Renato Mangini | c9063ac | 2014-09-04 12:21:05 -0300 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2014 Google Inc. All Rights Reserved. |
| 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.example.android.musicservicedemo.utils; |
| 18 | |
| 19 | import android.media.MediaMetadata; |
| 20 | import android.media.session.MediaSession; |
| 21 | |
| 22 | import com.example.android.musicservicedemo.model.MusicProvider; |
| 23 | |
| 24 | import java.util.ArrayList; |
| 25 | import java.util.Iterator; |
| 26 | import java.util.List; |
| 27 | |
| 28 | import static com.example.android.musicservicedemo.utils.MediaIDHelper.MEDIA_ID_MUSICS_BY_GENRE; |
| 29 | |
| 30 | /** |
| 31 | * Utility class to help on queue related tasks. |
| 32 | */ |
| 33 | public class QueueHelper { |
| 34 | |
| 35 | private static final String TAG = "QueueHelper"; |
| 36 | |
| 37 | public static final List<MediaSession.QueueItem> getPlayingQueue(String mediaId, |
| 38 | MusicProvider musicProvider) { |
| 39 | |
| 40 | // extract the category and unique music ID from the media ID: |
| 41 | String[] category = MediaIDHelper.extractBrowseCategoryFromMediaID(mediaId); |
| 42 | |
| 43 | // This sample only supports genre category. |
| 44 | if (!category[0].equals(MEDIA_ID_MUSICS_BY_GENRE) || category.length != 2) { |
| 45 | LogHelper.e(TAG, "Could not build a playing queue for this mediaId: ", mediaId); |
| 46 | return null; |
| 47 | } |
| 48 | |
| 49 | String categoryValue = category[1]; |
| 50 | LogHelper.e(TAG, "Creating playing queue for musics of genre ", categoryValue); |
| 51 | |
| 52 | List<MediaSession.QueueItem> queue = convertToQueue( |
| 53 | musicProvider.getMusicsByGenre(categoryValue)); |
| 54 | |
| 55 | return queue; |
| 56 | } |
| 57 | |
| 58 | public static final List<MediaSession.QueueItem> getPlayingQueueFromSearch(String query, |
| 59 | MusicProvider musicProvider) { |
| 60 | |
| 61 | LogHelper.e(TAG, "Creating playing queue for musics from search ", query); |
| 62 | |
| 63 | return convertToQueue(musicProvider.searchMusics(query)); |
| 64 | } |
| 65 | |
| 66 | |
| 67 | public static final int getMusicIndexOnQueue(Iterable<MediaSession.QueueItem> queue, |
| 68 | String mediaId) { |
| 69 | int index = 0; |
| 70 | for (MediaSession.QueueItem item: queue) { |
| 71 | if (mediaId.equals(item.getDescription().getMediaId())) { |
| 72 | return index; |
| 73 | } |
| 74 | index++; |
| 75 | } |
| 76 | return -1; |
| 77 | } |
| 78 | |
| 79 | public static final int getMusicIndexOnQueue(Iterable<MediaSession.QueueItem> queue, |
| 80 | long queueId) { |
| 81 | int index = 0; |
| 82 | for (MediaSession.QueueItem item: queue) { |
| 83 | if (queueId == item.getQueueId()) { |
| 84 | return index; |
| 85 | } |
| 86 | index++; |
| 87 | } |
| 88 | return -1; |
| 89 | } |
| 90 | |
| 91 | private static final List<MediaSession.QueueItem> convertToQueue( |
| 92 | Iterable<MediaMetadata> tracks) { |
| 93 | List<MediaSession.QueueItem> queue = new ArrayList<>(); |
| 94 | int count = 0; |
| 95 | for (MediaMetadata track : tracks) { |
| 96 | // We don't expect queues to change after created, so we use the item index as the |
| 97 | // queueId. Any other number unique in the queue would work. |
| 98 | MediaSession.QueueItem item = new MediaSession.QueueItem( |
| 99 | track.getDescription(), count++); |
| 100 | queue.add(item); |
| 101 | } |
| 102 | return queue; |
| 103 | |
| 104 | } |
| 105 | |
| 106 | /** |
| 107 | * Create a random queue. For simplicity sake, instead of a random queue, we create a |
| 108 | * queue using the first genre, |
| 109 | * |
| 110 | * @param musicProvider |
| 111 | * @return |
| 112 | */ |
| 113 | public static final List<MediaSession.QueueItem> getRandomQueue(MusicProvider musicProvider) { |
| 114 | Iterator<String> genres = musicProvider.getGenres().iterator(); |
| 115 | if (!genres.hasNext()) { |
| 116 | return new ArrayList<>(); |
| 117 | } |
| 118 | String genre = genres.next(); |
| 119 | Iterable<MediaMetadata> tracks = musicProvider.getMusicsByGenre(genre); |
| 120 | |
| 121 | return convertToQueue(tracks); |
| 122 | } |
| 123 | |
| 124 | |
| 125 | |
| 126 | public static final boolean isIndexPlayable(int index, List<MediaSession.QueueItem> queue) { |
| 127 | return (queue != null && index >= 0 && index < queue.size()); |
| 128 | } |
Nagesh Susarla | 372eb5f | 2014-11-07 16:18:29 -0800 | [diff] [blame] | 129 | } |