Create an app template which handles basic signup and login activities #1
Description
Create an app template of your choice with good UI which handles basic signup and login activities.
You can use arrays/shared preference/database or anything you know to store username and password.
Be careful of NPEs(Null Pointer Exceptions)!
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Once logged in/registered, the user must remain logged in thereafter, until and unless he/she log out/uninstall the app.
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There should not be any Null Pointer Exceptions, which may crash the app.
Be as creative as possible!