收到通知后引发的运行时异常

Question

我在C# Xamarin.Android项目上实现了推送通知，就像他们在官方Firebase文档中所做的那样。

您可以使用

Firebase 控制台发送通知。现在，我尝试从另一个 C# 服务发送消息。设备监视器显示 GCM 消息已传递。

请参阅安卓设备监视器消息：https://i.stack.imgur.com/9Hm1H.jpg

这是我的代码。为什么会这样？

安卓清单.xml

<application android:label="myApp" android:icon="@drawable/icon">
    <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" />
    <action android:name="com.google.firebase.MESSAGING_EVENT"/>
    <category android:name="${applicationId}" />
  </intent-filter>
    </receiver>
<service android:name=".MyFirebaseMessagingService">
    <intent-filter>
        <action android:name="com.google.firebase.MESSAGING_EVENT"/>
    </intent-filter>
</service>
</application>

MyFirebaseMessagingService.cs

[Service]
[IntentFilter(new[] { "com.google.firebase.MESSAGING_EVENT" })]
public class MyFirebaseMessagingService : FirebaseMessagingService
{
    const string TAG = "MyFirebaseMsgService";
    public MyFirebaseMessagingService()
    {
        Log.Debug(TAG, "Service called");
    }
    public override void OnMessageReceived(RemoteMessage message)
    {
        string msg = message.GetNotification().Body;
        Log.Debug(TAG, msg);    
    }
}

Answer 1

我让它使用此清单配置

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.xxxxx.xxxx" android:versionName="1.0.0" android:versionCode="2">
    <uses-sdk android:minSdkVersion="15" />
    <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" />
    <application android:icon="@drawable/icon" android:label="XX xXx">
        <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>
    </application>
</manifest>