Should Always Select Account : If enabled it will show all google accounts registered on the device.
Step by Step :
Error login with google : It is executed when a connection is not achieved.
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In progress : It is executed when the login attempt is in process.
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Play services not available : It is executed when logging in is not achieved since it is trying to log in with the same account on another platform.
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Sign in cancelled : It is executed when the user cancels the login attempt.
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Successful login with google : It is executed when the user achieves a successful login.
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Null