Flutter Local Notification - Background

tfozo · July 1, 2025, 12:26pm

I have a timer, it successfully countdowns when i’m off screen in the background (app not terminated) how i do it is that i save the time when they leave and when they are back it just adds however many seconds they were gone for

Now the issue is I need the users to be notified when its done.

any way i can do this i’m currently facing issues doing that.

mihalycsaba · July 6, 2025, 2:47pm

github.com/mihalycsaba/farer_companion

lib/views/timer.dart

main

// Copyright (C) 2025 Mihaly Csaba
//
// This file is part of Farer Companion.
//
// Farer Companion is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Farer Companion is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Farer Companion.  If not, see <https://www.gnu.org/licenses/>.

import 'dart:async';

import 'package:flutter/material.dart';

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I have a Timer here, it doesn’t stop if I put the app in the background, unless the app is stopped in some way.

Unless they leave the app for a long time you could send a notification with the Timer.

If it’s a long time, long enough for the app to stop, you will need to detect when they put the app in the background, check line 112

github.com/mihalycsaba/snag

lib/views/giveaways/giveaway/giveaway_list.dart

main

// Copyright (C) 2025 Mihaly Csaba
//
// This file is part of Snag.
//
// Snag is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Snag is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Snag.  If not, see <https://www.gnu.org/licenses/>.

import 'dart:async';

import 'package:flutter/material.dart';

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Then you need to save the time when the timer will finish and check it with something like workmanager in a background task. Problem is that workmanager can only start once every 15 minutes. I’m not sure if you can delay notifications in workmanager.

tfozo · July 6, 2025, 3:17pm

My G, Thanks a lot, like a lot lot lot. I’ll see it.