Flutter: How to disable onTap for a while in gesture detector?

Create a bool flag and define a method:

bool _enabled = true; 

void _onTap () {
  // Disable GestureDetector's 'onTap' property.  
  setState(() => _enabled = false);
  
  // Enable it after 1s.
  Timer(Duration(seconds: 1), () => setState(() => _enabled = true));
  
  // Rest of your code...          
}

Usage:

GestureDetector(
  onTap: _enabled ? _onTap: null,
  child: Icon(Icons.content_copy),
)

Wrap it in an AbsorbPointer

var shouldAbsorb = true;

AbsorbPointer(
    absorbing: shouldAbsorb,
    child: GestureDetector(
      onTap: () {
        Navigator.of(context).pop();
      },
      child: Container(
        color: Colors.red,
      ),
    ),
  )

Personally I use two others methods from GestureDetector:

onTapDown: When user is pressing your widget.

onTapUp: When user leave the widget.

onTap: Is when tap down and tap up follows. If user slide his finger too much Flutter take this like a cancel tap.

onTapCancel: When user cancel.

bool pressing = false;

GestureDetector(
  // when user is pressing
  onTapDown: (details) {
    setState(() {
      pressing = true;
    });
  },
  // when user leaved
  onTapUp: (details) {
    setState(() {
      pressing = false;
    });
  },
  // when user leaved
  onTapCancel: () {
    setState(() {
      pressing = false;
    });
  }
  // the action to do when user tap
  onTap: () {
    // code...
  }
);

Here is the documentation: Flutter GestureDetector Documentation