如何显示与服务器一起发送的FCM Firebase通知

Question

Firebase提供了两种放置推送通知的方法，一种是使用它的Firebase控制台，另一种是使用以前在GCM中使用的服务器。现在我们正在将我们的服务器从GCM转换为Firebase，我们需要在应用程序中接收并显示FCM通知。

我已经完成了firebase官方网站的实现，并且完成了示例代码，但是我仍然停留在这一部分上。当我们的服务器向Firebase发送推送通知，并且Firebase向我的应用程序发送通知时，我将以OnMessageReceived方法接收通知，该方法带有RemoteMessage参数。我知道消息在RemoteMessage参数内部，但我在Firebase官方文档中找不到任何关于如何处理这一点以显示android设备通知栏上的通知文本的指南或示例代码。

正如您在官方指南中所看到的，没有解释如何从RemoteMessage参数中提取没有问题的消息。我知道你可以在里面搜索并找到字符串，但我想找到一个关于如何正确和安全地处理这个的官方指南。

在正式文档中,您只有以下内容：

@Override
public void onMessageReceived(RemoteMessage remoteMessage) {    
    // TODO(developer): Handle FCM messages here.
    Log.d(TAG, "From: " + remoteMessage.getFrom());

    // Check if message contains a data payload.
    if (remoteMessage.getData().size() > 0) {
        Log.d(TAG, "Message data payload: " + remoteMessage.getData());
        // Handle message within 10 seconds    
    }

    // Check if message contains a notification payload.
    if (remoteMessage.getNotification() != null) {
        Log.d(TAG, "Message Notification Body: " + remoteMessage.getNotification().getBody());
    }

    // Also if you intend on generating your own notifications as a result of a received FCM
    // message, here is where that should be initiated. See sendNotification method below.
}

和这个（指南中没有调用它）：

   private void sendNotification(String messageBody) {
        Intent intent = new Intent(this, MainActivity.class);
        intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
        PendingIntent pendingIntent = PendingIntent.getActivity(this, 0 /* Request code */, intent,
                PendingIntent.FLAG_ONE_SHOT);

        Uri defaultSoundUri= RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
        NotificationCompat.Builder notificationBuilder =
                new NotificationCompat.Builder(this)
                        .setSmallIcon(R.drawable.ic_main)
                        .setContentTitle("FCM Message")
                        .setContentText(messageBody)
                        .setAutoCancel(true)
                        .setSound(defaultSoundUri)
                        .setContentIntent(pendingIntent);

        NotificationManager notificationManager =
                (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);

        notificationManager.notify(0 /* ID of notification */, notificationBuilder.build());
    }

Answer 1

我已经做了类似的事情我正在使用addNotifcation（）来代替sendNotification（）

public class MyFirebaseMessagingService extends FirebaseMessagingService {
private static final String TAG = "FCM Service";

@Override
public void onMessageReceived(RemoteMessage remoteMessage) {
    Log.d(TAG, "From: " + remoteMessage.getFrom());
    Log.d(TAG, "Notification Message Body: " + remoteMessage.getData().get("body"));
    addNotification(remoteMessage.getData().get("body"), remoteMessage.getData().get("Nick"));
}

private void addNotification(String message, String title) {
    NotificationCompat.Builder builder =
            (NotificationCompat.Builder) new NotificationCompat.Builder(this);
        builder.setSmallIcon(R.mipmap.ic_launcher1)
                .setContentTitle(title)
                .setContentText(message);

    Intent notificationIntent = new Intent(this, app.class);
    PendingIntent contentIntent = PendingIntent.getActivity(this, 0, notificationIntent,
            PendingIntent.FLAG_UPDATE_CURRENT);
    builder.setContentIntent(contentIntent);

    // Add as notification
    NotificationManager manager = (NotificationManager) this.getSystemService(Context.NOTIFICATION_SERVICE);
    manager.notify(0, builder.build());
}