title: Scheduling notifications for the future in Oreo
body: <p>I'm using Android Oreo's new notification system. I want to schedule a notification in the future. I made a test program that is supposed to fire a notification 5 seconds later. Instead, it displays the notification immediately. Here is my code:</p>
  
  <pre><code>public class MainActivity extends AppCompatActivity {
      private NotificationManager manager;
  
      @Override
      protected void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.activity_main);
  
          NotificationChannel notificationChannel = new NotificationChannel("default",
                  "primary", NotificationManager.IMPORTANCE_DEFAULT);
          manager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
          manager.createNotificationChannel(notificationChannel);
  
          Button button = (Button) findViewById(R.id.button);
          button.setOnClickListener(new View.OnClickListener() {
              @Override
              public void onClick(View v) {
                  Notification notification = new Notification.Builder(getApplicationContext(), "default")
                          .setContentTitle("title")
                          .setContentText("body")
                          .setWhen(Calendar.getInstance().getTimeInMillis() + 5000)
                          .setSmallIcon(android.R.drawable.stat_notify_chat)
                          .setAutoCancel(true)
                          .build();
                  manager.notify(123, notification);
              }
          });
      }
  }
  </code></pre>
  
  <p>Thanks!</p>