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 com.android.car.stream; 18 19 /** 20 * A class that holds various common constants used through the Stream service. 21 */ 22 public class StreamServiceConstants { 23 /** 24 * The id that should be used for all media cards. Using a common id for all media cards 25 * ensure that only one will show at a time. 26 */ 27 public static long MEDIA_CARD_ID = -1L; 28 29 /** 30 * The id within the {@link MediaPlaybackExtension} that indicates this MediaPlaybackExtension 31 * is coming from a non-radio application. 32 * 33 * <p>The reason that this id is necessary is because the radio does not use the MediaSession 34 * to notify of playback state. Thus, notifications about playback state for media apps and 35 * radio are not guaranteed to be in order. This id along with {@link #MEDIA_EXTENSION_ID_RADIO} 36 * will help differentiate which application is firing a change. 37 */ 38 public static long MEDIA_EXTENSION_ID_NON_RADIO = -1L; 39 40 /** 41 * The id within the {@link MediaPlaybackExtension} that indicates this MediaPlaybackExtension 42 * is coming from a radio application. 43 * 44 * @see {@link #MEDIA_EXTENSION_ID_NON_RADIO} 45 */ 46 public static long MEDIA_EXTENSION_ID_RADIO= -2L; 47 48 StreamServiceConstants()49 private StreamServiceConstants() {} 50 } 51