[Android Central Question]

I have an application that requires a username and password. I don't want to have to enter this every time. I"m looking for a SIMPLE way on an Android 6 phone to have this EASILY get logged in... I found something online about being able to use an abbreviation like "qq" to replace a username and password but I can't find it again, and I"m not sure it would work for logging in to an app...

And yeah, I know, security and whatever. So please don't waste everyone's time with a bunch of "you shouldn't do that"... If the app is going to be useful, and GET USED, it's going to have to take zero time logging in.

So, how DO I absolutely minimize or, even better, have the login get done automatically any time I open an app?