在Xamarin中，当应用程序关闭时接收推送通知

Question

在Xamarin中，当应用程序关闭时接收推送通知

androidgoogle-cloud-messagingxamarin.forms

5

我将尝试在Xamarin中处理GCM推送通知，即使应用程序完全关闭也能够接收到。遵循Xamarin推送通知教程，我能够从GCM接收远程/推送通知，但是一旦我关闭应用程序，就无法接收通知。到目前为止，我尝试了以下方法：

1.广播接收器：

    public class MyGCMBroadcastReceiver : BroadcastReceiver {

    public override void OnReceive (Context context, Intent intent)
    {
        Intent gcmListenerServiceIntent = new Intent(context,typeof(MyGcmListenerService));
        Console.WriteLine ("Starting Broadcast Receiver...");
        context.StartService (gcmListenerServiceIntent);
    }
}

Manifest:

<uses-permission android:name="android.permission.WAKE_LOCK" />
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
<uses-permission android:name="za.co.snappyhome.snappy.permission.C2D_MESSAGE" />
<uses-permission android:name="com.google.android.c2dm.permission.RECEIVE" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_LOCATION_EXTRA_COMMANDS" />
<uses-permission android:name="android.permission.ACCESS_MOCK_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.CALL_PHONE" />
<uses-permission android:name="android.permission.CALL_PRIVILEGED" />
<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.VIBRATE" />
<application android:label="My App" android:theme="@style/AppTheme" android:icon="@drawable/icon">
<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" />
        <category android:name="za.co.myapp.app" />
    </intent-filter>
</receiver>
<receiver android:name="MyApp.Droid.Notifications.MyGCMBroadcastReceiver">
    <intent-filter>
       <actionandroid:name="android.intent.action.BOOT_COMPLETED"/>                  
    </intent-filter>
</receiver>
</application>

GCMListenerService:

[Service (Exported = false), IntentFilter (new [] { "com.google.android.c2dm.intent.RECEIVE" })]
public class MyGcmListenerService : GcmListenerService
{

public override void OnMessageReceived (string from, Bundle data)
{
    if (data.ContainsKey ("data")) {

        if (Xamarin.Forms.Application.Current != null) {
            String json = data.GetString("data");

            MessagingCenter.Send<Xamarin.Forms.Application, string> (Xamarin.Forms.Application.Current,
                "NOTIFICATION_MESSAGE_RECEIVED", json);                 
        }
    }
}

}

我还在努力掌握Xamarin和GCM通知，所以我的理解可能有误。我理解的是，当应用启动时，可以启动广播接收器，然后这会进而启动一个服务来监听推送通知（在我的情况下是MyGcmListenerService）。我的第一个问题是，广播接收器在应用启动时并没有启动（按照以下答案：Trying to start a service on boot on Android）。其次，是否可以调用MyGcmListenerService来开始监听通知，就像我正在尝试的那样。我已经尝试使用GCMIntentService，但这似乎已经过时了： Push Notifications when app is closed 非常感谢你的帮助！

- nyatzanger

1个回答

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- SPS · Accepted Answer

我在使用Xamarin Native - Android时，采用了以下配置和代码片段，即使应用程序关闭，也能看到通知。

Android manifest.xml

<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>

<service android:name="HEET.Droid.ViewController.Login.FireBaseIIDService" android:permission="false" android:stopWithTask="false">
            <intent-filter>
                <action android:name="com.google.firebase.messaging_event" />
            </intent-filter>
        </service>

FireBaseIIDService.cs

根据最新版本，在FireBaseIIDService意图服务类中，每当接收到消息时都会调用onMessageReceived(RemoteMessage msg)。

        [Service]
        [IntentFilter(new[] { "com.google.firebase.MESSAGING_EVENT" })]
        public class FireBaseIIDService : FirebaseMessagingService{

   public override void OnMessageReceived (RemoteMessage msg) {
Notification.Builder builder = new Notification.Builder(this, "my_notification_channel");
            builder.SetSmallIcon(Resource.Drawable.circle);
            var intent = new Intent(this, typeof(DashboardActivity));
            intent.AddFlags(ActivityFlags.ClearTop);
            PendingIntent pendingIntent = PendingIntent.GetActivity(this, 0, intent, 0);
            builder.SetContentIntent(pendingIntent);
            builder.SetLargeIcon(BitmapFactory.DecodeResource(Resources, Resource.Drawable.circle));
            builder.SetContentTitle(Header);
            builder.SetContentText(body);
            builder.SetDefaults(NotificationDefaults.Sound);
            builder.SetAutoCancel(true);
            NotificationManager notificationManager = (NotificationManager)GetSystemService(NotificationService);
            notificationManager.Notify(1, builder.Build());
    }
    }