I want to show a custom popup message whenever the user disconnects a cellular call. The problem is how to detect when the app is not running. any leads would be helpful.
It's been a while and there have been many developments.
First, there are some answers at How to create a service in Flutter to make an app to run always in background?
Also, flutter/Background processes will basically point you to medium/Executing Dart in the Background with Flutter Plugins and Geofencing (Sept 2018)
which is a Geofencing sample that involves a partnership between isolates, native Android/iOS code via MethodChannel, and PluginUtilities.getCallbackHandle (PluginUtilities)
Alas, there are many plugins available now:
https://pub.dev/packages/background_location
https://pub.dev/packages/android_alarm_manager (Android)
https://pub.dev/packages/background_fetch
https://pub.dev/packages/workmanager
https://pub.dev/packages/audio_service
Related
in my application I need to send a request to the database 2 times a day and issue a notification on the response.
The problem is that the Dart codes I wrote should work even when the app is closed. I used workmanager background service and flutter_local_notifications. On the Android system, it works without problems, but on the IOS system, it constantly causes problems. How can I make things work the way I want for both Android and iOS?
I'm building a Flutter app that will have the capability to execute some actions when the device connects to another bluetooth device. This app should work on Android and iOS but for the sake of simplicity I'll focus on Android in this post. Also, this has to work whether the app is in the foreground, in the background or killed.
Here is the architecture of the app:
I have an Android native code that registers to bluetooth events through a BroadcastReceiver.
I followed this tutorial to set up the communication between the Android code and the Flutter code: https://medium.com/#chetan882777/initiating-calls-to-dart-from-the-native-side-in-the-background-with-flutter-plugin-7d46aed32c47.
When the Android BroadcastReceiver is triggered by a bluetooth event, the information is sent to the Flutter code (even if the app was in the background or killed). A Flutter isolate is created to handle the Flutter code.
Everything works perfectly well. The Flutter code is called and I can use print(data) to log the data that have been provided by the Android code.
Things are becoming more tricky when, from the isolate, I want to call any Flutter plugin (like sqflite, package_info_plus, ...). I get this error every time:
[ERROR:flutter/lib/ui/ui_dart_state.cc(199)] Unhandled Exception:
MissingPluginException(No implementation found for method xxx on
channel yyy)
I understand that spawned isolate can't natively run Flutter plugins. There are some posts (Unable to understand Flutter Isolate workaround for "'Window_sendPlatformMessage' (4 arguments) cannot be found" error, https://github.com/flutter/flutter/issues/13937) that explain how to create isolates that can run Flutter plugins by using a workaround or a plugin like https://pub.dev/packages/flutter_isolate.
However, I can't create the isolate with this package because the isolate is created from the Android code.
Can one of you tell me how I can achieve this? Is there a way to use Flutter plugins from an isolate that has been created by native code?
Thank you very much in advance
Sounds like the way you create the Flutter isolate may not be compatible with your goal. There are some solutions to integrate Flutter with native Android/iOS projects, such as flutter_boost (disclaimer: I have not tried it and not sure good or not; you may find many other alternatives as well, this is just an example). You can use that to create the Flutter environments. Since the solutions above allow some Android code to open a new normal Flutter page and Flutter code in that page is able to do anything (of course include calling native - otherwise things like flutter_boost is really useless), this should work.
Hi i am developing a flutter application and i am using getx statemanagment. The problem is when i put application in background and use some other applications like whatsapp,youtube,play a game or listen music, after some time when i resume my application from recents it restarts and all progress is lost.
I have already tried different solutions like moveTaskToback(true) with native android function call
Please help, I have almost finished my important application.
I'm not sure on why this happens, but some manufacturers have their own restrictions on apps running in the background. Nothing you can really do from a flutter perspective, the app lifecycle is the same on all devices.
Here is a link where they share some tips how to deal with this on Xiaomi from the users perspective.
https://dontkillmyapp.com/xiaomi
From the developers perspective, as you can read on the bottom of the article, the are no common workarounds known yet.
Recently I've found out about Flutter being able to support desktop applications as well. I'm just curious how far this technology is and if any of you had success porting your mobile apps to the desktop. If so, what was the experience like? Are desktop-specific features like windows, mouse interaction, desktop notifications, etc. supported?
It was demonstrated at the Flutter Live event in December, but nothing official has been released that I'm aware of.
Flutter for Desktop was launched as alpha build at flutter interact 2019.
The official documentation is available at https://flutter.dev/desktop
The following video describes how to run your flutter app on a MacOS
You can watch the following video is you don't wanna read the docs
https://www.youtube.com/watch?v=9tEdoVuC1uQ&t=23s
(Skip to 0:48 seconds, as slight noise occurs for few seconds)
A simple app is created using android studio and we can easily see the options available to port the code to all platforms. For example, if you create a default app using android studio, the mouse event will help you to tap on a button and increase the count.
Regarding the experience, it feels good to write a single code and port/deploy on any platform. Using VSCode or android studio, both are helpful.
I have a music app that streams audio online. The only problem is it gets killed every time I exit the app which is not good for the user. They need it to keep running in the background even after exiting. How can I achieve this?
Can I run Dart code in the background of an Flutter app?
Yes, you can run Dart code in a background process on both iOS and Android. For more information, see the Medium article Executing Dart in the Background with Flutter Plugins and Geofencing.