Flutter - File IO / Delay / 가로모드

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<File IO>

dependencies:

  path_provider: ^2.0.8

 

import 'package:path_provider/path_provider.dart';

import 'dart:io';

 

_write(String text) async {

  final Directory directory = await getApplicationDocumentsDirectory();

  final File file = File('${directory.path}/my_file.txt');

  await file.writeAsString(text);

}

 

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;

}

 

---

 

<Delay>

Future.delayed(Duration(milliseconds: 1500), () {

    print('Hello');

});

 

 

---

 

<가로모드 허용하지 않음, only portrait>

SystemChrome.setPreferredOrientations(

      [DeviceOrientation.portraitUp, DeviceOrientation.portraitDown])

  .then((_) => runApp(MyApp(),

  ));