Flutter- GestureDetector not working with containers in stack

Question

I have two containers in a stack and both containers have GestureDetector.The OnTap for the first container is working fine but it\'s not working with another container. The

Answer 1

GestureDetector is not working when write code inside its block It will be doesn't work

GestureDetector(
                  onTap: () {
                    setState(() {
                      _color = Colors.red;
                    });
                  },),

You will write like that it will work

GestureDetector(
                  onTap: () {
                    changed();
                  },),

method

void changed() {
setState(() {
  _color = Colors.red;
});}