android 通知 Notification

private void showNotification2(Context context, int iid, String title, String text) {    String id = "my_channel_01";    String name = "我是渠道名字";    NotificationManager notificationManager = (NotificationManager) MyApplication.mContext.getSystemService(NOTIFICATION_SERVICE);    Notification notification = null;    Toast.makeText(this, "qweqweqwewqewq", Toast.LENGTH_SHORT).show();    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {        NotificationChannel mChannel = new NotificationChannel(id, name, NotificationManager.IMPORTANCE_LOW);        Log.i("log", mChannel.toString());        notificationManager.createNotificationChannel(mChannel);        notification = new Notification.Builder(this)                .setChannelId(id)                .setContentTitle("5 new messages")                .setContentText("hahaha")                .setSmallIcon(R.mipmap.ic_launcher).build();    } else {        NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(MyApplication.mContext)                .setContentTitle("5 new messages")                .setContentText("hahaha")                .setSmallIcon(R.mipmap.ic_launcher)                .setOngoing(true)                .setChannel(id);//无效        notification = notificationBuilder.build();    }    notificationManager.notify(iid, notification);}
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