如何检查我的小部件屏幕何时在像 Android 中的 onResume 这样的颤动中可见 [英] How to check when my widget screen comes to visibility in flutter like onResume in Android

问题描述

在android中，如果活动可见，则调用onResume.Flutter中onResume的等价方法是什么?

In android if an activity is visible onResume is called. What is the equivalent method of onResume in Flutter?

我需要知道我的小部件屏幕何时可见，以便我可以根据它自动播放视频.我可能会转到另一个小部件屏幕，当我回来时它应该会自动播放.

I need the know when my widget screen is visible so I can auto-play a video based on that. I might go to another widget screen an when I come back it should auto-play.

我的方法是在 didUpdateWidget 中播放视频，但是即使小部件屏幕不可见，每次也会调用 didUpdateWidget.

My approach was to play the video in didUpdateWidget but didUpdateWidget is called every-time even the widget screen is not visible.

注意:我不是从 WidgetsBindingObserver 询问 didChangeAppLifecycleState，因为它为应用程序生命周期不是特定的小部件屏幕.

Note: I'm not asking about didChangeAppLifecycleState from WidgetsBindingObserver as it gives onResume etc callbacks for the app lifecycle not a particular widget screen.

推荐答案

所有问题都解决了.

从小部件树 (materialappwidget) 的根部开始，在导航器上放置一个观察者.

Put an observer on the navigator from the root of the widget tree (materialappwidget).

如果您需要更多解释，请点击此链接:https://api.flutter.dev/flutter/widgets/RouteObserver-class.html

If you need more explanation please follow this link: https://api.flutter.dev/flutter/widgets/RouteObserver-class.html

我已经在我的项目中实现了它的伟大@Sp4Rx

I have implemented in my project and its working great @Sp4Rx

// Register the RouteObserver as a navigation observer.
final RouteObserver<PageRoute> routeObserver = RouteObserver<PageRoute>();

void main() {
  runApp(MaterialApp(
    home: Container(),
    navigatorObservers: [routeObserver],
  ));
}

class RouteAwareWidget extends StatefulWidget {
  State<RouteAwareWidget> createState() => RouteAwareWidgetState();
}

// Implement RouteAware in a widget's state and subscribe it to
// the
// RouteObserver.
class RouteAwareWidgetState extends State<RouteAwareWidget> with RouteAware {
  @override
  void didChangeDependencies() {
    super.didChangeDependencies();
    routeObserver.subscribe(this, ModalRoute.of(context));
  }

  @override
  void dispose() {
    routeObserver.unsubscribe(this);
    super.dispose();
  }

  @override
  void didPush() {
    // Route was pushed onto navigator and is now topmost route.
  }

  @override
  void didPopNext() {
    // Covering route was popped off the navigator.
  }

  @override
  Widget build(BuildContext context) => Container();
}

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