当应用程序在后台运行时，不会触发onMessageReceived方法

问题描述

实际上，我需要在应用程序图标中显示徽章，但是我不知道如何获取徽章，以及为什么当应用程序在后台或应用程序未运行时onMessageReceived无法调用.

Actually i need to show badge in app icon but i don't know how to get badge and why onMessageReceived not call when app is in background or app is not running.

public class Custom_FirebaseMessagingService extends FirebaseMessagingService          {
            private static final String TAG = "FirebaseMsgService";
            String activityName;

            @Override
            public void onMessageReceived(RemoteMessage remoteMessage) {

                if (remoteMessage == null)
                    return;
                if (remoteMessage.getNotification() != null) {
                    Log.i(TAG, "Notification Body: " + remoteMessage.getNotification().getBody());
                }
                // Check if message contains a data payload.
                if (remoteMessage.getData().size() > 0) {
                    Log.i(TAG, "Data Payload: " + remoteMessage.getData().toString());
                    try{
                        //boolean from_bg = Boolean.parseBoolean(remoteMessage.getData().get("from_bg").toString());
                        Map<String, String> data = remoteMessage.getData();
                        boolean show_fg =  Boolean.parseBoolean(data.get("show_fg"));
                        .....

推荐答案

FCM有两种类型

notification消息:仅当您的应用程序处于前台状态时，发送具有此消息类型的有效负载才会触发onMessageReceived().

notification Messages: Sending a payload with this message type triggers onMessageReceived() only when your app is in foreground.

data消息:仅使用 这种特定消息类型发送有效负载会触发onMessageReceived()，无论您的应用程序是在前台/后台.

data Messages: Sending a payload with only this specific message type triggers onMessageReceived() regardless if your app is in foreground/background.

参考: https://firebase.google.com/docs /cloud-messaging/android/receive#handling_messages

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