How to implement authorization in the application?

Question

Android

How to implement authorization in the application through any web service?
Let's say the application has a login activity, where you need to enter a username and password, for example, from Instagram, after which the login will be performed under this profile.

Answer 1

How to execute approval in the application through any web administration?
Suppose the application has a login movement where you want to enter a username and secret phrase, for instance, from Instagram, after which the login will be performed under this profile
Thanks.
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Answer 2

Obviously use oauth2 .
I don’t know about Instagram, but in general, there are a lot of sites that support this feature.

Answer 3

Very simple:
like this: https://firebase.google.com/docs/auth
or like this: https://developers.google.com/identity/sign-in/and...
or like this: https://developers .facebook.com/docs/facebook-logi...
In general, have you been banned in Google?