flutter - 无法调用另一个文件中的方法

Question

I have create a dart file with the method below. As you can see its job is to delete a file in Firestore. What I do not understand is why I can't call it from an other dart file. In the view where I want to use that I have imported 'import 'package:xxxxx/Services/Firestore/api_delete_file_in_firestore.dart';'

I am getting this error message: The method '_deleteFileInFireStore' isn't defined for the type '_Reference_Detail_Edit_SaveState'.

Thank you for your help.

import 'package:firebase_storage/firebase_storage.dart';

class FireStore_Api{

  static void _deleteFileInFireStore(String fileToDelete) async {
    try {
      Reference firebaseStorageRef =
      FirebaseStorage.instance.ref().child(fileToDelete);
      await firebaseStorageRef.delete();
      print('Successfully deleted $fileToDelete storage item' );
    } catch (e) {
      return null;
    }
  }
}

now, this is where I am calling this function. I do not understand what is the problem.

 Padding(

                    padding: const EdgeInsets.only(right:25.0),
                    child: IconButton(onPressed: (){
                      //delete a record and the card displaying this record
                      // Delete the selected file

                      setState(() {
                        if (task_Attachments.length !=0) {
                          print ('delete' + result);

                          _deleteFileInFireStore(result); //delete the file selected in firestore
                          
                          task_Attachments.removeAt(j);
                          _delete(context);
                          
                        };
                      });
                    },
                      icon:Icon (Icons.delete, color: Colors.red,),),
                  ):

Answer 1

What was wrong with your function, the function you created is private , and private functions can only be accessed within the file in which it was created .

Remove the _ underscore from the function: _deleteFileInFireStore(String fileToDelete)

Final result

deleteFileInFireStore(String fileToDelete)

Answer 2

In the file you want to access, you can first create an object for this class and try to access it through that object. (I know you define static but I don't understand what's the problem and this will help for solution)