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feat(remote-config)!: add support for
onConfigUpdated (#10647)
This PR is a breaking change for Remote Config since we're removing the ChangeNotifier mixin that came with FirebaseRemoteConfig. You should handle the state of the RemoteConfig using your own state provider.
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169 changes: 169 additions & 0 deletions
169
packages/firebase_remote_config/firebase_remote_config/example/lib/home_page.dart
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,169 @@ | ||
| // Copyright 2019 The Chromium Authors. All rights reserved. | ||
| // Use of this source code is governed by a BSD-style license that can be | ||
| // found in the LICENSE file. | ||
| import 'dart:async'; | ||
|
|
||
| import 'package:firebase_remote_config/firebase_remote_config.dart'; | ||
| import 'package:flutter/material.dart'; | ||
| import 'package:flutter/services.dart'; | ||
|
|
||
| class HomePage extends StatefulWidget { | ||
| const HomePage({Key? key}) : super(key: key); | ||
|
|
||
| @override | ||
| State<HomePage> createState() => _HomePageState(); | ||
| } | ||
|
|
||
| class _HomePageState extends State<HomePage> { | ||
| StreamSubscription? subscription; | ||
| RemoteConfigUpdate? update; | ||
|
|
||
| @override | ||
| Widget build(BuildContext context) { | ||
| return Scaffold( | ||
| appBar: AppBar( | ||
| title: const Text('Remote Config Example'), | ||
| ), | ||
| body: Column( | ||
| children: [ | ||
| _ButtonAndText( | ||
| defaultText: 'Not initialized', | ||
| buttonText: 'Initialize', | ||
| onPressed: () async { | ||
| final FirebaseRemoteConfig remoteConfig = | ||
| FirebaseRemoteConfig.instance; | ||
| await remoteConfig.setConfigSettings( | ||
| RemoteConfigSettings( | ||
| fetchTimeout: const Duration(seconds: 10), | ||
| minimumFetchInterval: const Duration(hours: 1), | ||
| ), | ||
| ); | ||
| await remoteConfig.setDefaults(<String, dynamic>{ | ||
| 'welcome': 'default welcome', | ||
| 'hello': 'default hello', | ||
| }); | ||
| RemoteConfigValue(null, ValueSource.valueStatic); | ||
| return 'Initialized'; | ||
| }, | ||
| ), | ||
| _ButtonAndText( | ||
| defaultText: 'No data', | ||
| onPressed: () async { | ||
| try { | ||
| final FirebaseRemoteConfig remoteConfig = | ||
| FirebaseRemoteConfig.instance; | ||
| // Using zero duration to force fetching from remote server. | ||
| await remoteConfig.setConfigSettings( | ||
| RemoteConfigSettings( | ||
| fetchTimeout: const Duration(seconds: 10), | ||
| minimumFetchInterval: Duration.zero, | ||
| ), | ||
| ); | ||
| await remoteConfig.fetchAndActivate(); | ||
| return 'Fetched: ${remoteConfig.getString('welcome')}'; | ||
| } on PlatformException catch (exception) { | ||
| // Fetch exception. | ||
| print(exception); | ||
| return 'Exception: $exception'; | ||
| } catch (exception) { | ||
| print(exception); | ||
| return 'Unable to fetch remote config. Cached or default values will be ' | ||
| 'used'; | ||
| } | ||
| }, | ||
| buttonText: 'Fetch Activate', | ||
| ), | ||
| _ButtonAndText( | ||
| defaultText: update != null | ||
| ? 'Updated keys: ${update?.updatedKeys}' | ||
| : 'No data', | ||
| onPressed: () async { | ||
| try { | ||
| final FirebaseRemoteConfig remoteConfig = | ||
| FirebaseRemoteConfig.instance; | ||
| if (subscription != null) { | ||
| await subscription!.cancel(); | ||
| setState(() { | ||
| subscription = null; | ||
| }); | ||
| return 'Listening cancelled'; | ||
| } | ||
| setState(() { | ||
| subscription = remoteConfig.onConfigUpdated.listen((event) { | ||
| setState(() { | ||
| update = event; | ||
| }); | ||
| }); | ||
| }); | ||
|
|
||
| return 'Listening, waiting for update...'; | ||
| } on PlatformException catch (exception) { | ||
| // Fetch exception. | ||
| print(exception); | ||
| return 'Exception: $exception'; | ||
| } catch (exception) { | ||
| print(exception); | ||
| return 'Unable to listen to remote config. Cached or default values will be ' | ||
| 'used'; | ||
| } | ||
| }, | ||
| buttonText: subscription != null ? 'Cancel' : 'Listen', | ||
| ) | ||
| ], | ||
| ), | ||
| ); | ||
| } | ||
| } | ||
|
|
||
| class _ButtonAndText extends StatefulWidget { | ||
| const _ButtonAndText({ | ||
| Key? key, | ||
| required this.defaultText, | ||
| required this.onPressed, | ||
| required this.buttonText, | ||
| }) : super(key: key); | ||
|
|
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| final String defaultText; | ||
| final String buttonText; | ||
| final Future<String> Function() onPressed; | ||
|
|
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| @override | ||
| State<_ButtonAndText> createState() => _ButtonAndTextState(); | ||
| } | ||
|
|
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| class _ButtonAndTextState extends State<_ButtonAndText> { | ||
| String? _text; | ||
|
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| // Update text when widget is updated. | ||
| @override | ||
| void didUpdateWidget(covariant _ButtonAndText oldWidget) { | ||
| super.didUpdateWidget(oldWidget); | ||
| if (widget.defaultText != oldWidget.defaultText) { | ||
| setState(() { | ||
| _text = widget.defaultText; | ||
| }); | ||
| } | ||
| } | ||
|
|
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| @override | ||
| Widget build(BuildContext context) { | ||
| return Padding( | ||
| padding: const EdgeInsets.all(8), | ||
| child: Row( | ||
| children: [ | ||
| Text(_text ?? widget.defaultText), | ||
| const Spacer(), | ||
| ElevatedButton( | ||
| onPressed: () async { | ||
| final result = await widget.onPressed(); | ||
| setState(() { | ||
| _text = result; | ||
| }); | ||
| }, | ||
| child: Text(widget.buttonText), | ||
| ), | ||
| ], | ||
| ), | ||
| ); | ||
| } | ||
| } |
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