1 /*
2  * Copyright (C) 2016 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 package android.print.test.services;
18 
19 import android.app.Activity;
20 import android.os.Bundle;
21 
22 import java.util.ArrayList;
23 
24 public class InfoActivity extends Activity {
25     public interface Observer {
onCreate(Activity createdActivity)26         void onCreate(Activity createdActivity);
27     }
28 
29     private static final ArrayList<Observer> sObservers = new ArrayList<>();
30 
addObserver(Observer observer)31     public static void addObserver(Observer observer) {
32         synchronized (sObservers) {
33             sObservers.add(observer);
34         }
35     }
36 
clearObservers()37     public static void clearObservers() {
38         synchronized (sObservers) {
39             sObservers.clear();
40         }
41     }
42 
43     @Override
onCreate(Bundle savedInstanceState)44     protected void onCreate(Bundle savedInstanceState) {
45         super.onCreate(savedInstanceState);
46 
47         synchronized (sObservers) {
48             ArrayList<Observer> observers = (ArrayList<Observer>) sObservers.clone();
49 
50             for (Observer observer : observers) {
51                 observer.onCreate(this);
52             }
53         }
54     }
55 }
56