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[ android_alarm_manager ] Loosen Flutter SDK lower bound, update README (flutter#2338)
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‎packages/android_alarm_manager/CHANGELOG.md‎

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## 0.4.5+1
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* Loosen Flutter version restriction to 1.9.1. **NOTE: plugin registration
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for the background isolate will not work correctly for applications using the
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V2 Flutter Android embedding for Flutter versions lower than 1.12.**
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## 0.4.5
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* Add support for Flutter Android embedding V2

‎packages/android_alarm_manager/README.md‎

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memory and communication between isolates must be done via message passing (see more documentation on
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isolates [here](https://api.dart.dev/stable/2.0.0/dart-isolate/dart-isolate-library.html)).
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## Using other plugins in alarm callbacks
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If alarm callbacks will need access to other Flutter plugins, including the
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alarm manager plugin itself, it is necessary to teach the background service how
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to initialize plugins. This is done by giving the `AlarmService` a callback to call
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in the application's `onCreate` method. See the example's
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alarm manager plugin itself, it may be necessary to inform the background service how
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to initialize plugins depending on which Flutter Android embedding the application is
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using.
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### Flutter Android Embedding V1
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For the Flutter Android Embedding V1, the background service must be provided a
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callback to register plugins with the background isolate. This is done by giving
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the `AlarmService` a callback to call the application's `onCreate` method. See the example's
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[Application overrides](https://github.com/flutter/plugins/blob/master/packages/android_alarm_manager/example/android/app/src/main/java/io/flutter/plugins/androidalarmmanagerexample/Application.java).
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In particular, its `Application` class is as follows:
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```java
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**Note:** Not calling `AlarmService.setPluginRegistrant` will result in an exception being
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thrown when an alarm eventually fires.
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### Flutter Android Embedding V2 (Flutter Version >= 1.12)
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For the Flutter Android Embedding V2, plugins are registered with the background
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isolate via reflection so `AlarmService.setPluginRegistrant` does not need to be
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called.
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**NOTE: this plugin is not completely compatible with the V2 embedding on
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Flutter versions < 1.12 as the background isolate will not automatically
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register plugins. This can be resolved by running `flutter upgrade` to upgrade
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to the latest Flutter version.**
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For help getting started with Flutter, view our online
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[documentation](http://flutter.io/).
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‎packages/android_alarm_manager/pubspec.yaml‎

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name: android_alarm_manager
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description: Flutter plugin for accessing the Android AlarmManager service, and
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running Dart code in the background when alarms fire.
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version: 0.4.5
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version: 0.4.5+1
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author: Flutter Team <[email protected]>
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homepage: https://github.com/flutter/plugins/tree/master/packages/android_alarm_manager
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environment:
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sdk: ">=2.0.0-dev.28.0 <3.0.0"
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# TODO(bkonyi): set minimum Flutter version to next stable release
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flutter: ">=1.2.0 <2.0.0"
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flutter: ">=1.9.1 <2.0.0"

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