1 /*
2  * Copyright (C) 2020 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.window.sidecar;
18 
19 import android.content.Context;
20 import android.view.WindowManager;
21 
22 import androidx.annotation.Nullable;
23 
24 /**
25  * Provider class that will instantiate the library implementation. It must be included in the
26  * vendor library, and the vendor implementation must match the signature of this class.
27  */
28 public class SidecarProvider {
29 
30     private static volatile Boolean sIsWindowExtensionsEnabled;
31 
32     /**
33      * Provide a simple implementation of {@link SidecarInterface} that can be replaced by
34      * an OEM by overriding this method.
35      */
36     @Nullable
getSidecarImpl(Context context)37     public static SidecarInterface getSidecarImpl(Context context) {
38         return isWindowExtensionsEnabled()
39                 ? new SampleSidecarImpl(context.getApplicationContext())
40                 : null;
41     }
42 
43     /**
44      * The support library will use this method to check API version compatibility.
45      * @return API version string in MAJOR.MINOR.PATCH-description format.
46      */
47     @Nullable
getApiVersion()48     public static String getApiVersion() {
49         return isWindowExtensionsEnabled()
50                 ? "1.0.0-reference"
51                 : null;
52     }
53 
isWindowExtensionsEnabled()54     private static boolean isWindowExtensionsEnabled() {
55         if (sIsWindowExtensionsEnabled == null) {
56             synchronized (SidecarProvider.class) {
57                 if (sIsWindowExtensionsEnabled == null) {
58                     sIsWindowExtensionsEnabled = WindowManager.hasWindowExtensionsEnabled();
59                 }
60             }
61         }
62         return sIsWindowExtensionsEnabled;
63     }
64 }
65