How to get image notifications when we trigger notifications from postman? - flutter

Question

I am integrating notifications into my applications. Initially, I used firebase I got image notifications in 3 states i.e., on foreground(Local Notifications) background, and terminated state. But when I trigger a notification from postman I am getting a notification for the foreground. But in the background and terminated state, I am getting plain notifications with no image. I am getting the image URL in the data.
import 'dart:convert';
import 'package:authentication/utils/shared_utils.dart';
import 'package:authentication/utils/utils.dart';
import 'package:firebase_messaging/firebase_messaging.dart';
import 'package:flutter/material.dart';
import 'package:flutter_local_notifications/flutter_local_notifications.dart';
import '../presentation/authentication/login/login_view.dart';
import 'package:authentication/utils/routes/routes.dart';
class NotificationHelper {
FirebaseMessaging messaging = FirebaseMessaging.instance;
String notificationText;
AndroidBitmap androidBitmap;
final FlutterLocalNotificationsPlugin flutterLocalNotificationsPlugin =
FlutterLocalNotificationsPlugin();
AndroidNotificationChannel channel = AndroidNotificationChannel(
'high_importance_channel', // id
'High Importance Notifications', // title
description:
'This channel is used for important notifications.', // description
importance: Importance.max,
playSound: true);
Future initializeFCM(String userId) async {
_initSettings(userId);
///handle messages when app is in foreground
_handleAndroidForegroundNotification();
_handleIosForegroundNotification();
///handle messages when app opened either from background or terminated state.
_onMessageOpened();
_onTerminated();
}
_initSettings(String userId) {
String uId = userId + "userSpecific";
messaging.subscribeToTopic("public");
messaging.subscribeToTopic(uId);
messaging.getToken().then((value) {
print("fcm token >>> " + value);
});
final AndroidInitializationSettings initializationSettingsAndroid =
AndroidInitializationSettings('app_icon');
final IOSInitializationSettings initializationSettingsIOS =
IOSInitializationSettings(
requestBadgePermission: false,
requestAlertPermission: false,
onDidReceiveLocalNotification: _onDidReceiveLocalNotification,
);
final InitializationSettings initializationSettings =
InitializationSettings(
android: initializationSettingsAndroid,
iOS: initializationSettingsIOS,
macOS: null);
flutterLocalNotificationsPlugin.initialize(initializationSettings,
onSelectNotification: _onSelectNotification);
}
Future<dynamic> _onSelectNotification(data) async {
debugPrint("OnSelect Message Log>>>>>>>.");
String userId = SharedUtils.getString('UserId');
if (userId.isEmpty && userId == "") {
SharedUtils.setString('route', data);
Navigator.push(Utils.navigatorKey.currentContext,
MaterialPageRoute(builder: (context) => LoginView()));
} else {
Navigator.of(Utils.navigatorKey.currentContext)
.push(Routes.generateRoute(data));
}
}
Future _onDidReceiveLocalNotification(
int id, String title, String body, String payload) async {
debugPrint("Did receive Message Log>>>>>>>.");
}
///handle foreground state for Android
Future _handleAndroidForegroundNotification() async {
FirebaseMessaging.onMessage.listen((RemoteMessage message) {
_showAndroidNotification(message);
});
}
///handle foreground state for iOS
Future _handleIosForegroundNotification() async {
await FirebaseMessaging.instance
.setForegroundNotificationPresentationOptions(
alert: true,
badge: true,
sound: true,
);
}
///handle background state
Future _onMessageOpened() async {
FirebaseMessaging.onMessageOpenedApp.listen((message) {
debugPrint('onMessageOpenedApp clicked!>>>>>>>>>.');
final routeFromMessage = message.data["route"];
debugPrint('Route called for background***************');
String userId = SharedUtils.getString('UserId');
if (userId.isEmpty && userId == "") {
SharedUtils.setString('route', routeFromMessage);
Navigator.push(Utils.navigatorKey.currentContext,
MaterialPageRoute(builder: (context) => LoginView()));
} else {
Navigator.of(Utils.navigatorKey.currentContext, rootNavigator: true)
.push(Routes.generateRoute(routeFromMessage));
}
});
}
///handle terminated state
static _onTerminated() {
FirebaseMessaging.instance.getInitialMessage().then((message) {
if (message != null) {
final routeFromMessage = message.data["route"];
debugPrint('Route called for terminated state***************');
String userId = SharedUtils.getString('UserId');
if (userId.isEmpty && userId == "") {
SharedUtils.setString('route', routeFromMessage);
Navigator.push(Utils.navigatorKey.currentContext,
MaterialPageRoute(builder: (context) => LoginView()));
} else {
Navigator.of(Utils.navigatorKey.currentContext)
.push(Routes.generateRoute(routeFromMessage));
}
}
});
}
/// set data to the notification UI
Future _showAndroidNotification(RemoteMessage message) async {
RemoteNotification notification = message.notification;
AndroidNotification android = message.notification?.android;
if (notification != null && android != null) {
androidBitmap = null;
if (message.data['image'] != null && message.data['image'] != '') {
var imagesBytes = await Utils.getImageBytes(message.data['image']);
androidBitmap =
ByteArrayAndroidBitmap.fromBase64String(base64.encode(imagesBytes));
} else if (message.notification.android.imageUrl != null) {
var imagesBytes =
await Utils.getImageBytes(message.notification.android.imageUrl);
androidBitmap =
ByteArrayAndroidBitmap.fromBase64String(base64.encode(imagesBytes));
}
flutterLocalNotificationsPlugin.show(
notification.hashCode,
notification.title,
notification.body,
NotificationDetails(
android: AndroidNotificationDetails(
channel.id,
channel.name,
channelDescription: channel.description,
color: Colors.blue,
styleInformation: androidBitmap != null
? BigPictureStyleInformation(androidBitmap)
: null,
playSound: true,
icon: '#mipmap/ic_launcher',
),
),
payload: message.data["route"]);
}
}
}