How to call MethodChannel from an isolate created by android_alarm_manager?
It seem impossible to call directly MethodChannel through an isolate.
But, with the creation of a plugin i can achieve what i want. So the solution is to create a plugin :) !
Eng
Updated on December 21, 2022Comments
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Eng over 1 year
I tried to schedule background service. For that i used https://pub.dev/packages/android_alarm_manager. It works well.
For my example, I tried to get from my isolate (android_alarm_manager's callback) the battery level following the flutter tutorial : https://flutter.dev/docs/development/platform-integration/platform-channels?tab=android-channel-java-tab.
If I call manualy my callback it works (so I well do the Android part). If android_alarm_manager call it, I got the following error appear :
Unhandled Exception: MissingPluginException(No implementation found for method getBatteryLevel on channel net.example.com/battery)
It's weird because, from an other isolate where I used https://pub.dev/packages/flutter_downloader to download file, this plugin used MethodChannel...
Here is my code for android_alarm_manager :
import 'package:flutter/services.dart'; class AndroidManagerCallBack { static Future<void> main() async { _AndroidManagerCallBack test = _AndroidManagerCallBack(); await test.getBatteryLevel(); } } class _AndroidManagerCallBack { static const platform = const MethodChannel('net.example.com/battery'); Future<void> getBatteryLevel() async { String batteryLevel; try { final int result = await platform.invokeMethod('getBatteryLevel'); batteryLevel = 'Battery level at $result % .'; } on PlatformException catch (e) { batteryLevel = "Failed to get battery level: '${e.message}'."; } print(batteryLevel); } }
I simply call the callback like :
AndroidAlarmManager.periodic( Duration(seconds: 20), 0, AndroidManagerCallBack.main(), rescheduleOnReboot: true, wakeup: false, );
In android_alarm_manager's callback, I can call plugins which used somee MethodChannel but when I tried with my MethodChannel, I got errors...
Someone can guide me :) ?
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pitazzo over 3 yearsDid you managed to solve this? I want to call native code from an isolate, but I can't see the way of doing that, even with a plugin
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Eng over 3 yearsflutter.dev/docs/development/packages-and-plugins/… I've followed doc to create plugin :)