Flutter:如何强制应用程序重启(在生产模式下)? [英] Flutter: how to force an application restart (in production mode)?

问题描述

在生产模式中，有没有办法强制完全重启应用程序(我不是谈论开发时的热重载！).

实际用例:

• 在初始化过程中，应用程序检测到没有网络连接.缺乏网络连接可能会阻止正确启动(例如加载外部资源，如 JSON 文件......).

• 在初始握手期间，需要下载一些重要资源的新版本(某种更新).

在这两个用例中，我希望应用程序能够完全重启，而不必在 ApplicationState 级别构建复杂的逻辑.

非常感谢您的提示.

解决方案

您可以将整个应用程序包装到一个有状态的小部件中.当你想重新启动你的应用程序时，用一个拥有不同 Key 的孩子重建那个 statefulwidget.

这会让你失去应用的整个状态.

import 'package:flutter/material.dart';无效主(){运行应用程序(重启小部件(孩子:MaterialApp(),),);}类 RestartWidget 扩展 StatefulWidget {RestartWidget({this.child});最终的 Widget 子项；静态无效重启应用程序(构建上下文上下文){context.findAncestorStateOfType<_RestartWidgetState>().restartApp();}@覆盖_RestartWidgetState createState() =>_RestartWidgetState();}class _RestartWidgetState 扩展 State<RestartWidget>{Key key = UniqueKey();无效重启应用程序(){设置状态((){键 = 唯一键()；});}@覆盖小部件构建(BuildContext 上下文){返回 KeyedSubtree(钥匙:钥匙，孩子:widget.child，);}}

在此示例中，您可以使用 RestartWidget.restartApp(context) 从任何地方重置您的应用.

In production mode, is there a way to force a full restart of the application (I am not talking about a hot reload at development time!).

Practical use cases:

• At initialization process the application detects that there is no network connection. The lack of network connectivity might have prevented a correct start up (e.g. loading of external resource such as JSON files...).

• During the initial handshaking, new versions of some important resources need to be downloaded (kind of update).

In both use cases, I would like the application to proceed with a full restart, rather than having to build a complex logic at the ApplicationState level.

Many thanks for your hints.

解决方案

You could wrap your whole app into a statefulwidget. And when you want to restart you app, rebuild that statefulwidget with a child that possess a different Key.

This would make you loose the whole state of your app.

import 'package:flutter/material.dart';

void main() {
  runApp(
    RestartWidget(
      child: MaterialApp(),
    ),
  );
}

class RestartWidget extends StatefulWidget {
  RestartWidget({this.child});

  final Widget child;

  static void restartApp(BuildContext context) {
    context.findAncestorStateOfType<_RestartWidgetState>().restartApp();
  }

  @override
  _RestartWidgetState createState() => _RestartWidgetState();
}

class _RestartWidgetState extends State<RestartWidget> {
  Key key = UniqueKey();

  void restartApp() {
    setState(() {
      key = UniqueKey();
    });
  }

  @override
  Widget build(BuildContext context) {
    return KeyedSubtree(
      key: key,
      child: widget.child,
    );
  }
}

In this example you can reset your app from everywhere using RestartWidget.restartApp(context).

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