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Diffstat (limited to 'MusicDemo/src/main/java/com/example/android/musicservicedemo/utils/MediaIDHelper.java')
| -rw-r--r-- | MusicDemo/src/main/java/com/example/android/musicservicedemo/utils/MediaIDHelper.java | 88 |
1 files changed, 88 insertions, 0 deletions
diff --git a/MusicDemo/src/main/java/com/example/android/musicservicedemo/utils/MediaIDHelper.java b/MusicDemo/src/main/java/com/example/android/musicservicedemo/utils/MediaIDHelper.java new file mode 100644 index 0000000..2406886 --- /dev/null +++ b/MusicDemo/src/main/java/com/example/android/musicservicedemo/utils/MediaIDHelper.java @@ -0,0 +1,88 @@ +/* + * Copyright (C) 2014 Google Inc. All Rights Reserved. + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +package com.example.android.musicservicedemo.utils; + +import android.media.MediaMetadata; + +/** + * Utility class to help on queue related tasks. + */ +public class MediaIDHelper { + + private static final String TAG = "MediaIDHelper"; + + // Media IDs used on browseable items of MediaBrowser + public static final String MEDIA_ID_ROOT = "__ROOT__"; + public static final String MEDIA_ID_MUSICS_BY_GENRE = "__BY_GENRE__"; + + public static final String createTrackMediaID(String categoryType, String categoryValue, + MediaMetadata track) { + // MediaIDs are of the form <categoryType>/<categoryValue>|<musicUniqueId>, to make it easy to + // find the category (like genre) that a music was selected from, so we + // can correctly build the playing queue. This is specially useful when + // one music can appear in more than one list, like "by genre -> genre_1" + // and "by artist -> artist_1". + return categoryType + "/" + categoryValue + "|" + + track.getString(MediaMetadata.METADATA_KEY_MEDIA_ID); + } + + public static final String createBrowseCategoryMediaID(String categoryType, String categoryValue) { + return categoryType + "/" + categoryValue; + } + + /** + * Extracts unique musicID from the mediaID. mediaID is, by this sample's convention, a + * concatenation of category (eg "by_genre"), categoryValue (eg "Classical") and unique + * musicID. This is necessary so we know where the user selected the music from, when the music + * exists in more than one music list, and thus we are able to correctly build the playing queue. + * + * @param musicID + * @return + */ + public static final String extractMusicIDFromMediaID(String musicID) { + String[] segments = musicID.split("\\|", 2); + return segments.length == 2 ? segments[1] : null; + } + + /** + * Extracts category and categoryValue from the mediaID. mediaID is, by this sample's + * convention, a concatenation of category (eg "by_genre"), categoryValue (eg "Classical") and + * mediaID. This is necessary so we know where the user selected the music from, when the music + * exists in more than one music list, and thus we are able to correctly build the playing queue. + * + * @param mediaID + * @return + */ + public static final String[] extractBrowseCategoryFromMediaID(String mediaID) { + if (mediaID.indexOf('|') >= 0) { + mediaID = mediaID.split("\\|")[0]; + } + if (mediaID.indexOf('/') == 0) { + return new String[]{mediaID, null}; + } else { + return mediaID.split("/", 2); + } + } + + public static final String extractBrowseCategoryValueFromMediaID(String mediaID) { + String[] categoryAndValue = extractBrowseCategoryFromMediaID(mediaID); + if (categoryAndValue != null && categoryAndValue.length == 2) { + return categoryAndValue[1]; + } + return null; + } +}
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