1 /*
2  * Copyright 2023 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 androidx.camera.testing.impl.activity;
18 
19 import android.app.Activity;
20 import android.os.Bundle;
21 
22 import androidx.test.espresso.idling.CountingIdlingResource;
23 
24 import org.jspecify.annotations.NonNull;
25 import org.jspecify.annotations.Nullable;
26 
27 /** An empty activity that checks the activity's <em>main</em> window currently has window focus. */
28 public class ForegroundTestActivity extends Activity {
29 
30     final CountingIdlingResource mViewReady = new CountingIdlingResource("ViewReady");
31 
getViewReadyIdlingResource()32     public @NonNull CountingIdlingResource getViewReadyIdlingResource() {
33         return mViewReady;
34     }
35 
36     @Override
onCreate(@ullable Bundle savedInstanceState)37     protected void onCreate(@Nullable Bundle savedInstanceState) {
38         super.onCreate(savedInstanceState);
39         mViewReady.increment();
40     }
41 
42     @Override
onWindowFocusChanged(boolean hasFocus)43     public void onWindowFocusChanged(boolean hasFocus) {
44         super.onWindowFocusChanged(hasFocus);
45         if (hasFocus && !mViewReady.isIdleNow()) {
46             mViewReady.decrement();
47         }
48     }
49 }
50