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/*
* 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;
import android.media.session.MediaSession;
import com.example.android.musicservicedemo.model.MusicProvider;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import static com.example.android.musicservicedemo.utils.MediaIDHelper.MEDIA_ID_MUSICS_BY_GENRE;
/**
* Utility class to help on queue related tasks.
*/
public class QueueHelper {
private static final String TAG = "QueueHelper";
public static final List<MediaSession.QueueItem> getPlayingQueue(String mediaId,
MusicProvider musicProvider) {
// extract the category and unique music ID from the media ID:
String[] category = MediaIDHelper.extractBrowseCategoryFromMediaID(mediaId);
// This sample only supports genre category.
if (!category[0].equals(MEDIA_ID_MUSICS_BY_GENRE) || category.length != 2) {
LogHelper.e(TAG, "Could not build a playing queue for this mediaId: ", mediaId);
return null;
}
String categoryValue = category[1];
LogHelper.e(TAG, "Creating playing queue for musics of genre ", categoryValue);
List<MediaSession.QueueItem> queue = convertToQueue(
musicProvider.getMusicsByGenre(categoryValue));
return queue;
}
public static final List<MediaSession.QueueItem> getPlayingQueueFromSearch(String query,
MusicProvider musicProvider) {
LogHelper.e(TAG, "Creating playing queue for musics from search ", query);
return convertToQueue(musicProvider.searchMusics(query));
}
public static final int getMusicIndexOnQueue(Iterable<MediaSession.QueueItem> queue,
String mediaId) {
int index = 0;
for (MediaSession.QueueItem item: queue) {
if (mediaId.equals(item.getDescription().getMediaId())) {
return index;
}
index++;
}
return -1;
}
public static final int getMusicIndexOnQueue(Iterable<MediaSession.QueueItem> queue,
long queueId) {
int index = 0;
for (MediaSession.QueueItem item: queue) {
if (queueId == item.getQueueId()) {
return index;
}
index++;
}
return -1;
}
private static final List<MediaSession.QueueItem> convertToQueue(
Iterable<MediaMetadata> tracks) {
List<MediaSession.QueueItem> queue = new ArrayList<>();
int count = 0;
for (MediaMetadata track : tracks) {
// We don't expect queues to change after created, so we use the item index as the
// queueId. Any other number unique in the queue would work.
MediaSession.QueueItem item = new MediaSession.QueueItem(
track.getDescription(), count++);
queue.add(item);
}
return queue;
}
/**
* Create a random queue. For simplicity sake, instead of a random queue, we create a
* queue using the first genre,
*
* @param musicProvider
* @return
*/
public static final List<MediaSession.QueueItem> getRandomQueue(MusicProvider musicProvider) {
Iterator<String> genres = musicProvider.getGenres().iterator();
if (!genres.hasNext()) {
return new ArrayList<>();
}
String genre = genres.next();
Iterable<MediaMetadata> tracks = musicProvider.getMusicsByGenre(genre);
return convertToQueue(tracks);
}
public static final boolean isIndexPlayable(int index, List<MediaSession.QueueItem> queue) {
return (queue != null && index >= 0 && index < queue.size());
}
}
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