未触发Firebase云消息onMessageReceived

Question

按照Firebase开发文档中的说明，我已经实现了一个扩展Firebase MessagingService的服务，并覆盖了onMessageRec的回调。我已经将一条Log消息放在onMessageRec的方法的第一行中。

应用程序在后台运行我没有在logcat中看到日志，但我看到系统中发布了一个通知。

应用程序在前台我既没有看到日志也没有通知在系统托盘

知道这是怎么回事吗？

清单

   <service
        android:name=".fcm.MovieMessagingService">
        <intent-filter>
            <action android:name="com.google.firebase.MESSAGING_EVENT"/>
        </intent-filter>
    </service>

服务等级

public class MovieMessagingService extends FirebaseMessagingService {

    private static final String LOG_TAG = MovieMessagingService.class.getSimpleName();

    @Override
    public void onMessageReceived(RemoteMessage remoteMessage) {


        Log.d(LOG_TAG, "From: " + remoteMessage.getFrom());

    }

    /**
     * Create and show a simple notification containing the received FCM message.
     *
     * @param messageBody FCM message body received.
     */
    private void sendNotification(String messageBody) {
        Log.d(LOG_TAG, "Presenting Notification with message body: " + messageBody);
//more code
    }
}

Answer 1

下面是一个如何接收消息以及如何处理不同类型消息的代码示例。下面是代码的源代码。

public class MyFirebaseMessagingService extends FirebaseMessagingService {

private static final String TAG = "MyFirebaseMsgService";

/**
 * Called when message is received.
 *
 * @param remoteMessage Object representing the message received from Firebase Cloud Messaging.
 */
// [START receive_message]
@Override
public void onMessageReceived(RemoteMessage remoteMessage) {
    // [START_EXCLUDE]
    // There are two types of messages data messages and notification messages. Data messages are handled
    // here in onMessageReceived whether the app is in the foreground or background. Data messages are the type
    // traditionally used with GCM. Notification messages are only received here in onMessageReceived when the app
    // is in the foreground. When the app is in the background an automatically generated notification is displayed.
    // When the user taps on the notification they are returned to the app. Messages containing both notification
    // and data payloads are treated as notification messages. The Firebase console always sends notification
    // messages. For more see: https://firebase.google.com/docs/cloud-messaging/concept-options
    // [END_EXCLUDE]

    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());
    }

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

}

Answer 2

实际上，应用程序在接收包括通知和数据有效载荷的消息时的行为取决于应用程序是在后台还是前台，如：

在后台时，应用会在通知托盘中接收通知负载，并且仅在用户点击通知时处理数据负载。

在前台时，应用会接收一个消息对象，该对象同时附加了两个有效载荷。

因此，总结是当应用程序在后台时，您可以在系统托盘中看到通知，在点击通知之前无法看到任何日志，但您将只看到打开的活动日志，而不是服务日志，因为它已经执行。

当应用程序位于前台时，您可以在logcat中看到登录，但在系统托盘中看不到任何通知，因为您的应用程序已处于打开状态，您将只收到数据有效负载。