Flutter 如何禁用横向方向？

Question

我想禁用横向模式。我尝试使用以下代码仅允许纵向模式。但它不适用于我的物理设备。怎么解决这个问题？

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';

void main() {
  SystemChrome.setPreferredOrientations(
      [DeviceOrientation.portraitUp, DeviceOrientation.portraitDown]);
  runApp(MyApp());
}

Answer 1

您需要将代码粘贴到

Widget build()

中。考虑这个答案了解更多细节

class MyApp extends StatelessWidget {
    @override
    Widget build(BuildContext context) {
      SystemChrome.setPreferredOrientations([
        DeviceOrientation.portraitUp,
        DeviceOrientation.portraitDown,
      ]);
      return new MaterialApp(...);
    }
  }

Answer 2

添加这行代码

WidgetsFlutterBinding.ensureInitialized();

之前

SystemChrome.setPreferredOrientations([
    DeviceOrientation.portraitDown,
    DeviceOrientation.portraitUp,
  ]);