How to read and write a text file in Flutter

后端 未结 1 826
北海茫月
北海茫月 2021-02-08 05:56

How do you read text from a file and write text to a file?

I\'ve been learning about how to read and write text to and from a file. I found another question about readin

相关标签:
1条回答
  • 2021-02-08 06:28

    Setup

    Add the following plugin in pubspec.yaml:

    dependencies:
      path_provider: ^0.4.1
    

    Update the version number to whatever is current.

    And import it in your code.

    import 'package:path_provider/path_provider.dart';
    

    You also have to import dart:io to use the File class.

    import 'dart:io';
    

    Writing to a text file

    _write(String text) async {
      final Directory directory = await getApplicationDocumentsDirectory();
      final File file = File('${directory.path}/my_file.txt');
      await file.writeAsString(text);
    }
    

    Reading from a text file

    Future<String> _read() async {
      String text;
      try {
        final Directory directory = await getApplicationDocumentsDirectory();
        final File file = File('${directory.path}/my_file.txt');
        text = await file.readAsString();
      } catch (e) {
        print("Couldn't read file");
      }
      return text;
    }
    

    Notes

    • You can also get the path string with join(directory.path, 'my_file.txt') but you need to import 'package:path/path.dart'.
    • Flutter's Official Documentation of Reading and Writing Files
    0 讨论(0)
提交回复
热议问题