1 /*
2  * Copyright (C) 2017 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file
5  * except in compliance with the License. You may obtain a copy of the License at
6  *
7  *      http://www.apache.org/licenses/LICENSE-2.0
8  *
9  * Unless required by applicable law or agreed to in writing, software distributed under the
10  * License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
11  * KIND, either express or implied. See the License for the specific language governing
12  * permissions and limitations under the License.
13  */
14 
15 package android.testing;
16 
17 import android.content.pm.ApplicationInfo;
18 import android.graphics.PixelFormat;
19 import android.support.test.InstrumentationRegistry;
20 import android.view.View;
21 import android.view.WindowManager;
22 import android.view.WindowManager.LayoutParams;
23 
24 /**
25  * Utilities to make testing views easier.
26  */
27 public class ViewUtils {
28 
29     /**
30      * Causes the view (and its children) to have {@link View#onAttachedToWindow()} called.
31      *
32      * This is currently done by adding the view to a window.
33      */
attachView(View view)34     public static void attachView(View view) {
35         // Make sure hardware acceleration isn't turned on.
36         view.getContext().getApplicationInfo().flags &=
37                 ~(ApplicationInfo.FLAG_HARDWARE_ACCELERATED);
38         WindowManager.LayoutParams lp = new WindowManager.LayoutParams(
39                 LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT,
40                 LayoutParams.TYPE_APPLICATION_OVERLAY,
41                 0, PixelFormat.TRANSLUCENT);
42         view.getContext().getSystemService(WindowManager.class).addView(view, lp);
43     }
44 
45     /**
46      * Causes the view (and its children) to have {@link View#onDetachedFromWindow()} called.
47      *
48      * This is currently done by removing the view from a window.
49      */
detachView(View view)50     public static void detachView(View view) {
51         view.getContext().getSystemService(WindowManager.class).removeViewImmediate(view);
52     }
53 }
54