如何在通知中显示图像

Question

我最近在我的应用程序中使用了 FirebasePushNotificationPlugin，一切都很好...... 但是当我发送通知时，图像不显示，所有其他文本都显示 我已经搜索并尝试过但无济于事： 这是该工具的链接： https://github.com/CrossGeeks/FirebasePushNotificationPlugin 这是我的代码： 安卓：

[Application]
public class MainApplication : Application
{
    public MainApplication(IntPtr handle, JniHandleOwnership transer) : base(handle, transer)
    {
    }

    public override void OnCreate()
    {
        base.OnCreate();

        //Set the default notification channel for your app when running Android Oreo
        if (Build.VERSION.SdkInt >= BuildVersionCodes.O)
        {
            //Change for your default notification channel id here
            FirebasePushNotificationManager.DefaultNotificationChannelId = "GeneralChannel";
            //Change for your default notification channel name here
            FirebasePushNotificationManager.DefaultNotificationChannelName = "General";
            FirebasePushNotificationManager.DefaultNotificationChannelImportance = NotificationImportance.Max;
        }
        //If debug you should reset the token each time.
#if DEBUG
            FirebasePushNotificationManager.Initialize(this, true);
#else
            FirebasePushNotificationManager.Initialize(this, false);
#endif

        //Handle notification when app is closed here
        CrossFirebasePushNotification.Current.OnNotificationReceived += Current_OnNotificationReceived;

    }

    private void Current_OnNotificationReceived(object source, FirebasePushNotificationDataEventArgs e)
    {
       
    }
}

主活动：

FirebasePushNotificationManager.ProcessIntent(this, Intent);

在后端我使用了 FireBase 管理插件：

public async void SendToAllUser(Notification notification, Dictionary<string, string> MsgData)
        {
            var message = new Message()
            {
                Data = MsgData,
                Topic = "all",
                Notification = notification,
                Apns = new ApnsConfig
                {
                    Aps = new Aps
                    {
                        ContentAvailable = true,
                        MutableContent = true 
                    }
                }
            };
            string response = await FirebaseMessaging.DefaultInstance.SendAsync(message);
            Console.WriteLine("Successfully sent message: " + response);
        }

通知控制器：

[HttpPost("UserName={UserName}&Password={Password}&Key={Key}&Value={Value}")]
        public ActionResult<Notification> SendToAllDevice(string UserName, string Password, string Key, string Value, Notification notification)
        {
            int UserRole = URole.CheckUserRolee(UserName, Password);
            if (UserRole != 1)
            {
                return StatusCode(403);
            }
            var Dataa = new Dictionary<string, string>() { { Key, Value } };
            SendFCMessage.SendToAllUser(notification, Dataa);
            return Ok();
        }

Answer 1

确保您在 FCM 控制台中添加键和值（图像 url）并使用您编写的服务进行处理。

可以参考这个问题https://docs.microsoft.com/en-us/answers/questions/541284/xamarin-forms-firebase-notification-ui.html

这里还有一个示例：https://github.com/xamarin/monodroid-samples/tree/main/Firebase/FCMNotifications/FCMNotifications

编辑：

 <meta-data android:name="com.google.firebase.messaging.default_notification_channel_id" android:value="@string/notification_channel_id" />