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Flutter plugin to detect when app(not Flutter container) goes to background or foreground

Flutter Foreground/Background Event Notifier #

Flutter plugin to detect when app(not Flutter container) goes to background or foreground.

Why #

Flutter has WidgetsBindingObserver to get notified when app changes its state from active to inactive states and back. But it is actually the state changes of the embedding Activity/ViewController rather than the whole app. So if you have a plugin that opens a new activity/view controller(eg: image picker) or in iOS if you start a FaceID prompt then WidgetsBindingObserver will report as the app is paused.

This plugin on the other hand reports the events at app level. Since most apps need only background/foreground events this plugin is implemented with just those events. In iOS, plugin reports didEnterBackgroundNotification and willEnterForegroundNotification notifications and in Android, plugin reports these using androidx.lifecycle:lifecycle-process package.

Getting Started #

Add to your pubpsec:

dependencies:
  ...
  flutter_fgbg: ^0.0.1

Use the built in Widget:

FGBGNotifier(
    onEvent: (event) {
        print(event); // FGBGType.foreground or FGBGType.background
    },
    child: ...,
)

Or consume the event stream directly:

import 'package:flutter_fgbg/flutter_fgbg.dart';

StreamSubscription<FGBGType> subscription;

...
// in initState
subscription = FGBGEvents.stream.listen((event) {
    print(event); // FGBGType.foreground or FGBGType.background
});

// in dispose
subscription.cancel();
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Flutter plugin to detect when app(not Flutter container) goes to background or foreground

Repository (GitHub)
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License

unknown (LICENSE)

Dependencies

flutter

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