There’s Private Space, but that’s not ideal for a general-purpose messaging app because notifications are suspended when the space is locked. Signal also has the option to require the same authentication method as your screen lock in order to access the app.

All of this is great, but there’s literally nothing stopping the next article from saying “user who left their phone unlocked with signal also unlocked ‘got hacked’”

User who installed App in Phone found to have App data in Phone! More at eleven.

It s litteraly on the signal option “Require acces code to open signal”

Yes, but that’s a signal option, not an android option. The original commenters said ios had a feature to require additional credentials and was wondering about android, not a specific app that happens to be on android

Some Android devices has app lock build in.

I have App Locker in settings iy let’s me use a fingerprint unlock on any apps I want, I assume it’s a stock Android feature.

fingerprint

guess what.