flutter checkbox

bool isChecked = false;
Checkbox(
              value: isChecked,
              onChanged: (value) {
                setState(() {
                  isChecked = value!;
                });
              },
            ),

CheckboxListTile(
    title: Text("title text"),
    value: checkedValue,
    onChanged: (newValue) { 
                 setState(() {
                   checkedValue = newValue; 
                 }); 
               },
    controlAffinity: ListTileControlAffinity.leading,  //  <-- leading Checkbox
  )

bool _value = true;

Checkbox(
  value: _value,
  onChanged: (bool newValue) {
    setState(() {
      _value = newValue;
    });
  },
)

// Please format your code

  CheckboxListTile _ = CheckboxListTile(
    title: const Text("title text"),
    value: checkedValue,
    onChanged: (newValue) {
      setState(() {
        checkedValue = newValue;
      });
    },
    controlAffinity: ListTileControlAffinity.leading, //  <-- leading Checkbox
  );