How to create a service in Flutter to make an app to run always in background?

Question

I would like to make my Flutter application to run always in background. With android, we have to create a Service that runs always in background. I don\'t find something ab

Answer 1

• create new Flutter project.
  • create BroadcastReceiver class beside MainActivity in android dir.
  • change MainActivity.java and main.dart and AndroidManifest.xml like this

MyReceiver

    package com.example.flutter_broadcastreceiver_alarmmanager_repeat;
    import android.content.BroadcastReceiver;
    import android.content.Context;
    import android.content.Intent;
    public class MyReceiver extends BroadcastReceiver {
        @Override
        public void onReceive(Context context, Intent intent) {
            MainActivity.callFlutter();
        }
    }

MainActivity

package com.example.flutter_broadcastreceiver_alarmmanager_repeat;

import android.app.AlarmManager;
import android.app.PendingIntent;
import android.content.Intent;
import android.os.Bundle;
import io.flutter.app.FlutterActivity;
import io.flutter.plugin.common.MethodChannel;
import io.flutter.plugins.GeneratedPluginRegistrant;
import io.flutter.view.FlutterView;

public class MainActivity extends FlutterActivity {

    private PendingIntent pendingIntent;
    private AlarmManager alarmManager;
    private static  FlutterView flutterView;
    private static final String CHANNEL = "com.tarazgroup";

    @Override
    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        flutterView=getFlutterView();
        GeneratedPluginRegistrant.registerWith(this);

        Intent intent = new Intent(this, MyReceiver.class);
        pendingIntent = PendingIntent.getBroadcast(this, 1019662, intent, 0);
        alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
        alarmManager.setInexactRepeating(AlarmManager.RTC_WAKEUP, System.currentTimeMillis(), 1000, pendingIntent);

    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        alarmManager.cancel(pendingIntent);
    }

    static void callFlutter(){
        MethodChannel methodChannel=new MethodChannel(flutterView, CHANNEL);
        methodChannel.invokeMethod("I say hello every minute!!","");
    }
}

main.dart

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key}) : super(key: key);

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State {

  static const methodChannel = const MethodChannel('com.tarazgroup');

  _MyHomePageState() {
    methodChannel.setMethodCallHandler((call) {
      print(call.method);
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
      ),
      body: Container() 
    );
  }
}

AndroidManifest.xml

your flutter code calls avery 1 min. even your app minimized or switch to another app or screen off.