颤抖didChangeAppLifecycleState永远不会运行 [英] flutter didChangeAppLifecycleState never runs

问题描述

我实现了 WidgetsBindingObserver ，但是该应用程序从未发送到后台，因此它无法识别 AppLifecycleState.resumed

I implemented the WidgetsBindingObserver, but the app is NEVER sent to the background so it doesn't recognize the AppLifecycleState.resumed

这是当前的实现方式

  @override
  void didChangeAppLifecycleState(AppLifecycleState state) async {
    print('\n\ndidChangeAppLifecycleState');
    switch (state) {
      case AppLifecycleState.resumed:
        print('\n\nresumed');
        _mymethod();
        break;
      case AppLifecycleState.inactive:
        print('\n\ninactive');
        break;
      case AppLifecycleState.paused:
        print('\n\npaused');
        break;
      case AppLifecycleState.detached:
        print('\n\ndetached');
        break;
    }
  }

模拟该过程，我将在android中进行下一步

to simulate the process i do the next in android

1. 以--release
运行项目
2. 使用 WidgetsBindingObserver
打开窗口小部件
3. 打开其他应用(例如Chrome浏览器或手机设置)
4. 返回到应用程序

返回到应用程序后，我可以在屏幕上看到我的窗口小部件，该应用程序不会重新启动，但控制台上不会显示任何打印件，而不会出现 print('\ n \ ndidChangeAppLifecycleState'); 和 _mymethod(); 从未执行

when returning to the app i can see my widget on screen, the app doesn't restart, but NONE of the prints appears on the console not event the print('\n\ndidChangeAppLifecycleState'); and _mymethod(); is never executed

推荐答案

WidgetsBindingObserver mixin不仅需要实现接口，还需要做更多的工作.您还需要将以下内容添加到窗口小部件状态类中:

The WidgetsBindingObserver mixin requires a bit more work than merely implementing the interface. You also need to add the following to your widget state class:

@override
void initState() {
  super.initState();
  WidgetsBinding.instance.addObserver(this);
}

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

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