在 Firebase 控制台项目中添加 Xamarin.Android 应用程序时出现问题

Question

我第一次尝试在我的 Xamarin Forms Android 应用程序中实施 Firebase 云消息传递。

当我运行应用程序时，FirebaseApp初始化成功，解析json文件并生成token。

问题是应用程序在 Firebase 网页中的注册没有发生。注册的最后一个视图如下：

而且它永远不会停止验证应用程序是否已连接到他们的服务器。

我仔细检查了两个项目中包的名称是否相同。我将 json 文件添加到项目并将其构建操作更改为 GoogleServicesJson。我卸载并重新安装了设备中的应用程序以再次获取令牌。我试图在浏览器中关闭并重新打开 Firebase 页面。我尝试了很多次运行应用程序与我的应用程序到服务器的 Firebase 网页扫描连接，但结果总是一样。

见代码：

MainActivity.cs

namespace App2.Droid
{
    [Activity(Label = "App2", Icon = "@mipmap/icon", Theme = "@style/MainTheme", MainLauncher = true, ConfigurationChanges = ConfigChanges.ScreenSize | ConfigChanges.Orientation)]
    public class MainActivity : global::Xamarin.Forms.Platform.Android.FormsAppCompatActivity
    {
        static readonly string TAG = "MainActivity";

        internal static readonly string CHANNEL_ID = "my_notification_channel";
        internal static readonly int NOTIFICATION_ID = 100;

        protected override void OnCreate(Bundle savedInstanceState)
        {
            TabLayoutResource = Resource.Layout.Tabbar;
            ToolbarResource = Resource.Layout.Toolbar;

            base.OnCreate(savedInstanceState);

            Xamarin.Essentials.Platform.Init(this, savedInstanceState);
            global::Xamarin.Forms.Forms.Init(this, savedInstanceState);
            LoadApplication(new App());

            if (Intent.Extras != null)
            {
                foreach (var key in Intent.Extras.KeySet())
                {
                    var value = Intent.Extras.GetString(key);
                    Log.Debug(TAG, "Key: {0} Value: {1}", key, value);
                }
            }

            Log.Debug(TAG, "google app id: " + GetString(Resource.String.google_app_id));

            IsPlayServicesAvailable();

            CreateNotificationChannel();
        }

        public bool IsPlayServicesAvailable()
        {
            int resultCode = GoogleApiAvailability.Instance.IsGooglePlayServicesAvailable(this);
            if (resultCode != ConnectionResult.Success)
            {
                if (GoogleApiAvailability.Instance.IsUserResolvableError(resultCode))
                    Log.Debug(TAG, GoogleApiAvailability.Instance.GetErrorString(resultCode));
                else
                {
                    Log.Debug(TAG, "This device is not supported");
                    Finish();
                }
                return false;
            }
            else
            {
                Log.Debug(TAG, "Google Play Services is available.");
                return true;
            }
        }

        void CreateNotificationChannel()
        {
            if (Build.VERSION.SdkInt < BuildVersionCodes.O)
            {
                // Notification channels are new in API 26 (and not a part of the
                // support library). There is no need to create a notification
                // channel on older versions of Android.
                return;
            }

            var channel = new NotificationChannel(CHANNEL_ID,
                                                  "FCM Notifications",
                                                  NotificationImportance.Default)
            {

                Description = "Firebase Cloud Messages appear in this channel"
            };

            var notificationManager = (NotificationManager)GetSystemService(Android.Content.Context.NotificationService);
            notificationManager.CreateNotificationChannel(channel);
        }
    }
}

AndroidContent.cs

namespace App2.Droid
{
    [Service]
    [IntentFilter(new[] { "com.google.firebase.MESSAGING_EVENT" })]
    public class MyFirebaseMessagingService : FirebaseMessagingService
    {
        const string TAG = "MyFirebaseMsgService";

        public override void OnNewToken(string p0)
        {
            base.OnNewToken(p0);
            Log.Debug(TAG, p0);
        }

        public override void OnMessageReceived(RemoteMessage message)
        {
            Log.Debug(TAG, "From: " + message.From);
            Log.Debug(TAG, "Notification Message Body: " + message.GetNotification().Body);
        }
    }
}

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android" android:versionCode="1" android:versionName="1.0" package="com.companyname.app2" android:installLocation="auto">
    <uses-sdk android:minSdkVersion="26" android:targetSdkVersion="28" />
    <application android:label="App2.Android">
        <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="${applicationId}" />
            </intent-filter>
        </receiver>
    </application>
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    <uses-permission android:name="android.permission.INTERNET" />
    <permission android:name="${applicationId}.permission.C2D_MESSAGE" android:protectionLevel="signature" />
    <uses-permission android:name="${applicationId}.permission.C2D_MESSAGE" />
    <uses-permission android:name="android.permission.READ_PHONE_STATE" />
</manifest>

有人知道如何解决这个问题吗？

我正在使用：

Visual Studio 2019

Xamarin.Forms v4.7.0.1080

Xamarin.GooglePlayServices.Base v71.1610.1

Xamarin.Firebase.Messaging v71.1740.1

Answer 1

我添加了 nuget 包“Xamarin.Firebase.Analytics”，它已经工作了。每当我们使用一个在创建过程中设置了 Google Analytics 的项目时，这个包都是必需的。

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