1 /* 2 * Copyright (C) 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 android.car.media; 18 19 import android.annotation.NonNull; 20 import android.annotation.SystemApi; 21 import android.car.annotation.ApiRequirements; 22 23 import java.util.List; 24 25 /** 26 * Interface to listen to events impacting volume groups. 27 * 28 * @hide 29 */ 30 @SystemApi 31 @ApiRequirements(minCarVersion = ApiRequirements.CarVersion.UPSIDE_DOWN_CAKE_0, 32 minPlatformVersion = ApiRequirements.PlatformVersion.UPSIDE_DOWN_CAKE_0) 33 public interface CarVolumeGroupEventCallback { 34 /** 35 * This is called when audio framework acts on events that causes changes to 36 * {@link android.car.media.CarVolumeGroupInfo}. 37 * The callback includes a list of {@link android.car.media.CarVolumeGroupEvent}. 38 * Each event contains event-types (what has changed), list of volume group infos 39 * and additional information (why it has changed). 40 */ 41 @ApiRequirements(minCarVersion = ApiRequirements.CarVersion.UPSIDE_DOWN_CAKE_0, 42 minPlatformVersion = ApiRequirements.PlatformVersion.UPSIDE_DOWN_CAKE_0) onVolumeGroupEvent(@onNull List<CarVolumeGroupEvent> volumeGroupEvents)43 void onVolumeGroupEvent(@NonNull List<CarVolumeGroupEvent> volumeGroupEvents); 44 } 45