Firebase中应用程序在后台时如何处理通知

How to handle notification when app in background in Firebase(Firebase中应用程序在后台时如何处理通知)

问题描述

这是我的清单:

<service android:name=".fcm.PshycoFirebaseMessagingServices"><意图过滤器><action android:name="com.google.firebase.MESSAGING_EVENT"/></意图过滤器></服务><service android:name=".fcm.PshycoFirebaseInstanceIDService><意图过滤器><action android:name="com.google.firebase.INSTANCE_ID_EVENT"/></意图过滤器></服务>

当应用程序在后台并且通知到达时，默认通知会到来并且不会运行我的 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.当应用也在后台时如何运行此代码?

//[开始接收消息]@覆盖公共无效 onMessageReceived(RemoteMessage remoteMessage) {//TODO(developer):在此处处理 FCM 消息.//如果应用程序在前台，则在此处处理数据和通知消息.//此外，如果您打算根据收到的 FCM 生成自己的通知//消息，这里是应该启动的地方.请参阅下面的 sendNotification 方法.数据 = remoteMessage.getData();字符串标题 = remoteMessage.getNotification().getTitle();字符串消息 = 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) {发送通知(标题、消息、操作)；} 别的 {new BigPictureNotification(this,title,message,imageUrl,action);}}//[结束接收消息]

1.为什么会这样?

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

1. 显示消息:这些消息仅在您的应用处于前台
时触发onMessageReceived()回调
2. 数据消息:如果您的应用处于前台/后台/已终止

<块引用>

注意: Firebase 团队尚未开发用于发送 data-messages 的 UI你的设备，但是.您应该使用您的服务器发送此类型！

2.怎么做?

为此，您必须向以下 URL 执行 POST 请求:

<代码>{"to": "/topics/my_topic",数据": {"my_custom_key": "my_custom_value",my_custom_key2":真}}

<代码>{数据": {"my_custom_key": "my_custom_value",my_custom_key2":真},"registration_ids": ["{device-token}","{device2-token}","{device3-token}"]}

注意:确保您不添加 JSON 密钥通知
注意:要获取您的服务器密钥，您可以在 firebase 控制台中找到它:您的项目 ->设置->项目设置->云消息传递->服务器密钥

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公共无效 onMessageReceived(RemoteMessage remoteMessage) {映射<字符串，字符串>数据 = remoteMessage.getData();字符串 myCustomKey = data.get("my_custom_key");//管理数据}

Here is my manifest:

<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>

When the app is in the background and a notification arrives, then the default notification comes and doesn't run my code of onMessageReceived.

Here is my onMessageReceived code. This is invoked if my app is running on the foreground, not when it is running in the background. How can I run this code when the app is in background too?

// [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. Why is this happening?

There are two types of messages in FCM (Firebase Cloud Messaging):

1. Display Messages: These messages trigger the onMessageReceived() callback only when your app is in foreground
2. Data Messages: Theses messages trigger the onMessageReceived() callback even if your app is in foreground/background/killed

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. How to?

To achieve this, you have to perform a POST request to the following URL:

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

Headers

• Key: Content-Type, Value: application/json
• Key: Authorization, Value: key=<your-server-key>

Body using topics

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

Or if you want to send it to specific devices

{
    "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. How to handle the push notification message?

This is how you handle the received message:

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

     // Manage data
}

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