Firebase可扩展通知在应用处于后台时显示图像

Question

我正在Android中实施FCM通知，但通知根据应用程序状态（后台与前台）有何不同？

我使用带有邮递员的FCM API发送通知，以下是通知结构：

{ "notification": {
      "title": "Notification title",
      "body": "Notification message",
      "sound": "default",
      "color": "#53c4bc",
      "click_action": "MY_BOOK",
      "icon": "ic_launcher"
   },
   "data": {
       "main_picture": "URL_OF_THE_IMAGE"  
   },
   "to" : "USER_FCM_TOKEN"
}

要渲染的图像取自data.main_picture。

我已经实现了我自己的Firebase MessagingService，它使通知在前台状态下完美显示。通知代码是下一个：

NotificationCompat.BigPictureStyle notiStyle = new NotificationCompat.BigPictureStyle();
notiStyle.setSummaryText(messageBody);
notiStyle.bigPicture(picture);

Uri defaultSoundUri= RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);

NotificationCompat.Builder notificationBuilder = (NotificationCompat.Builder) new NotificationCompat.Builder(this)
            .setSmallIcon(R.drawable.ic_launcher)
            .setLargeIcon(bigIcon)
            .setContentTitle(title)
            .setContentText(messageBody)
            .setAutoCancel(true)
            .setSound(defaultSoundUri)
            .setContentIntent(pendingIntent)
            .setStyle(notiStyle); code here

NotificationManager notificationManager =
            (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
notificationManager.notify(0, notificationBuilder.build());

然而，在后台，该服务甚至没有被执行。在AndroidManifest中。xml，Firebase服务声明如下：

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

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

我的问题不是大图标或小图标，而是显示大画面。

谢谢你的支持。

Answer 1

如果2019年有人在这里登陆，您只需向通知对象添加一个图像字段：

    {
        notification: {
            title: title,
            body: body,
            image: "http://path_to_image"
        },
        data: {
            click_action: "FLUTTER_NOTIFICATION_CLICK",
            your_data: ...,
        },
        token: token
    }

我已经在Android上使用Flatter对其进行了测试，我认为它可以在原生Android上运行，因为它们可能都使用相同的原生SDK。

Answer 2

查看我的FirebaseMessagingService

public class MyFirebaseMessagingService extends FirebaseMessagingService {
 
    private static final String TAG = "FirebaseMessageService";
    Bitmap bitmap;
 
    /**
     * Called when message is received.
     *
     * @param remoteMessage Object representing the message received from Firebase Cloud Messaging.
     */
    @Override
    public void onMessageReceived(RemoteMessage remoteMessage) {
        // 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
        //
        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());
        }
 
        //The message which i send will have keys named [message, image, AnotherActivity] and corresponding values.
        //You can change as per the requirement.
        
        //message will contain the Push Message
        String message = remoteMessage.getData().get("message");
        //imageUri will contain URL of the image to be displayed with Notification
        String imageUri = remoteMessage.getData().get("image");
        //If the key AnotherActivity has  value as True then when the user taps on notification, in the app AnotherActivity will be opened. 
        //If the key AnotherActivity has  value as False then when the user taps on notification, in the app MainActivity will be opened. 
        String TrueOrFlase = remoteMessage.getData().get("AnotherActivity");
 
        //To get a Bitmap image from the URL received
        bitmap = getBitmapfromUrl(imageUri);
 
        sendNotification(message, bitmap, TrueOrFlase);
 
    }
 
 
    /**
     * Create and show a simple notification containing the received FCM message.
     */
 
    private void sendNotification(String messageBody, Bitmap image, String TrueOrFalse) {
        Intent intent = new Intent(this, MainActivity.class);
        intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
        intent.putExtra("AnotherActivity", TrueOrFalse);
        PendingIntent pendingIntent = PendingIntent.getActivity(this, 0 /* Request code */, intent,
                PendingIntent.FLAG_ONE_SHOT);
 
        Uri defaultSoundUri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
        NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(this)
                .setLargeIcon(image)/*Notification icon image*/
                .setSmallIcon(R.drawable.firebase_icon)
                .setContentTitle(messageBody)
                .setStyle(new NotificationCompat.BigPictureStyle()
                        .bigPicture(image))/*Notification with Image*/
                .setAutoCancel(true)
                .setSound(defaultSoundUri)
                .setContentIntent(pendingIntent);
 
        NotificationManager notificationManager =
                (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
 
        notificationManager.notify(0 /* ID of notification */, notificationBuilder.build());
    }
 
    /*
    *To get a Bitmap image from the URL received
    * */
    public Bitmap getBitmapfromUrl(String imageUrl) {
        try {
            URL url = new URL(imageUrl);
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();
            connection.setDoInput(true);
            connection.connect();
            InputStream input = connection.getInputStream();
            Bitmap bitmap = BitmapFactory.decodeStream(input);
            return bitmap;
 
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            return null;
 
        }
    }
}

Answer 3

FCM通知消息不支持largeIcon或bigPicture。

如果您在后台需要它们，可以使用FCM数据消息。

对于数据消息，总是调用onMessageReceived（message）方法，因此可以使用消息。getData（）方法并创建自定义通知。

在此处阅读有关通知消息与数据消息的更多信息：https://firebase.google.com/docs/cloud-messaging/concept-options#notifications_and_data_messages