Android Q 使用通知栏消息

String myChannelId = "iot";                String myChannelName = "告警通知服务";                NotificationManager manager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);                Notification notification = null;                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {                    NotificationChannel channel = new NotificationChannel(myChannelId, myChannelName,                            NotificationManager.IMPORTANCE_LOW);                    Toast.makeText(this, myChannelId, Toast.LENGTH_SHORT).show();                    manager.createNotificationChannel(channel);                    notification = new NotificationCompat.Builder(this, myChannelId)                            .setContentTitle("测试")                            .setContentText("一个新消息")                            .setWhen(System.currentTimeMillis())                            .setShowWhen(true)                            .setSmallIcon(R.mipmap.ic_launcher)                            .setLargeIcon(BitmapFactory.decodeResource(getResources(),R.mipmap.ic_launcher))                            .build();                }else {                    notification = new NotificationCompat.Builder(this, myChannelId)                            .setContentTitle("This is a title")                            .setContentText("This is a context")                            .setWhen(System.currentTimeMillis())                            .setSmallIcon(R.mipmap.ic_launcher)                            .setLargeIcon(BitmapFactory.decodeResource(getResources(), R.mipmap.ic_launcher))                            .build();                }                manager.notify(1, notification);
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