Question

我正在尝试从服务器应用程序向移动应用程序发送简单的发送通知。我的移动应用程序是使用Xamarin.Android实现的，对于服务器应用程序，我使用的是简单的.NET控制台应用程序，只是为了将通知传递给Google云消息传递。

这是我的服务器应用代码：

class Program
{
    public const string API_KEY = "MYAPICODE";
    public const string MESSAGE = "Hello world!";

    public static void Main(string[] args)
    {
        var jGcmData = new JObject();
        var jData = new JObject();

        jData.Add("message", MESSAGE);
        jGcmData.Add("to", "/topics/global");
        jGcmData.Add("data", jData);

        var url = new Uri("https://gcm-http.googleapis.com/gcm/send");
        try
        {
            using (var client = new HttpClient())
            {
                client.DefaultRequestHeaders.Accept.Add(
                    new MediaTypeWithQualityHeaderValue("application/json"));

                client.DefaultRequestHeaders.TryAddWithoutValidation(
                    "Authorization", "key=" + API_KEY);

                Task.WaitAll(client.PostAsync(url,
                    new StringContent(jGcmData.ToString(), Encoding.GetEncoding(0), "application/json"))
                    .ContinueWith(response =>
                    {
                        Console.WriteLine(response);
                    }));
            }
        }
        catch (Exception e)
        {
            Console.WriteLine("Unable to send GCM message:");
        }

    }
}

在客户端，我在Manifest文件中有这个：

<?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="za.co.beemobile.mylegislature" android:installLocation="auto">
    <uses-sdk android:minSdkVersion="14" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
    <uses-permission android:name="com.google.android.c2dm.permission.RECEIVE" />
    <uses-permission android:name="android.permission.WAKE_LOCK" />
    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.WRITE_SECURE_SETTINGS" />
    <uses-permission android:name="android.permission.RECEIVE_WAP_PUSH" />
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
    <user-premission android:name="za.co.beemobile.mylegislature.permission.C2D_MESSAGE" />
    <permission android:name="za.co.beemobile.mylegislature.permission.C2D_MESSAGE" android:protectionLevel="signature" />
    <application android:label="My Legislature" android:icon="@drawable/my_parliament">
        <meta-data android:name="com.google.android.gms.version" android:value="@integer/google_play_services_version" />
        <receiver android:name="com.google.android.gms.gcm.GcmReceiver" 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.android.c2dm.intent.GCM_RECEIVED_ACTION"/> 
                <category android:name="za.co.beemobile.mylegislature" />
            </intent-filter>
        </receiver>
    </application>
</manifest>

这是我在客户端上使用的代码：

[Service(Exported = false)]
class RegistrationIntentService : IntentService
{
    static object locker = new object();
    private const string SENDER_ID = "MYSENDERID";
    public RegistrationIntentService() : base("RegistrationIntentService") { }

    protected override void OnHandleIntent(Intent intent)
    {
        try
        {
            Log.Info("RegistrationIntentService", "Calling InstanceID.GetToken");
            lock (locker)
            {
                var instanceID = InstanceID.GetInstance(this);
                var token = instanceID.GetToken(
                    SENDER_ID, GoogleCloudMessaging.InstanceIdScope, null);

                Log.Info("RegistrationIntentService", "GCM Registration Token: " + token);
                SendRegistrationToAppServer(token);
                Subscribe(token);
            }
        }
        catch (Exception e)
        {
            Log.Debug("RegistrationIntentService", "Failed to get a registration token");
            return;
        }
    }

    void SendRegistrationToAppServer(string token)
    {
        // Add custom implementation here as needed.
    }

    void Subscribe(string token)
    {
        var pubSub = GcmPubSub.GetInstance(this);
        pubSub.Subscribe(token, "/topics/global", null);
    }
}

这是来自MyLegislatureInstanceIDListenerService.cs class：

的代码

[Service(Exported = true), IntentFilter(new[] { "com.google.android.gms.iid.InstanceID" })]
public class MyLegislatureInstanceIDListenerService : InstanceIDListenerService
{
    public override void OnTokenRefresh()
    {
        var intent = new Intent(this, typeof(RegistrationIntentService));
        StartService(intent);
    }
}

这就是事件代码的地方：

[Service(Exported = false), IntentFilter(new[] { "com.google.android.c2dm.intent.RECEIVE" })]
public class MyGcmListenerService : GcmListenerService
{
    public override void OnMessageReceived(string from, Bundle data)
    {
        var message = data.GetString("message");
        SendNotification(message);
    }

    void SendNotification(string message)
    {
        var intent = new Intent(this, typeof(MainActivity));
        intent.AddFlags(ActivityFlags.ClearTop);
        var pendingIntent = PendingIntent.GetActivity(this, 0, intent, PendingIntentFlags.OneShot);

        var notificationBuilder = new Notification.Builder(this)
            .SetSmallIcon(Resource.Drawable.clock)
            .SetContentTitle("BEE")
            .SetContentText(message)
            .SetAutoCancel(true)
            .SetContentIntent(pendingIntent);

        var notificationManager = (NotificationManager)GetSystemService(Context.NotificationService);
        notificationManager.Notify(0, notificationBuilder.Build());
    }
}

发生的事情是，当我第一次运行代码时，消息接收事件的断点被点击，我从服务器应用程序发送的通知显示在android模拟器上。每个下一次尝试向同一个模拟器发送相同的通知都不起作用。即使从服务器向GCM发送消息，事件内的断点也从未被命中。有人有这个问题吗？我做错了什么？我希望能够多次发送此通知。

注意：即使我运行Android和服务器应用程序的新实例，也不会发送消息。

OnMessageReceived事件在GCM中只调用一次

0 个答案: