通知生成器不能接受“this”作为“context”的替代,为什么?

我该如何解决这个问题?如果我将其替换为 this 。它在生成器上创建了更多错误。我该如何解决?

java类中的所有代码。在这种情况下,功能围绕 onStartCommand .

 public class MyNotificationService extends Service {

    @Override
    public IBinder onBind(Intent arg0) {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public void onCreate() {
        // TODO Auto-generated method stub
        super.onCreate();
        Toast.makeText(this, "OnCreate()", Toast.LENGTH_SHORT).show();
    }

    @Override
    public void onDestroy() {
        // TODO Auto-generated method stub
        super.onDestroy();
        Toast.makeText(this, "OnDestroy()", Toast.LENGTH_SHORT).show();
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        // TODO Auto-generated method stub
        Toast.makeText(this, "OnStartCommand()", Toast.LENGTH_SHORT).show();
        NotificationManager notificationmanager = (NotificationManager)getSystemService(Context.NOTIFICATION_SERVICE);
        Intent notificationintent = new Intent(this, Reminder_2.class);
        PendingIntent pendingintent = PendingIntent.getActivity(this, 0, notificationintent, 0);
        int icon=R.drawable.ic_launcher;
        long when=System.currentTimeMillis();
        Notification.Builder builder = new Builder(this);
        builder.setContentIntent(pendingintent);
        builder.setAutoCancel(true);
        builder.setSmallIcon(icon);
        builder.setWhen(when);
        builder.setTicker("Notification");
        builder.setContentTitle("Title");
        builder.setContentText("Content");
        Notification notification = builder.build();
        notificationmanager.notify(033, notification);
        return super.onStartCommand(intent, flags, startId);
    }


}