当应用程序在 Firebase 后台运行时如何处理通知

这是我的清单：

<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，默认通知就会出现并且不会运行我的代码onMessageReceived.

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，则会调用此函数。当应用程序也在后台运行时，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]

1. 为什么会出现这种情况？

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

1. 显示消息：这些消息会触发onMessageReceived()仅当您的应用程序处于运行状态时回调前景
2. 数据信息：这些消息会触发onMessageReceived()打回来even如果您的应用程序位于前景/背景/被杀死

NOTE:Firebase 团队尚未开发 UI 来发送data-messages到 您的设备还没有。您应该使用您的服务器来发送此类型！

2. 怎样做？

为了实现这一点，您必须执行POST请求以下 URL：

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

Headers

• Key: Content-Type, Value: application/json
• Key: Authorization, 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:确保你是不添加JSON 密钥notification
NOTE:要获取服务器密钥，您可以在 firebase 控制台中找到它：Your project -> settings -> Project settings -> Cloud messaging -> Server Key

3. 如何处理推送通知消息？

这是处理收到消息的方式：

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

     // Manage data
}