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android通知

在sdk版本为25或25之前通知方法有变，《android第一行代码》代码跑不通，修改如下

    public void onClick(View view)
    {
                String description = "text";
                int important = NotificationManager.IMPORTANCE_LOW;
                if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O)
                {
                    NotificationChannel notificationChannel = new NotificationChannel("001",description,important);
                    NotificationManager manager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
                    manager.createNotificationChannel(notificationChannel);
                    Notification notification = new NotificationCompat.Builder(this,"001")
                            .setContentTitle(" title")
                            .setContentText("content text")
                            .setWhen(System.currentTimeMillis())
                            .setSmallIcon(R.mipmap.ic_launcher)
                            .setLargeIcon(BitmapFactory.decodeResource(getResources(),R.mipmap.ic_launcher))
                            .build();
                    manager.notify(1,notification);
                }
                else
                {
                    NotificationManager manager = (NotificationManager)getSystemService(NOTIFICATION_SERVICE);
                    Notification notification = new NotificationCompat.Builder(MainActivity.this)
                            .setContentTitle(" title")
                            .setContentText("content text")
                            .setSmallIcon(R.mipmap.ic_launcher)
                            .build();
                    manager.notify(1,notification);
                }
    }