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https://www.smashingmagazine.com/2016/09/how-to-design-error-states-for-mobile-apps/
https://ux.stackexchange.com/questions/108995/material-design-how-to-display-a-log-in-error
https://sourcey.com/articles/beautiful-android-login-and-signup-screens-with-material-design
https://stackoverflow.com/questions/30953449/design-android-edittext-to-show-error-message-as-described-by-google
https://code.tutsplus.com/tutorials/how-to-solve-androids-most-common-error-messages--cms-28706
https://javapapers.com/android/beautiful-android-login-screen-design-tutorial/
https://medium.com/@elye.project/material-login-with-helper-text-232472400c15
http://www.androhub.com/login-signup-and-forgot-password-screen-design-android/
https://think360studio.com/how-to-design-an-error-message-for-a-mobile-app/
https://material.io/design/
https://www.toptal.com/android/top-10-most-common-android-development-mistakes
https://www.quora.com/How-do-I-fix-rendering-problem-in-Android-Studio-See-error-screenshot
https://android.jlelse.eu/android-form-validation-using-custom-statelistdrawables-46a82a34f7cc