I want to know when my user paused the application?-CodePudding

How can I access my user activity?
I want to update something on my server when my user exit from the application

I try this way but I don't know where I make mistakes, because that way doesn't work.


class _MyHomePageState extends State<MyHomePage> with WidgetsBindingObserver {

  @override
  void didChangeAppLifecycleState(AppLifecycleState state) {
    // TODO: implement didChangeAppLifecycleState
    print("----------------------------------------------------------------");
    print(state);
    print("----------------------------------------------------------------");
    super.didChangeAppLifecycleState(state);
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            const Text(
              'You have pushed the button this many times:',
            ),
            Text(
              '$_counter',
              style: Theme.of(context).textTheme.headline4,
            ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'Increment',
        child: const Icon(Icons.add),
      ),
    );
  }
}

anyone can help me?

CodePudding user response：

you have to use this in initState something like this:

  @override
  void initState() {
    WidgetsBinding.instance.addObserver(this);
    print("initstate");
    // TODO: implement initState
    super.initState();
  }

CodePudding user response：

you can use didChangeAppLifecycleState with WidgetsBindingObserver

class HomePage extends StatefulWidget {
  @override
  _HomePageState createState() => _HomePageState();
}

class _HomePageState extends State<HomePage> with WidgetsBindingObserver {
  @override
  void initState() {
    super.initState();

    // Add the observer
    WidgetsBinding.instance!.addObserver(this);
  }

  @override
  void dispose() {
    // Remove the observer
    WidgetsBinding.instance!.removeObserver(this);

    super.dispose();
  }

  @override
  void didChangeAppLifecycleState(AppLifecycleState state) {
    super.didChangeAppLifecycleState(state);

    // These are the callbacks
    switch (state) {
      case AppLifecycleState.resumed:
        // widget is resumed
        break;
      case AppLifecycleState.inactive:
        // widget is inactive
        break;
      case AppLifecycleState.paused:
        // widget is paused
        break;
      case AppLifecycleState.detached:
        // widget is detached
        break;
    }
  }

  @override
  Widget build(BuildContext context) {
     return Scaffold();
}