you can send photographic evidence of thief.
Download this Hidden Eye app from Google Play Store.