Android推送通知setLargeIcon无法正常工作，并且图标未显示FCM

Question

我正在通过if语句检查大于android Lolipop版本的Build.VERSION，以确保图标可以出现在通知的右侧。

我用过

  

setLargeIcon（）

，但通知上没有任何图标或图像显示。为什么？

下面是我的代码：

    String senderImage = "https://cdn.iconscout.com/icon/premium/png-256-thumb/tom-757419.png";
    Bitmap bitmap = getBitmapFromURL(senderImage);
    Uri defaultSoundUri= RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);

    NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(this, id);
    if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            notificationBuilder.setAutoCancel(true)   //Automatically delete the notification
                    .setLargeIcon(bitmap)
                    .setChannelId(id)
                    .setSmallIcon(R.mipmap.ic_app)
                    .setContentIntent(pendingIntent)
                    .setContentTitle(notificationTitle)
                    .setContentText(notificationBody)
                    .setSound(defaultSoundUri);
    } else {
        notificationBuilder.setAutoCancel(true)   //Automatically delete the notification
                .setChannelId(id)
                .setSmallIcon(R.mipmap.ic_app)
                .setContentIntent(pendingIntent)
                .setContentTitle(notificationTitle)
                .setContentText(notificationBody)
                .setSound(defaultSoundUri);
    }


    NotificationManager notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);

    if (notificationManager != null) {
        notificationManager.notify(1, notificationBuilder.build());
    }

该函数将url转换为位图，如下所示：

    public Bitmap getBitmapFromURL(String strURL) {
    try {
        URL url = new URL(strURL);
        HttpURLConnection connection = (HttpURLConnection) url.openConnection();
        connection.setDoInput(true);
        connection.connect();
        InputStream input = connection.getInputStream();
        return BitmapFactory.decodeStream(input);
    } catch (IOException e) {
        e.printStackTrace();
        return null;
    }
}