友盟推送android 8.0系统不显示推送消息问题

android各版本对应的api情况，而android8.0以及之后的版本，notifycation为了更安全，又增加了channel的写法，代码如下

if (Build.VERSION.SDK_INT >= 26) {                    NotificationManager manager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);                    NotificationChannel channel = new NotificationChannel("channel_id", "channel_name", NotificationManager.IMPORTANCE_HIGH);                    if (manager != null) {                        manager.createNotificationChannel(channel);                    }                    Notification.Builder builder = new Notification.Builder(context, "channel_id");                     builder.setSmallIcon(R.mipmap.ic_launcher)                            .setWhen(System.currentTimeMillis())                            .setLargeIcon(BitmapFactory.decodeResource(context.getResources(), R.mipmap.ic_launcher))                            .setContentTitle(msg.title)                            .setContentText(msg.text)                            .setAutoCancel(true);                    return builder.build();                } else {                    Notification.Builder builder = new Notification.Builder(context);                    builder.setSmallIcon(R.mipmap.ic_launcher)                            .setWhen(System.currentTimeMillis())                            .setLargeIcon(BitmapFactory.decodeResource(context.getResources(), R.mipmap.ic_launcher))                            .setContentTitle(msg.title)                            .setContentText(msg.text)                            .setAutoCancel(true);                    return builder.build();                }

这样就完美解决能收到推送消息，但是通知栏不显示的问题

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