Flutter gesturedetector not working in stack widget - flutter

Question

I am using the stack widget to show the back arrow button on an image. And its showing but the problem is it's not tappable mean Gesturededector is not working on Stack.
My code
Stack(
children: <Widget>[
Container(
height: height * 0.4,
decoration: BoxDecoration(
image: DecorationImage(
image: AssetImage(
'assets/images/place2.jpg',
),
fit: BoxFit.fill,
),
),
),
GestureDetector(
behavior: HitTestBehavior.translucent,
onTap: () => print("first container"),
child: Align(
alignment: Alignment.topLeft,
child: Container(
margin: EdgeInsets.only(left: width * 0.03),
padding: EdgeInsets.only(top: statusBarHeight * 2),
child: Icon(
Icons.arrow_back_ios,
size: 25,
color: Colors.white,
),
),
),
),
SingleChildScrollView(
child: Padding(
padding: EdgeInsets.only(top: height * 0.3),
child: SingleChildScrollView(
child: ClipRRect(
borderRadius: BorderRadius.only(
topRight: Radius.circular(30),
topLeft: Radius.circular(30)),
child: Container(
decoration: BoxDecoration(
color: Colors.white,
),
child: Column(
mainAxisSize: MainAxisSize.min,
children: <Widget>[
SizedBox(
height: height * 0.05,
),
Container(
width: width,
margin: EdgeInsets.only(left: width * 0.03),
child: Text(
'NYC Food Festival',
textAlign: TextAlign.left,
style: TextStyle(fontSize: 30),
),
),
SizedBox(
height: height * 0.02,
),
Container(
margin: EdgeInsets.only(left: width * 0.03),
child: Row(
children: <Widget>[
Icon(
Icons.calendar_today,
size: 20,
color: Color(0xff808080),
),
SizedBox(width: width * 0.02), // give it width
Column(
children: <Widget>[
Text(
'Sat, May 25, 2020',
style: TextStyle(
color: Color(0xff000000),
fontWeight: FontWeight.bold,
fontSize: 15),
),
],
)
],
),
),
SizedBox(
height: height * 0.02,
),
Container(
margin: EdgeInsets.only(left: width * 0.03),
child: Row(
children: <Widget>[
Icon(
Icons.attach_money,
size: 20,
color: Color(0xff808080),
),
SizedBox(width: width * 0.02), // give it width
Column(
children: <Widget>[
Text(
'25,000 PKR',
style: TextStyle(
color: Color(0xff000000),
fontWeight: FontWeight.bold,
fontSize: 15),
),
],
)
],
),
),
SizedBox(
height: height * 0.02,
),
SizedBox(
height: height * 0.02,
),
Container(
width: width,
margin: EdgeInsets.only(left: width * 0.03),
child: Text(
'Snaps',
textAlign: TextAlign.left,
style: TextStyle(fontSize: 25),
),
),
SizedBox(
height: height * 0.02,
),
Container(
child: Column(
children: <Widget>[
CarouselSlider(
options: CarouselOptions(
autoPlay: true,
aspectRatio: 2.0,
enlargeCenterPage: true,
),
items: imageSliders,
),
],
)),
SizedBox(
height: height * 0.02,
),
Container(
width: width,
margin: EdgeInsets.only(left: width * 0.03),
child: Text(
'About',
textAlign: TextAlign.left,
style: TextStyle(fontSize: 25),
),
),
SizedBox(
height: height * 0.02,
),
Container(
padding: EdgeInsets.only(
right: width * 0.03, left: width * 0.03),
child: DescriptionTextWidget(
text:
"Flutter is Google’s mobile UI framework for crafting high-quality native interfaces on iOS and Android in record time. Flutter works with existing code, is used by developers and organizations around the world, and is free and open source.")
),
SizedBox(
height: height * 0.02,
),
Container(
width: width,
margin: EdgeInsets.only(left: width * 0.03),
child: Text(
'Included',
textAlign: TextAlign.left,
style: TextStyle(fontSize: 25),
),
),
SizedBox(
height: height * 0.02,
),
Included(),
SizedBox(
height: height * 0.01,
),
Included(),
SizedBox(
height: height * 0.01,
),
Included(),
SizedBox(
height: height * 0.01,
),
],
),
),
),
),
),
),
Positioned(
bottom: 0,
left: 0,
right: 0,
child: Container(
height: 100,
decoration: BoxDecoration(
// color: Color.fromARGB(110, 255, 255, 255),
borderRadius: BorderRadius.only(
topLeft: Radius.circular(20),
topRight: Radius.circular(20),
),
gradient: LinearGradient(
colors: [
Color.fromARGB(30, 255, 255, 255),
Color.fromARGB(255, 255, 255, 255),
],
begin: Alignment.topCenter,
end: Alignment.bottomCenter,
),
),
child: Center(
child: InkWell(
child: Container(
padding: EdgeInsets.symmetric(
horizontal: 80,
vertical: 20,
),
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(30),
color: Colors.blueAccent,
),
child: Text(
"BOOK NOW",
style: TextStyle(
fontWeight: FontWeight.bold,
fontSize: 20,
color: Colors.white),
),
),
onTap: () {
return print("Tap");
},
),
),
),
),
],
)
I need to use it as a back button when I navigate but it's not working then for testing I just print a value onTap but its also not working I try to add behaviour also.

Answer 1

Can you try putting GestureDectector after SingleChildScrollView in a stack.
I guess SingleChildScrollView is lying above GestureDetector since it is a stack.
SingleChildScrollView(),
GestureDetector(),