Validation in Login and Registration Form using SetError,

I am developing an android app: here is the link for my app which I am making (ignore the question asked in the below given link, just look at the code which I have posted in the link below) :

I want to make Validation in Login and Registration Form using SetError. Could someone guide me in full format using my code given in the above link?

This app is a GPS tracking app, just like LIFE360 app.

I will appreciate any help.


Refer These links..SetError Method Examples

SetError Method Examples2

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