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[ 27 This sample shows how to implement an audio media app that provides 28 media library metadata and playback controls through a standard 29 service. It exposes a simple music library through the new 30 MediaBrowserService and provides MediaSession callbacks. This allows 31 it to be used in Android Auto, for example. 32 When not connected to a car, the app has a very simple UI that browses 33 the media library and provides simple playback controls. When 34 connected to Android Auto, the same service provides data and callback 35 to the Android Auto UI in the same manner as it provides them to the 36 local UI. 37 ]]></intro> 38 </strings> 39 40 <!-- The basic templates have already been enabled. Uncomment more as desired. --> 41 <template src="basebuild" /> 42 <metadata> 43 <status>PUBLISHED</status> 44 <categories>Media</categories> 45 <technologies>Android</technologies> 46 <languages>Java</languages> 47 <solutions>Mobile</solutions> 48 <level>ADVANCED</level> 49 <icon>screenshots/icon-web.png</icon> 50 <screenshots> 51 <img>screenshots/1-main.png</img> 52 <img>screenshots/2-music-play.png</img> 53 <img>screenshots/3-music-notification.png</img> 54 </screenshots> 55 <api_refs> 56 <android>android.service.media.MediaBrowserService</android> 57 <android>android.media.browse.MediaBrowser</android> 58 <android>android.media.session.MediaSession</android> 59 <android>android.media.session.MediaController</android> 60 <android>android.app.Notification.MediaStyle</android> 61 </api_refs> 62 <description> 63 <![CDATA[ 64 This sample shows how to implement an audio media app that provides 65 media library metadata and playback controls through a standard 66 service. It exposes a simple music library through the new 67 MediaBrowserService and provides MediaSession callbacks. This allows 68 it to be used in Android Auto, for example. 69 When not connected to a car, the app has a very simple UI that browses 70 the media library and provides simple playback controls. When 71 connected to Android Auto, the same service provides data and callback 72 to the Android Auto UI in the same manner as it provides them to the 73 local UI. 74 ]]></description> 75 <intro> 76 <![CDATA[ 77 To implement a MediaBrowserService, you need to: 78 79 - Extend android.service.media.MediaBrowserService, implementing the media 80 browsing related methods onGetRoot and onLoadChildren; 81 82 - In onCreate, start a new MediaSession and call super.setSessionToken() with 83 this MediaSession's token; 84 85 - Set a MediaSession.Callback class on the MediaSession. The callback class 86 will receive all the user's actions, like play, pause, etc; 87 88 - Handle all the actual music playing using any method your app prefers 89 (for example, the Android MediaPlayer class) 90 91 - Whenever it changes, update info about the playing item and the playing 92 queue using MediaSession corresponding methods (setMetadata, 93 setPlaybackState, setQueue, setQueueTitle, etc) 94 95 - Handle AudioManager focus change events and react appropriately 96 (e.g. pause when audio focus is lost) 97 98 99 To make it compatible with Android Auto, you also need to: 100 101 - Declare a meta-data tag in AndroidManifest.xml linking to a xml resource 102 with a automotiveApp root element. For a media app, this must include 103 an <uses name="media"/> element as a child. 104 105 For example, in AndroidManifest.xml: 106 ``` 107 <meta-data android:name="com.google.android.gms.car.application" 108 android:resource="@xml/automotive_app_desc"/> 109 ``` 110 111 And in res/xml/automotive\_app\_desc.xml: 112 ``` 113 <?xml version="1.0" encoding="utf-8"?> 114 <automotiveApp> 115 <uses name="media"/> 116 </automotiveApp> 117 ``` 118 119 - Declare and export the service in AndroidManifest.xml: 120 ``` 121 <service 122 android:name=".service.MusicService" 123 android:exported="true"> 124 <intent-filter> 125 <action android:name="android.media.browse.MediaBrowserService" /> 126 </intent-filter> 127 </service> 128 ``` 129 ]]></intro> 130 </metadata> 131 </sample> 132
