如果要在 / storage / emulated / 0 中创建目录，请尝试此操作。

if you want to create dir in /storage/emulated/0 try this.

import 'dart:io';
 _createFolder()async{
final folderName="some_name";
final path= Directory("storage/emulated/0/$folderName");
if ((await path.exists())){
  // TODO:
  print("exist");
}else{
  // TODO:
  print("not exist");
  path.create();
}

}