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      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 androidx.appcompat.app;
     18 
     19 import androidx.appcompat.test.R;
     20 import androidx.appcompat.testutils.BaseTestActivity;
     21 
     22 public class NightModeActivity extends BaseTestActivity {
     23 
     24     /**
     25      * Warning, gross hack here. Since night mode uses recreate(), we need a way to be able to
     26      * grab the top activity. The test runner only keeps reference to the original Activity which
     27      * is no good for these tests. Fixed by keeping a static reference to the 'top' instance, and
     28      * updating it in onResume and onPause. I said it was gross.
     29      */
     30     static NightModeActivity TOP_ACTIVITY = null;
     31 
     32     @Override
     33     protected int getContentViewLayoutResId() {
     34         return R.layout.activity_night_mode;
     35     }
     36 
     37     @Override
     38     protected void onResume() {
     39         super.onResume();
     40         TOP_ACTIVITY = this;
     41     }
     42 
     43     @Override
     44     protected void onPause() {
     45         super.onPause();
     46         if (TOP_ACTIVITY == this) {
     47             TOP_ACTIVITY = null;
     48         }
     49     }
     50 }
     51