android - Firebase中应用程序在后台时如何处理通知

这是我的 list :

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

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

当应用程序在后台并且通知到达时，默认通知会出现并且不运行我的 onMessageReceived 代码.
这是我的onMessageReceived代码。如果我的应用程序在前台运行，而不是在后台运行，则会调用此方法。当应用程序也在后台时，如何运行此代码？

// [START receive_message]
@Override
public void onMessageReceived(RemoteMessage remoteMessage) {
    // TODO(developer): Handle FCM messages here.
    // If the application is in the foreground handle both data and notification messages here.
    // 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.
    data = remoteMessage.getData();
    String title = remoteMessage.getNotification().getTitle();
    String message = remoteMessage.getNotification().getBody();
    String imageUrl = (String) data.get("image");
    String action = (String) data.get("action");
    Log.i(TAG, "onMessageReceived: title : "+title);
    Log.i(TAG, "onMessageReceived: message : "+message);
    Log.i(TAG, "onMessageReceived: imageUrl : "+imageUrl);
    Log.i(TAG, "onMessageReceived: action : "+action);

    if (imageUrl == null) {
        sendNotification(title,message,action);
    } else {
        new BigPictureNotification(this,title,message,imageUrl,action);
    }
}
// [END receive_message]

---

Best Answer-推荐答案

1. 为什么会这样？

FCM(Firebase Cloud Messaging)中有两种类型的消息:

显示消息 : 这些消息触发 onMessageReceived()仅当您的应用位于 时回调前景

数据信息 : 这些消息触发 onMessageReceived()回调 甚至如果您的应用位于 前景/背景/杀死

NOTE: Firebase team have not developed a UI to send data-messages to your devices, yet. You should use your server for sending this type!

2. 怎么做？

为此，您必须执行 POST请求以下 URL:

POST https://fcm.googleapis.com/fcm/send

header

key : Content-Type , 值(value): application/json

key : Authorization , 值(value): key=<your-server-key>

正文使用主题

{
    "to": "/topics/my_topic",
    "data": {
        "my_custom_key": "my_custom_value",
        "my_custom_key2": true
     }
}

或者，如果您想将其发送到特定设备

{
    "data": {
        "my_custom_key": "my_custom_value",
        "my_custom_key2": true
     },
    "registration_ids": ["{device-token}","{device2-token}","{device3-token}"]
}

NOTE: Be sure you're not adding JSON key notification
NOTE: To get your server key, you can find it in the firebase console: Your project -> settings -> Project settings -> Cloud messaging -> Server Key

3. 推送通知消息如何处理？

这是您处理收到的消息的方式:

@Override
public void onMessageReceived(RemoteMessage remoteMessage) { 
     Map<String, String> data = remoteMessage.getData();
     String myCustomKey = data.get("my_custom_key");

     // Manage data
}

关于android - Firebase中应用程序在后台时如何处理通知，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/37711082/