1<?xml version="1.0" encoding="UTF-8"?> 2<!-- 3 Copyright 2013 The Android Open Source Project 4 5 Licensed under the Apache License, Version 2.0 (the "License"); 6 you may not use this file except in compliance with the License. 7 You may obtain a copy of the License at 8 9 http://www.apache.org/licenses/LICENSE-2.0 10 11 Unless required by applicable law or agreed to in writing, software 12 distributed under the License is distributed on an "AS IS" BASIS, 13 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 See the License for the specific language governing permissions and 15 limitations under the License. 16--> 17<sample> 18 <name>MediaBrowserService</name> 19 <group>Media</group> 20 <package>com.example.android.mediabrowserservice</package> 21 22 <minSdk>21</minSdk> 23 24 <strings> 25 <intro> 26 <![CDATA[ 27This sample shows how to implement an audio media app that provides 28media library metadata and playback controls through a standard 29service. It exposes a simple music library through the new 30MediaBrowserService and provides MediaSession callbacks. This allows 31it to be used in Android Auto, for example. 32When not connected to a car, the app has a very simple UI that browses 33the media library and provides simple playback controls. When 34connected to Android Auto, the same service provides data and callback 35to the Android Auto UI in the same manner as it provides them to the 36local UI. 37]]></intro> 38 </strings> 39 40 <!-- The basic templates have already been enabled. Uncomment more as desired. --> 41 <template src="base-build" /> 42 <template src="base-application" /> 43 <metadata> 44 <status>PUBLISHED</status> 45 <categories>Media</categories> 46 <technologies>Android</technologies> 47 <languages>Java</languages> 48 <solutions>Mobile</solutions> 49 <level>ADVANCED</level> 50 <icon>screenshots/icon-web.png</icon> 51 <screenshots> 52 <img>screenshots/1-main.png</img> 53 <img>screenshots/2-music-play.png</img> 54 <img>screenshots/3-music-notification.png</img> 55 </screenshots> 56 <api_refs> 57 <android>android.service.media.MediaBrowserService</android> 58 <android>android.media.browse.MediaBrowser</android> 59 <android>android.media.session.MediaSession</android> 60 <android>android.media.session.MediaController</android> 61 <android>android.app.Notification.MediaStyle</android> 62 </api_refs> 63 <description> 64<![CDATA[ 65This sample shows how to implement an audio media app that provides 66media library metadata and playback controls through a standard 67service. It exposes a simple music library through the new 68MediaBrowserService and provides MediaSession callbacks. This allows 69it to be used in Android Auto, for example. 70When not connected to a car, the app has a very simple UI that browses 71the media library and provides simple playback controls. When 72connected to Android Auto, the same service provides data and callback 73to the Android Auto UI in the same manner as it provides them to the 74local UI. 75]]></description> 76 <intro> 77<![CDATA[ 78To implement a MediaBrowserService, you need to: 79 80- Extend android.service.media.MediaBrowserService, implementing the media 81 browsing related methods onGetRoot and onLoadChildren; 82 83- In onCreate, start a new MediaSession and call super.setSessionToken() with 84 this MediaSession's token; 85 86- Set a MediaSession.Callback class on the MediaSession. The callback class 87 will receive all the user's actions, like play, pause, etc; 88 89- Handle all the actual music playing using any method your app prefers 90 (for example, the Android MediaPlayer class) 91 92- Whenever it changes, update info about the playing item and the playing 93 queue using MediaSession corresponding methods (setMetadata, 94 setPlaybackState, setQueue, setQueueTitle, etc) 95 96- Handle AudioManager focus change events and react appropriately 97 (e.g. pause when audio focus is lost) 98 99 100To make it compatible with Android Auto, you also need to: 101 102- Declare a meta-data tag in AndroidManifest.xml linking to a xml resource 103 with a automotiveApp root element. For a media app, this must include 104 an <uses name="media"/> element as a child. 105 106 For example, in AndroidManifest.xml: 107``` 108 <meta-data android:name="com.google.android.gms.car.application" 109 android:resource="@xml/automotive_app_desc"/> 110``` 111 112 And in res/xml/automotive\_app\_desc.xml: 113``` 114 <?xml version="1.0" encoding="utf-8"?> 115 <automotiveApp> 116 <uses name="media"/> 117 </automotiveApp> 118``` 119 120- Declare and export the service in AndroidManifest.xml: 121``` 122 <service 123 android:name=".service.MusicService" 124 android:exported="true"> 125 <intent-filter> 126 <action android:name="android.media.browse.MediaBrowserService" /> 127 </intent-filter> 128 </service> 129``` 130]]></intro> 131 </metadata> 132</sample> 133
