how to disable button after first click?

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Mar 21, 2019, 2:53:36 AM3/21/19

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how to disable the button after the first click?

But in the login page, users type username incorrectly in the first time and second time user cant click second time also, how to fix this?

 onPressed: () async {
 if (_firstClick) {
_firstClick = false;
(isOffline)
? _showSnackBar()
: checking2(usernameController, context, _url);
}

full question and full code,

EIFhm.gif

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