Looking for logging into the Android App To Server User site and are not getting the correct working link for it? In such a case, you can use the links given here by searching your desired login page in the search box. If the page is present on our website then you will get all the links related to the Android App To Server User site. After that you can login as usual with your login credentials.
https://www.back4app.com/docs/android/login-android-tutorial
https://www.quora.com/How-do-I-create-secure-user-Login-to-server-on-Android-app
https://developers.google.com/identity/sign-in/android/backend-auth
https://stackoverflow.com/questions/19799416/how-do-popular-apps-authenticate-user-requests-from-their-mobile-app-to-their-se
https://stormpath.com/blog/build-user-authentication-for-android-app
https://developer-blog.net/android-client-php-server-kommunikation/
https://www.journaldev.com/12607/android-login-registration-php-mysql
https://www.androidhive.info/2012/01/android-login-and-registration-with-php-mysql-and-sqlite/
https://docs.microsoft.com/en-us/azure/app-service-mobile/app-service-mobile-android-get-started-users
https://firebase.google.com/docs/auth/android/google-signin
https://cloud.google.com/solutions/mobile/mobile-firebase-app-engine-flexible
https://www.siteground.com/kb/connect-cpanel-mobile-device-cpanel-app/
https://support.plex.tv/articles/200878643-sign-in-to-your-plex-account/