如何使用Flutter(在Android和iOS上)处理应用程序生命周期? [英] How to handle app lifecycle with Flutter (on Android and iOS)?

问题描述

Flutter应用程序中是否有任何Activity生命周期方法?

Are there any Activity lifecycle methods in Flutter apps?

赞:

onCreate()
onResume()
onDestroy()

或者:

viewDidload()
viewWillAppear()

使用Flutter开发应用程序时如何处理应用程序生命周期?

How to handle application lifecycle when making an app with Flutter?

推荐答案

当系统将应用程序置于后台或将应用程序返回至前景时，有一种名为

There is a method called when the system put the app in the background or return the app to foreground named didChangeAppLifecycleState.

小部件示例:

  class _AppLifecycleReactorState extends State<AppLifecycleReactor> with WidgetsBindingObserver {
  @override
  void initState() {
    super.initState();
    WidgetsBinding.instance.addObserver(this);
  }

  @override
  void dispose() {
    WidgetsBinding.instance.removeObserver(this);
    super.dispose();
  }

  AppLifecycleState _notification;

  @override
  void didChangeAppLifecycleState(AppLifecycleState state) {
    setState(() { _notification = state; });
  }

  @override
  Widget build(BuildContext context) {
    return new Text('Last notification: $_notification');
  }
}

还有 ="a href =" https://docs.flutter.io/flutter/dart-ui/AppLifecycleState-class.html"rel =" noreferrer>常量 了解应用程序可以进入的状态，例如:

Also there are CONSTANTS to know the states that an application can be in, eg:

1. 无效
2. 已暂停
3. 恢复
4. 暂停

这些常量的用法就是该常量的值，例如:

The usage of these constants would be the value of the constant e.g:

const AppLifecycleState(state)

这篇关于如何使用Flutter(在Android和iOS上)处理应用程序生命周期?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！