xamarin 表单应用中的 Android 通知

如何解决xamarin 表单应用中的 Android 通知

我正在使用 xamarin 表单应用程序，我正在尝试开发一个带有两个按钮的 Android 通知：

• 在第一个中，您可以编写文本，并且此文本必须检索到其中一个 viewmodel。
• 第二个应该打开应用的视图。

我对 Intent 和 Android 都没有经验，到目前为止我可以用两个按钮显示通知： notification example

Android 解决方案中负责显示通知的类是 localnotifications : Ilocalnotifications 类：

class localnotifications : Ilocalnotifications
{
    const string channelId = "default";
    const string channelName = "Default";
    const string channelDescription = "The default channel for notifications.";

    ...

    bool channelInitialized = false;
    int messageId = 0;
    int replyPendingIntentId = 0;
    int photoPendingIntentId = 0;

    notificationmanager manager;

    public event EventHandler NotificationReceived;

    public static localnotifications Instance { get; private set; }

    public localnotifications() => Initialize();

    public void Initialize()
    {
        if (Instance == null)
        {
            CreateNotificationChannel();
            Instance = this;
        }
    }

    public void SendNotification(string title,string message)
    {
        if (!channelInitialized)
        {
            CreateNotificationChannel();
        }
        Show(title,message);
    }

    public void ReceiveNotification(string title,string message)
    {
        var args = new NotificationEventArgs()
        {
            Title = title,Message = message,};
        NotificationReceived?.Invoke(null,args);
    }

    private static readonly string KEY_TEXT_REPLY = "key_text_reply";

    AndroidX.Core.App.RemoteInput remoteEntryInput = new AndroidX.Core.App.RemoteInput.Builder(KEY_TEXT_REPLY)
            .SetLabel("Escribir enTrada")
            .Build();

    private Intent replyIntent;
    private Intent photoIntent;

    public void Show(string title,string message)
    {
        NotificationCompat.Builder builder = new NotificationCompat.Builder(AndroidApp.Context,channelId)
            .SetContentTitle(title)
            .SetContentText(message)
            .SetLargeIcon(BitmapFactory.DecodeResource(AndroidApp.Context.Resources,Resource.Drawable.abc_ab_share_pack_mtrl_alpha))
            .SetSmallIcon(Resource.Drawable.abc_ab_share_pack_mtrl_alpha)
            .SetDefaults((int)NotificationDefaults.sound | (int)NotificationDefaults.Vibrate);


        NotificationCompat.Action reply = CreateReplyIntent(title,message);

        builder.AddAction(reply);

        

        NotificationCompat.Action image = CreateImageIntent();

        builder.AddAction(image);

        Notification notification = builder.Build();
        manager.Notify(messageId++,notification);
    }

    NotificationCompat.Action CreateReplyIntent(string title,string message)
    {
        //replyIntent = new Intent(AndroidApp.Context,typeof(MainActivity));
        replyIntent = new Intent();
        replyIntent.PutExtra(TitleKey,title);
        replyIntent.PutExtra(MessageKey,message);

        // Build a PendingIntent for the reply action to trigger.
        PendingIntent replyPendingIntent =
            PendingIntent.Getbroadcast(AndroidApp.Context,replyPendingIntentId++,replyIntent,PendingIntentFlags.UpdateCurrent);

        // Create the reply action and add the remote input.
        return new NotificationCompat.Action.Builder(Resource.Drawable.abc_ab_share_pack_mtrl_alpha,"Escribir enTrada",replyPendingIntent)
                        .AddRemoteInput(remoteEntryInput)
                        .Build();
    }

    NotificationCompat.Action CreateImageIntent()
    {
        //photoIntent = new Intent("android.media.action.IMAGE_CAPTURE");
        photoIntent = new Intent(AndroidApp.Context,typeof(MainActivity));
        //photoIntent.SetFlags( ActivityFlags.LaunchAdjacent | Intent.FLAG_ACTIVITY_CLEAR_TASK);

        // Build a PendingIntent for the reply action to trigger.
        PendingIntent phtoPendingIntent = PendingIntent.Getbroadcast(AndroidApp.Context,photoPendingIntentId++,photoIntent,PendingIntentFlags.UpdateCurrent);

        return new NotificationCompat.Action.Builder(Resource.Drawable.abc_ab_share_pack_mtrl_alpha,"Sacar foto",phtoPendingIntent)
                        .Build();
    }

    void CreateNotificationChannel()
    {
        manager = (notificationmanager)AndroidApp.Context.GetSystemService(AndroidApp.NotificationService);

        if (Build.VERSION.SdkInt >= BuildVersionCodes.O)
        {
            var channelNameJava = new java.lang.String(channelName);
            var channel = new NotificationChannel(channelId,channelNameJava,NotificationImportance.Default)
            {
                Description = channelDescription
            };
            manager.CreateNotificationChannel(channel);
        }

        channelInitialized = true;
    }

}

不明白的是应用如何/在何处对这些 PendintIntent 做出反应，以及如何将信息从 android 解决方案传递到 xamarin 表单模型。