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https://sourcey.com/articles/beautiful-android-login-and-signup-screens-with-material-design
https://code.tutsplus.com/tutorials/designing-wireframing-prototyping-an-android-app-part-2--cms-27060
https://www.mockplus.com/blog/post/sign-up-login-design-practices
https://www.mockplus.com/blog/post/andriod-app-ui-design
https://medium.com/@temidjoy/a-simple-local-unit-test-for-a-login-system-on-android-studio-560ff5fd4e39
https://www.justinmind.com/blog/7-stupidly-simple-login-forms-and-how-to-prototype-them-with-justinmind/
https://developer.android.com/studio/write/layout-editor
https://stackoverflow.com/questions/22209046/example-and-explanation-android-studio-login-activity-template-generated-acti
https://developer.android.com/training/design-navigation/wireframing
https://www.invisionapp.com/tour/android-prototyping
https://dribbble.com/tags/login_screen
https://framer.com/
https://www.fluidui.com/