图片未显示在推送通知中

Question

我正在使用下面的通知有效负载并使用 Postman 向 Android 设备发送推送通知：

{
    "to" : "/topics/xxxx" ,
    "data" : {
        "url" : "https://res.cloudinary.com/demo/image/upload/w_200/lady.jpg",
        "dl" : ""
    },
    "notification" : {
        "title" : "This is a sample notification from general2",
        "body" : "Rich notification testing (body)",
        "image": "https://res.cloudinary.com/demo/image/upload/w_200/lady.jpg"
    }

}

我已使用image键值对在推送通知中包含图像。我的预期输出是：

但这就是手机中显示的内容：

如您所见，图像没有出现。可能是什么问题？

Answer 1

我发现问题出在激进的电池保护器上。例如，小米和三星（尤其是Android 11）手机将限制FCM进行后台联网（获取图像），因此图像将会丢失。仅当手机处于深度睡眠状态时才会发生这种情况。如果不是（并且您的应用程序已关闭或在后台），则会显示图像。如果应用程序在前台，onMessageReceived()则会被调用，您无论如何都需要手动获取图像，并且不会受到手机的限制。

遗憾的是，除了用户手动禁用应用程序的省电功能之外，我没有找到任何解决方法：/

Answer 2

这段代码可能有帮助

public class MyFirebaseMessagingService extends FirebaseMessagingService {

    private static final String TAG = "MyFirebaseMessagingServ";

    Target target = new Target() {
        @Override
        public void onBitmapLoaded(Bitmap bitmap, Picasso.LoadedFrom from) {
            sendNotification(bitmap);
        }

        @Override
        public void onBitmapFailed(Exception e, Drawable errorDrawable) {

        }

        @Override
        public void onPrepareLoad(Drawable placeHolderDrawable) {

        }
    };

    @Override
    public void onMessageReceived(RemoteMessage remoteMessage) {
        super.onMessageReceived(remoteMessage);

        if(remoteMessage.getData()!=null)
            getImage(remoteMessage);
    }

    private void sendNotification(Bitmap bitmap){


        NotificationCompat.BigPictureStyle style = new NotificationCompat.BigPictureStyle();
        style.bigPicture(bitmap);

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

        Intent intent = new Intent(getApplicationContext(), MainActivity.class);
        intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_SINGLE_TOP);
        PendingIntent pendingIntent = PendingIntent.getActivity(getApplicationContext(), 0, intent,0);

        NotificationManager notificationManager = (NotificationManager)getSystemService(Context.NOTIFICATION_SERVICE);
        String NOTIFICATION_CHANNEL_ID = "101";

        if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.O){
            @SuppressLint("WrongConstant") NotificationChannel notificationChannel = new NotificationChannel(NOTIFICATION_CHANNEL_ID, "Notification", NotificationManager.IMPORTANCE_MAX);

            //Configure Notification Channel
            notificationChannel.setDescription("Game Notifications");
            notificationChannel.enableLights(true);
            notificationChannel.setVibrationPattern(new long[]{0, 1000, 500, 1000});
            notificationChannel.enableVibration(true);

            notificationManager.createNotificationChannel(notificationChannel);
        }

        NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(this, NOTIFICATION_CHANNEL_ID)
                .setSmallIcon(R.mipmap.ic_launcher_round)
                .setContentTitle(Config.title)
                .setAutoCancel(true)
                .setSound(defaultSound)
                .setContentText(Config.content)
                .setContentIntent(pendingIntent)
                .setStyle(style)
                .setLargeIcon(bitmap)
                .setWhen(System.currentTimeMillis())
                .setPriority(Notification.PRIORITY_MAX);


        notificationManager.notify(1, notificationBuilder.build());


    }

    private void getImage(final RemoteMessage remoteMessage) {

        Map<String, String> data = remoteMessage.getData();
        Config.title = data.get("title");
        Config.content = data.get("content");
        Config.imageUrl = data.get("imageUrl");
        Config.gameUrl = data.get("gameUrl");
        //Create thread to fetch image from notification
        if(remoteMessage.getData()!=null){

            Handler uiHandler = new Handler(Looper.getMainLooper());
            uiHandler.post(new Runnable() {
                @Override
                public void run() {
                    // Get image from data Notification
                    Picasso.get()
                            .load(Config.imageUrl)
                            .into(target);
                }
            }) ;
        }
    }
}