From d96bf2308b9225668a949eccf097e601557e29ad Mon Sep 17 00:00:00 2001
From: Kevin Wang <kevmo314@gmail.com>
Date: Fri, 15 Jul 2022 10:19:40 -0400
Subject: [PATCH] fix: more aggressively keep app in foreground (#554)

---
 android/app/src/main/AndroidManifest.xml |  3 ++-
 lib/models/audio.dart                    | 19 +++++++++++++++++++
 pubspec.lock                             |  7 +++++++
 pubspec.yaml                             |  1 +
 4 files changed, 29 insertions(+), 1 deletion(-)

diff --git a/android/app/src/main/AndroidManifest.xml b/android/app/src/main/AndroidManifest.xml
index 54ccabb74..8da99debb 100644
--- a/android/app/src/main/AndroidManifest.xml
+++ b/android/app/src/main/AndroidManifest.xml
@@ -1,9 +1,10 @@
-<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.rtirl.chat">
 
     <uses-permission android:name="android.permission.INTERNET" />
     <uses-permission android:name="android.permission.BLUETOOTH" />
     <uses-permission android:name="android.permission.FOREGROUND_SERVICE" />
     <uses-permission android:name="android.permission.WAKE_LOCK" />
+    <uses-permission android:name="android.permission.REQUEST_IGNORE_BATTERY_OPTIMIZATIONS" />
     <uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />
 
     <queries>
diff --git a/lib/models/audio.dart b/lib/models/audio.dart
index 975b5126a..3513e0486 100644
--- a/lib/models/audio.dart
+++ b/lib/models/audio.dart
@@ -4,6 +4,7 @@ import 'dart:io';
 
 import 'package:audioplayers/audioplayers.dart';
 import 'package:flutter/material.dart';
+import 'package:flutter_background/flutter_background.dart';
 import 'package:rtchat/audio_channel.dart';
 import 'package:rtchat/models/adapters/profiles.dart';
 import 'package:rtchat/models/channels.dart';
@@ -67,6 +68,7 @@ class AudioModel extends ChangeNotifier {
       _hostChannelStateSubscription = null;
       _isOnline = false;
       _syncWebViews();
+      _toggleBackground(false);
       notifyListeners();
       return;
     }
@@ -75,10 +77,27 @@ class AudioModel extends ChangeNotifier {
         .listen((isOnline) {
       _isOnline = isOnline;
       _syncWebViews();
+      _toggleBackground(isOnline);
       notifyListeners();
     });
   }
 
+  // this isn't really the best place to put this function since it applies
+  // outside audio, but it's a convenient place since we already have the listener.
+  void _toggleBackground(bool enable) async {
+    const androidConfig = FlutterBackgroundAndroidConfig(
+      notificationTitle: "RealtimeChat",
+      notificationText: "RealtimeChat is running in the background",
+    );
+    if (enable) {
+      if (await FlutterBackground.initialize(androidConfig: androidConfig)) {
+        await FlutterBackground.enableBackgroundExecution();
+      }
+    } else if (FlutterBackground.isBackgroundExecutionEnabled) {
+      await FlutterBackground.disableBackgroundExecution();
+    }
+  }
+
   bool get isSettingsVisible => _isSettingsVisible;
 
   set isSettingsVisible(bool value) {
diff --git a/pubspec.lock b/pubspec.lock
index c8192323d..bf0ef98d4 100644
--- a/pubspec.lock
+++ b/pubspec.lock
@@ -237,6 +237,13 @@ packages:
     description: flutter
     source: sdk
     version: "0.0.0"
+  flutter_background:
+    dependency: "direct main"
+    description:
+      name: flutter_background
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.1.0"
   flutter_inappwebview:
     dependency: "direct main"
     description:
diff --git a/pubspec.yaml b/pubspec.yaml
index ba6eed876..445e89770 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -39,6 +39,7 @@ dependencies:
   path_provider: ^2.0.10
   in_app_purchase: ^3.0.4
   firebase_database: ^9.0.18
+  flutter_background: ^1.1.0
 
 dev_dependencies:
   flutter_lints: ^2.0.1