Xamarin Forms Android 关闭时未收到推送通知 [英] Xamarin Forms Android not receiving Push notifications when closed

问题描述

我正在按照此演练在 Xamarin 表单应用程序中创建推送通知

I am following this walkthrough for creating push notifications into a Xamarin forms app

https://docs.microsoft.com/en-us/azure/notification-hubs/notification-hubs-android-push-notification-google-fcm-get-started

我已成功与 NotificationHub 集成，并且可以在应用处于焦点或后台时在设备上接收测试消息

I have successfully integrated with NotificationHub and can receive test messages on the device when app is in focus or in background

但是，我无法设法让应用唤醒以接收消息，这是收到通知的主要原因

I cannot, however, manage to make the app wake in order to receive messages, which is the main reason for having notifications

关于这个问题的帖子很多，我花了一个下午阅读了很多帖子，但我还没有找到任何有效的东西，即使其他人坚持这样做.

There are a great many posts about this issue and I have spent the afternoon reading a lot of them, but I have yet to find anything that works, even when others insist they do.

我在摩托罗拉设备上构建，而不是模拟器

I am building on a Motorola device, not an emulator

我的清单部分看起来像这样:

My manifest looks, in part, like this:

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="com.google.android.c2dm.permission.RECEIVE" />
<uses-permission android:name="android.permission.WAKE_LOCK" />
<uses-permission android:name="android.permission.GET_ACCOUNTS"/>

<receiver android:name="com.google.firebase.iid.FirebaseInstanceIdInternalReceiver" android:exported="false" />
<receiver android:name="com.google.firebase.iid.FirebaseInstanceIdReceiver" android:exported="true" android:permission="com.google.android.c2dm.permission.SEND">
  <intent-filter>
    <action android:name="com.google.android.c2dm.intent.RECEIVE" />
    <action android:name="com.google.android.c2dm.intent.REGISTRATION" />
    <category android:name="${applicationId}" />
  </intent-filter>
</receiver>

SendNotification 方法 - 我修改了示例代码以使其能够显示在 Android UI 中，它确实如此

The SendNotification method - I modified the example code to enable it to display in the Android UI, which it does

        var intent = new Intent(this, typeof(MainActivity));
        intent.AddFlags(ActivityFlags.ClearTop);
        intent.PutExtra("message", body);
        var pendingIntent = PendingIntent.GetActivity(this, 0, intent, PendingIntentFlags.OneShot);

        var notificationBuilder = new NotificationCompat.Builder(this, Authenticate.Constants.NotificationChannelName)
            .SetContentTitle("XamarinNotify Message")
            .SetSmallIcon(Resource.Drawable.ic_launcher)
            .SetContentText(body)
            .SetAutoCancel(true)
            .SetShowWhen(false)
            .SetContentIntent(pendingIntent);

        if (Build.VERSION.SdkInt >= BuildVersionCodes.O)
        {
            notificationBuilder.SetChannelId(Authenticate.Constants.NotificationChannelName);
        }

        var notificationManager = NotificationManager.FromContext(this);
        notificationManager.Notify(0, notificationBuilder.Build());

        // Awesome - this displays the message in the UI but only when the app is running

        var notificationManagerCompat = NotificationManagerCompat.From(this);
        notificationManager.Notify(0, notificationBuilder.Build());

但是，如果我强制停止应用程序，通知将永远不会到达，直到应用程序手动重新启动

However, if I force stop the app, the notification will never arrive until the app is restarted manually

我不知道:

1. 我做错了吗?
2. 如果我需要实现某种服务，它是什么?会唤醒应用程序的东西?我研究了一个带有 PeriodicWorkRequest 的 Worker，但后来无法确定这是否是正确的方法，如果是，我希望在计时器运行时调用它什么?
3. 我也查看了 BroadcastReceiver，但 Microsoft 网站上示例中使用的一些包现在已被弃用，例如 WakefulBroadcastReceiver，这导致我调查 2?

推荐答案

尝试将 JSON 密钥通知"放在对 Firebase API 的请求中，但使用数据"

try to put JSON key 'notification' in your request to firebase API but instead use 'data'

{
 "to": "/topics/journal",
 "notification": {
 "title" : "title",
 "text": "data!",
 "icon": "ic_notification"
  }
}

在这种情况下，这些消息仅在您的应用处于前台

in this case,these messages trigger the onMessageReceived() callback only when your app is in foreground

{
 "to": "/topics/dev_journal",
 "data": {
   "text":"text",
   "title":"",
   "line1":"Journal",
   "line2":"刊物"
  }
}   

在这种情况下，这些消息会触发 onMessageReceived() 回调，即使您的应用处于 foreground/background/killed

in this case,theses messages trigger the onMessageReceived() callback even if your app is in foreground/background/killed

但这个主题也取决于设备，FCM 无法完全控制.

but this is a topic that depends also on the device and that FCM has no total control over.

更多可以参考https://stackoverflow.com/a/37845174/10768653

和https://stackoverflow.com/a/43131488/10768653

这篇关于Xamarin Forms Android 关闭时未收到推送通知的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！