Flutter Desktop Apps: Getting Started

Mar 28 2023 · Dart 2.19, Flutter 3.7, Android Studio 2021.3.1 or higher, Visual Studo Code 1.7.4 or higher

Part 1: Flutter Desktop Apps

11. Importing Data

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Android Studio

Let’s test this out by deleting our todos and writing the import code.

final result = await FilePicker.platform.pickFiles(
  dialogTitle: 'Open file',
  allowedExtensions: ['todo'],
  type: FileType.custom

);
if (result == null || result.files.isEmpty) {
  return;
}
final path = result.files[0].path;
// 1
if (path != null) {
  // 2
  final file = File(path);
  // 3
  if (await file.exists()) {
    // 4
    final repository = ref.read(repositoryProvider);
    // 5
    file.readAsString().then((String contents) async {
      // 6
      final jsonArray = jsonDecode(contents) as List<dynamic>;
      // 7
      await Future.forEach(jsonArray, (value) async  {
        final map = value as Map<String, dynamic>;
        var list = TodoList.fromJson(map);
        // 8
        list = list.copyWith(id: -1);
        // 9
        final todoListId = await repository.addTodoList(list);
        // 10
        await Future.forEach(list.categories, (category) async {
          // 11
          category = category.copyWith(id: -1, todoList: todoListId);
          // 12
          final categoryId = await repository.addCategory(category);
          await Future.forEach(category.todos, (todo) async {
          	todo = todo.copyWith(id: -1, category: categoryId);
            await repository.addTodo(todo);
          });
        });
      });
    });
  }
}