Use the calculator photo vault to 
.
This is a disguised lite version of the Sgallery (https://play.google.com/store/apps/details?id=com.hld.anzenbokusu) that was designed and developed specifically for users who have higher demand for privacy security. 
- Enter the Sgallery method: Long press the title of the "Calculator" .
- Quickly enter the Sgallery method: After entering the PIN, press “=” (this method requires you to set the PIN or the unlock mode to the Time PIN), and at the same time, support the access through the fingerprint already recorded on the device.
Sgallery is a fantastic privacy protection app to easily hide and encrypt your photos, videos and any other files that you do not want others to see.
Sgallery can hide its app icon and keep you privacy absolutely safe. You can import your private images and videos in this secure space, and nobody knows the existence of it.
What's more, Sgallery has the beautiful design, it provides you the smooth and amazing media browse experience.
[Vault] Through the AES encryption algorithm, encrypt the content that you do not want to share with others, and the file format, size without any restrictions, but also support taking pictures and recording videos.
[Browser] Photo and video traceless download.
[Hide Icon] In addition to your own, others will not find the existence of the app.
[Shake Close] Shake the phone can quickly close the app, so that everything in your control.
[Intruder Selfie] Do not worry about someone trying to break into.
[Fake Password] Even by others found that in an awkward position, you will be very calm.
[Fingerprint Unlock] To provide you with a faster, more secure way to unlock.
[Colorful Theme] A variety of fashionable colors, any match, to create your exclusive theme.
[Calculator] Offers all the regular and scientific calculator functions in a simple, stylish and easy to use. 
------------------------------ FAQ ------------------------------
If you have set security question, you can retrieve the password through it,
or if you have already registered an account, you can retrieve it by verifying your account email. 
Long press on the encrypted file will enter the edit mode, you can restore it by using the restore button in the action bar.
Long press the title of the "Calculator" to open.
Tips: There is a case that cannot be unlocked by long press title. This means that you have turned on the switch that Prohibit Unlocking by Long Press Title. At this case, you can use a system browser to access the website: http://htmlpreview.github.io/?https://github.com/kaku2015/PrivacySafeDocs/blob/master/privacy_safe.html or dial the number by phone , After dialing "*#*#1397#*#*" (Galaxy is invalid) to start the Sgallery, check the relevant settings or disable the Prohibit Unlocking by Long Press Title.
More FAQ: https://github.com/kaku2015/PrivacySafeDocs/blob/master/FAQ.md

Bug Fixes