how to call a method from another dart file? - flutter

Question

in my programme i want to call the same path inside a methode called getPhoto()=>upload(statefulwidget) to other file or statefulwidget
Future getPhoto() async{
FirebaseFirestore fearbase = FirebaseFirestore.instance;
Reference ref=FirebaseStorage.instance
.ref()
.child("${widget.user}/ProfileData")
.child("Url_$postId");
await ref.putFile(file!);
downloadUrl=await ref.getDownloadURL();
// upload image to firestore
var list=[];
await fearbase.collection("users").doc(widget.user)
.collection("PostData").doc(ido)
.set({"PostUrl":downloadUrl,"ownerName":loggedInUser.username,"userId":loggedInUser.uid,"timestemp":postId,"PostId":ido,"like":FieldValue
.arrayUnion(list)})
.whenComplete(() => Fluttertoast.showToast(msg: "Image Uploaded successfully .i."));
// .then((DocumentReference ido) => ido.update({"PostId":ido.id}))
}
more specifically i want to get like field path from the other file

Answer 1

There are multiple ways to do this.
But the simple one is you should create a class and define this method within the class.
class Demo {
static void getPhoto() {
print("photo");
}
}
Then your can access it like
Demo.getPhoto()

Answer 2

You can use callback function to solve this.
Future<String> getPhoto() async {
Reference ref = FirebaseStorage.instance
.ref()
.child("${widget.user}/ProfileData")
.child("Url_$postId");
await ref.putFile(file!);
return await ref.getDownloadURL();
// upload image to firestore
// .then((DocumentReference ido) => ido.update({"PostId":ido.id}))
}
Future upload(String downloadUrl) async {
FirebaseFirestore firebase = FirebaseFirestore.instance;
var list = [];
await firebase.collection("users").doc(widget.user)
.collection("PostData").doc(ido)
.set({
"PostUrl": downloadUrl,
"ownerName": loggedInUser.username,
"userId": loggedInUser.uid,
"timestemp": postId,
"PostId": ido,
"like": FieldValue
.arrayUnion(list)
})
.whenComplete(() => Fluttertoast.showToast(msg: "Image Uploaded successfully .i."));
}
In usage, you can pass the function as follows
getPhoto().then(upload);
Or
final downloadUrl = await getPhoto();
await upload(downloadUrl);