background_service

A flutter plugin for execute dart code in background.

Android

• No additional setting required.
• Support notify for bt, gps state

iOS

• Register plugins (optional)

import UIKit
import Flutter
import flutter_background_service // add this

@UIApplicationMain
@objc class AppDelegate: FlutterAppDelegate {
    /// add this
    static func registerPlugins(with registry: FlutterPluginRegistry) {
        GeneratedPluginRegistrant.register(with: registry)
    }

    override func application(
        _ application: UIApplication,
        didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
    ) -> Bool {

        AppDelegate.registerPlugins(with: self)
        SwiftBackgroundServicePlugin.setPluginRegistrantCallback { registry in
            AppDelegate.registerPlugins(with: registry)
        }

        return super.application(application, didFinishLaunchingWithOptions: launchOptions)
    }
}

• Playing audio continously

Info.plist

...
	<key>UIBackgroundModes</key>
	<array>
		<string>audio</string>
        ...
	</array>
...

Then use audioplayer plugin to play audio.

...
void main() {
  WidgetsFlutterBinding.ensureInitialized();
  BackgroundService.initialize(onStart);

  runApp(MyApp());
}

void onStart() {
  WidgetsFlutterBinding.ensureInitialized();

  final audioPlayer = AudioPlayer();

  String url =
      "https://www.mediacollege.com/downloads/sound-effects/nature/forest/rainforest-ambient.mp3";

  audioPlayer.onPlayerStateChanged.listen((event) {
    if (event == AudioPlayerState.COMPLETED) {
      audioPlayer.play(url); // repeat
    }
  });

  audioPlayer.play(url);
}
..

Usage

• Follow the example.

Warning

The code will executed in isolated process, you can't share reference between UI and Service. Use sendData and onDataReceived to communicate between service and UI.

Libraries

background_service

ble/flutter_ble_lib

Library for handling Bluetooth Low Energy functionality.