Is it possible to use connectivity plugin in background process?
I don't know how to call dart code in background there is little about this in docs.
I need this functionality to sync offline data with backend whenever there is a connection wether app is in foreground or background and app is in killed state like the way Whatsapp syncs messages.
You can use existing plugins for background execution (on android & ios usually in a roughly 15 minute interval)
https://pub.dev/packages/background_fetch
There is also a article dedicated to using isolates for background executions
https://flutter.dev/docs/development/packages-and-plugins/background-processes
https://medium.com/flutter/executing-dart-in-the-background-with-flutter-plugins-and-geofencing-2b3e40a1a124
Related
I have a question about how best to structure a background process in a Flutter mobile app that can be triggered in a number of ways.
This background process has to run a web API call, or series of web API calls. The process will take 1 to 5 seconds to complete.
I want the process to be initiated when any of the following occurs:
When the app first starts
When the user initiates a 'refresh' by clicking on a button in the UI
Every hour
Any suggestions on how to structure this in a Flutter app?
You should take a look at this package: https://pub.dev/packages/flutter_background_service
It can run code in background and/or in foreground either on iOs and Android.
Background and foreground are run in isolate, so you should use mechanism provide by package to exchange data between your application and background/foreground.
I am trying to create a flutter app that sends notification every time there is new entry in stream builder, it works fine when the app is on or opened but I want it to work and receive notification even when it is not opened , I have used workmanager to make the task work in background but it is not working ...the code for it can be found here code
Flutter apps by nature are supposed to run on a UI thread or foreground. The background tasks you are asking for are features disclosed by each individual platforms.
In case of Android, you can create a a Background Service to accomplish the tasks you need to perform when application is closed. The link to the bacground service is as follows: Creating a Background Service
In case of iOS, see this link for creating a background task. Other platform implementation will be as like above, so please have a look into each platform specific background process.
UPDATE:
Please have a look into the package Flutter Background Service. This package helps to deal with background tasks setup from flutter side even when app is closed.
NOTE:
Q: Why the service not started automatically?
A: Some android device manufacturers have a custom android os for example MIUI from Xiaomi. You have to deal with that policy.
Q: Service killed by system and not respawn?
A: Try to disable battery optimization for your app.
Actually I was trying to implement background process (fetch data from api) even the app is terminated in my flutter project how can I achieve in both Android & iOS platforms.
Have you ever wanted to execute Dart code in the background—even if your app wasn’t the currently active app?
The mechanism for this feature involves setting up an isolate.
Isolates are Dart’s model for multithreading, though an isolate
differs from a conventional thread in that it doesn’t share memory
with the main program. You’ll set up your isolate for background
execution using callbacks and a callback dispatcher.
Example
but if you want do that when app terminated, you will have to wakeup app through Workmanager or some another approach like sending firebase push notification or wakeup app in scheduled time with flutter alarm manager or something like that
I'm building app that uses flutter_pllayout and adhara_socket_io
App Scenario
When app is launched, it connect to a socket and keep receiving audio urls at random times, then it plays this url, it works fine on android
Problem
but in iOS when user switch to home or any other app (when my app is in background) it seems to close the connection of the socket and continue when app become in foreground, is there any way to keep the socket connection open ?
Background tasks on iOS are very limited. Only works if you play audio constantly with the correct Info.plist details.
If you want recurrent (cron job task) client side, use: BGTaskScheduler (for iOS), one other option is using a cron job triggered push notification task (you can even user Firebase Functions for that) server side.
Official docs: BFTaskScheduler, Background Behavior iOS, Enabling Background Audio
and no, sockets connections can't keep opened all the time (not even on Android on latest versions of their OS). Again, use cron job tasks to achieve a similar behavior.
Officials docs: Android Background limitations
I am new in Flutter, I have used web_socket_channel in my app. Now I want to get notifications when the app is not running. Keeping the app running in the background is not possible, so what do you recommend me to do?
So far I found them:
Websocket Manager- They claim to open socket connection in the background, but I couldn't find enough resources to find out.
https://pub.dev/packages/websocket_manager
Background Fetch - Opens the app for a few seconds in the background periodically (15 minutes or more). I do not prefer this one actually :( .
https://pub.dev/packages/background_fetch
You can use firebase_messaging, it's easy to implement in android and got a bit of configurations to do in IOS but it's good.