How to use the Simple Dialog widget - flutter

Question

I'm trying to use a SimpleDialog to select an image from Gallery or Camera but I'm getting the run error type 'SimpleDialog' is not a subtype of type '(() => void)?'
This is my function to call the dialog box
selectImage(context) {
{
return SimpleDialog(
title: Text("Upload Image"),
children: [
SimpleDialogOption(
child: Text("Take Photo"),
onPressed: handleTakePhoto,
),
SimpleDialogOption(
child: Text("Upload From Gallery"),
onPressed: handleChooseFromGallery,
),
SimpleDialogOption(
onPressed: () => Navigator.pop(context),
child: Center(
child: Text("Cancel"),
),
),
],
);
}
}
My handleTakePhoto and handleChooseFromGallery functions are as
handleTakePhoto() async {
Navigator.pop(context);
File file = (await ImagePicker().getImage(
source: ImageSource.camera,
maxHeight: 675.0,
maxWidth: 960,
// imageQuality: 50, //TODO: Look into this
)) as File;
setState(() {
this.file = file;
});
}
handleChooseFromGallery() async {
Navigator.pop(context);
File file = (await ImagePicker().getImage(
source: ImageSource.gallery,
maxWidth: 960,
maxHeight: 675,
preferredCameraDevice: CameraDevice.rear)) as File;
setState(() {
this.file = file;
});
}
Where have I gone wrong?

Answer 1

try to this way implement third dialog
SimpleDialogOption(
onPressed: () { Navigator.pop(context) },
child: Center(
child: Text("Cancel"),
),
),

Answer 2

SimpleDialog needs to be wrap inside showDialog, to get it displayed
Future<void> selectImage() async {
await showDialog(
context: context,
builder: (BuildContext context) {
return SimpleDialog(
title: Text("Upload Image"),
children: [
SimpleDialogOption(
child: Text("Take Photo"),
onPressed: handleTakePhoto,
),
SimpleDialogOption(
child: Text("Upload From Gallery"),
onPressed: handleChooseFromGallery,
),
SimpleDialogOption(
onPressed: () => Navigator.pop(context),
child: Center(
child: Text("Cancel"),
),
),
],
);
});
}
Output: