1 /*
2  * Copyright (C) 2017 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 package android.app;
17 
18 import android.annotation.SystemApi;
19 
20 /**
21  * Listens to VR Mode state changes. Use with methods in {@link VrManager}.
22  *
23  * @hide
24  */
25 @SystemApi
26 public abstract class VrStateCallback {
27 
28     /**
29      * Callback triggered when there is a change to Persistent VR State.
30      *
31      * @param enabled True when VR State is in persistent mode, false otherwise.
32      */
onPersistentVrStateChanged(boolean enabled)33     public void onPersistentVrStateChanged(boolean enabled) {}
34 
35     /**
36      * Callback triggered when there is a change to Vr State.
37      *
38      * @param enabled True when VR State is in VR mode, false otherwise.
39      */
onVrStateChanged(boolean enabled)40     public void onVrStateChanged(boolean enabled) {}
41 }
42