Can someone recommend an app protect app. Something that locks your apps (after the phone is locked)
For example, your email. You could have another lock on.
I sometimes have to give me phone to the masters of the universe (the kids). A swipe here and a swipe there and they could do a lot of damage that I maybe unaware of!
I had an app that I paid for. But even though I paid, it still gave annoying ads. So looking for another.
This kind of functionality is built into many security and antivirus applications. I use the AVG app, which has a function called App Lock, which has a PIN for apps you select. May be able to link your fingerprint to them, too, if your phone has a compatible reader.
The Android® version is here:
There's probably standalone apps too, but check their provenance before installing.
Most decent apps come with their own locking facility built in, for instance Aquamail and MailDroid can both be locked with a pin, pattern, password and/or fingerprint, (I mention them because they're mail clients and you mentioned email).
I find that the best way of ensuring access is prevented.
For those apps which don't prevent access I'd recommend uninstalling them, or disabling them if you can't uninstall them and using alternatives which do have such security, (where security is needed to prevent accidental or miscreant usage), because apps with that kind of security tend to be much better built and a lot more secure than their alternatives.
Can get quite costly though if you've a lot of apps to replace, so the security software option might be more appropriate for you.
If you have an Android phone @ytokyo there are plenty of stand alone app locks in the Play Store. I used to use one simply called App Lock which worked fine and could be switched on or off any app you like, including G Mail. Some work either with a code or fingerprint. Best to look at reviews etc. before choosing though. The app itself should have a lock on it.
I don't need a separate one now, because my inexpensive Huawei phone came with a very good one built in. It also came with built in Avast security. Not bad for the money !