Avoid potential Google Play Store ban

android/app/src/main/AndroidManifest.xml

@@ -24,11 +24,15 @@
         <intent>
             <action android:name="android.media.action.VIDEO_CAPTURE" />
         </intent>
+
+        <intent>
+            <action android:name="android.settings.IGNORE_BATTERY_OPTIMIZATION_SETTINGS" />
+        </intent>
     </queries>
 
     <!-- This is required for independent push notifications service to work
             (when FCM service can not be used) -->
-    <uses-permission android:name="android.permission.REQUEST_IGNORE_BATTERY_OPTIMIZATIONS" />
+    <uses-permission android:name="android.permission.FOREGROUND_SERVICE"/>
 
     <!-- io.flutter.app.FlutterApplication is an android.app.Application that
          calls FlutterMain.startInitialization(this); in its onCreate method.

android/app/src/main/java/org/communiquons/comunic/independentnotifications/NotificationsChannel.java

@@ -1,10 +1,8 @@
 package org.communiquons.comunic.independentnotifications;
 
-import android.annotation.SuppressLint;
 import android.app.Activity;
 import android.content.Context;
 import android.content.Intent;
-import android.net.Uri;
 import android.os.PowerManager;
 import android.provider.Settings;
 
@@ -23,9 +21,10 @@ public class NotificationsChannel implements MethodChannel.MethodCallHandler {
     @Override
     public void onMethodCall(@NonNull MethodCall call, @NonNull MethodChannel.Result result) {
         try {
+            if (call.method.equals("needPreConfiguration"))
+                result.success(needPreConfiguration());
 
-
-            if (call.method.equals("preConfigure"))
+            else if (call.method.equals("preConfigure"))
                 preConfigure(result);
 
             else
@@ -37,20 +36,26 @@ public class NotificationsChannel implements MethodChannel.MethodCallHandler {
 
     }
 
+    private boolean needPreConfiguration() {
+        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.M) {
+            if (!context.getSystemService(PowerManager.class).isIgnoringBatteryOptimizations(context.getPackageName())) {
+                return true;
+            }
+        }
+        return false;
+    }
+
     /**
      * Pre-configure independent notifications service
      */
-    private void preConfigure(@NonNull MethodChannel.Result result) throws Exception {
-        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.M) {
-            if (!context.getSystemService(PowerManager.class).isIgnoringBatteryOptimizations(context.getPackageName())) {
-                @SuppressLint("BatteryLife")
-                Intent intent = new Intent(Settings.ACTION_REQUEST_IGNORE_BATTERY_OPTIMIZATIONS,
-                        Uri.parse("package:" + context.getPackageName()));
+    private void preConfigure(@NonNull MethodChannel.Result result) {
+        if (needPreConfiguration() && android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.M) {
+            // See https://stackoverflow.com/a/41853011
+            Intent intent = new Intent(Settings.ACTION_IGNORE_BATTERY_OPTIMIZATION_SETTINGS);
             intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
 
             context.startActivity(intent);
         }
-        }
 
         result.success(null);
     }

lib/helpers/independent_push_notifications_helper.dart

@@ -1,3 +1,6 @@
+import 'package:comunic/ui/dialogs/alert_dialog.dart';
+import 'package:comunic/utils/intl_utils.dart';
+import 'package:flutter/cupertino.dart';
 import 'package:flutter/services.dart';
 
 /// Independent push notifications helper
@@ -8,11 +11,19 @@ class IndependentPushNotificationsHelper {
   static const platform = const MethodChannel(
       "org.communiquons.comunic/independent-push-notifications-service");
 
+  /// Check if a pre-configuration is required for an application
+  static Future<bool> needPreConfiguration() async {
+    return await platform.invokeMethod("needPreConfiguration");
+  }
+
   /// Call this method to prepare the application for background refresh by
   /// requesting appropriate permissions, configuring battery optimization...
   ///
   /// Throws an Exception in case of failure
-  static Future<void> preConfigure() async {
+  static Future<void> preConfigure(BuildContext context) async {
+    await alert(context,
+        tr("Battery optimization settings will appear. To make push notifications service work better, please disable battery optimization for Comunic..."));
+
     await platform.invokeMethod("preConfigure");
   }
 }

lib/ui/routes/push_notifications_route.dart

@@ -121,7 +121,8 @@ class _PushNotificationsConfigurationRouteState
           break;
 
         case PushNotificationsStatus.INDEPENDENT:
-          await IndependentPushNotificationsHelper.preConfigure();
+          if (await IndependentPushNotificationsHelper.needPreConfiguration())
+            await IndependentPushNotificationsHelper.preConfigure(context);
           break;
 
         default:

lib/ui/widgets/init_widget.dart

@@ -1,6 +1,5 @@
 import 'package:comunic/helpers/account_helper.dart';
 import 'package:comunic/helpers/events_helper.dart';
-import 'package:comunic/helpers/push_notifications_helper.dart';
 import 'package:comunic/helpers/server_config_helper.dart';
 import 'package:comunic/helpers/version_helper.dart';
 import 'package:comunic/helpers/websocket_helper.dart';
@@ -78,8 +77,8 @@ class _InitializeWidgetState extends SafeState<InitializeWidget> {
       }
 
       print("Check push notifications configuration...");
-      if (await PushNotificationsHelper.getLocalStatus() ==
-          PushNotificationsStatus.UNDEFINED)
+      /*if (await PushNotificationsHelper.getLocalStatus() ==
+          PushNotificationsStatus.UNDEFINED)*/// TODO : remove comment
         await showInitialPushNotificationsConfiguration(context);
 
       print("Attempting WebSocket connection...");