How to use image_picker in flutter - flutter

Question

I am confused about how to use image_picker, this is how I use it in my application (like in many tutorials):
class AddDialogState extends State<AddDialog> {
File galleryFile;
Widget _onlyStatus() {
getLocalImage() async {
var _galleryFile = await ImagePicker.pickImage(
source: ImageSource.gallery
};
setState(() {
galleryFile = _galleryFile;
});
print(_galleryFile.path);
}
return Column(
........
FlatButton.icon(
onPressed: () {
getLocalImage();
}
)
)
}
#override
Widget build(BuildContext context) {
// fullscreen dialog
.........
body: _onlyStatus()
}
}
The problem was, the above code doesn't start ImagePicker, when i click the FlatButton, the above code just produce an error the getter 'path' was called on null, it doesn't start any new activity related to gallery, so what's wrong with my code?

Answer 1

Actually pickImage() is deprecated now. So you have to use ImagePicker.getImage(source: ImageSource.gallery)
Click here for more
void getImage(ImageSource imageSource) async {
PickedFile imageFile = await picker.getImage(source: imageSource);
if (imageFile == null) return;
File tmpFile = File(imageFile.path);
final appDir = await getApplicationDocumentsDirectory();
final fileName = basename(imageFile.path);
tmpFile = await tmpFile.copy('${appDir.path}/$fileName');
setState(() {
_image = tmpFile;
});
}
The code also store image file in device directory. Path pacakage is also used.

Answer 2

Here is my example you only need to call the SelectionItem and pass the required parameters and it's done, also it includes support for Android and iOS.
class SelectionItem {
String text;
GestureTapCallback action;
SelectionItem({
this.text,
this.action,
});
}
Widget _getOptionWidget(SelectionItem item) {
return SimpleDialogOption(
onPressed: item.action,
child: Text(item.text),
);
}
Widget _getCupertinoOptionWidget(SelectionItem item) {
return CupertinoActionSheetAction(
onPressed: item.action,
child: Text(item.text),
);
}
showSelector(
BuildContext context, {
String title,
List<SelectionItem> actions,
}) {
bool isAndroid = Injector.instance.platform == Platform.ANDROID;
if (isAndroid) {
final items = actions.map((action) => _getOptionWidget(action)).toList();
return SimpleDialog(
title: Text(title),
children: items,
);
} else {
final items =
actions.map((action) => _getCupertinoOptionWidget(action)).toList();
return Column(
mainAxisAlignment: MainAxisAlignment.end,
children: <Widget>[
CupertinoActionSheet(
title: Text(title),
actions: items,
cancelButton: CupertinoActionSheetAction(
onPressed: () {
NavigationUtils.pop(context);
},
child: Text("Cancel"),
),
),
],
);
}
}

Answer 3

your showDialog should be something like this:
Container(
width: 300,
height: 300,
child: GestureDetector(
onTap: () {
showDialog(
context: context,
builder: (BuildContext context) => showSelector(
context,
"Select",
actions: [
SelectionItem(
"Camera",
action: () {
getImage(ImageSource.camera);
Navigator.of(context).pop();
},
),
SelectionItem(
"Gallery",
action: () {
getImage(ImageSource.gallery);
Navigator.of(context).pop();
},
)
],
),
);
},
),
)

Answer 4

Here is my code for image_picker: ^0.8.4+4 (flutter 2.8.1)
bool hasImage = false;
File? image;
Future getImage(ImageSource source) async {
try {
final image = await ImagePicker().pickImage(source: source);
if (image == null) return;
final imageTemporary = File(image.path);
setState(() {
this.image = imageTemporary;
hasImage = true;
});
} on PlatformException catch (e) {
debugPrint('Failed to pick image: $e');
}
}