Firebase 云消息传递 onMessageReceived 未触发

Question

按照 Firebase dev docs 中的说明，我实现了一个扩展 FirebaseMessagingService 并覆盖 onMessageReceived 回调的服务。我在 onMessageReceived 方法的第一行中放置了一条日志消息。

应用在后台运行 我在 logcat 中看不到日志，但我看到系统尝试中发布了一条通知。

前台应用 我在系统托盘中既没有看到日志也没有看到通知

知道发生了什么吗？

清单

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

服务类

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

这是一个如何接收消息以及如何处理不同类型的代码示例。这是代码的source。

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负载在内的消息时的行为取决于应用程序是在后台还是前台，例如：

在后台时，应用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，您的应用会收到一个带有两个有效负载的消息对象。

所以，摘要是当应用程序处于后台时，您可以在系统托盘中看到通知，并且在点击通知之前看不到任何日志，但您只会看到打开活动日志而不是服务日志因为它已经执行了。

当应用程序在前台时，您可以在 logcat 中看到日志，但在系统托盘中看不到任何通知，因为您的应用程序已经打开状态，您将只收到数据负载。