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Diffstat (limited to 'MusicDemo/src/main/java/com/example/android/musicservicedemo/model/MusicProvider.java')
-rw-r--r--MusicDemo/src/main/java/com/example/android/musicservicedemo/model/MusicProvider.java296
1 files changed, 0 insertions, 296 deletions
diff --git a/MusicDemo/src/main/java/com/example/android/musicservicedemo/model/MusicProvider.java b/MusicDemo/src/main/java/com/example/android/musicservicedemo/model/MusicProvider.java
deleted file mode 100644
index dd89c2d..0000000
--- a/MusicDemo/src/main/java/com/example/android/musicservicedemo/model/MusicProvider.java
+++ /dev/null
@@ -1,296 +0,0 @@
-/*
- * 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.model;
-
-import android.media.MediaMetadata;
-import android.os.AsyncTask;
-
-import com.example.android.musicservicedemo.utils.LogHelper;
-
-import org.json.JSONArray;
-import org.json.JSONException;
-import org.json.JSONObject;
-
-import java.io.BufferedInputStream;
-import java.io.BufferedReader;
-import java.io.IOException;
-import java.io.InputStream;
-import java.io.InputStreamReader;
-import java.net.URLConnection;
-import java.util.ArrayList;
-import java.util.HashMap;
-import java.util.HashSet;
-import java.util.List;
-import java.util.concurrent.locks.ReentrantLock;
-
-/**
- * Utility class to get a list of MusicTrack's based on a server-side JSON
- * configuration.
- */
-public class MusicProvider {
-
- private static final String TAG = "MusicProvider";
-
- private static final String CATALOG_URL = "http://storage.googleapis.com/automotive-media/music.json";
-
- public static final String CUSTOM_METADATA_TRACK_SOURCE = "__SOURCE__";
-
- private static String JSON_MUSIC = "music";
- private static String JSON_TITLE = "title";
- private static String JSON_ALBUM = "album";
- private static String JSON_ARTIST = "artist";
- private static String JSON_GENRE = "genre";
- private static String JSON_SOURCE = "source";
- private static String JSON_IMAGE = "image";
- private static String JSON_TRACK_NUMBER = "trackNumber";
- private static String JSON_TOTAL_TRACK_COUNT = "totalTrackCount";
- private static String JSON_DURATION = "duration";
-
- private final ReentrantLock initializationLock = new ReentrantLock();
-
- // Categorized caches for music track data:
- private final HashMap<String, List<MediaMetadata>> mMusicListByGenre;
- private final HashMap<String, MediaMetadata> mMusicListById;
-
- private final HashSet<String> mFavoriteTracks;
-
- enum State {
- NON_INITIALIZED, INITIALIZING, INITIALIZED;
- }
-
- private State mCurrentState = State.NON_INITIALIZED;
-
-
- public interface Callback {
- void onMusicCatalogReady(boolean success);
- }
-
- public MusicProvider() {
- mMusicListByGenre = new HashMap<>();
- mMusicListById = new HashMap<>();
- mFavoriteTracks = new HashSet<>();
- }
-
- /**
- * Get an iterator over the list of genres
- *
- * @return
- */
- public Iterable<String> getGenres() {
- if (mCurrentState != State.INITIALIZED) {
- return new ArrayList<String>(0);
- }
- return mMusicListByGenre.keySet();
- }
-
- /**
- * Get music tracks of the given genre
- *
- * @return
- */
- public Iterable<MediaMetadata> getMusicsByGenre(String genre) {
- if (mCurrentState != State.INITIALIZED || !mMusicListByGenre.containsKey(genre)) {
- return new ArrayList<MediaMetadata>();
- }
- return mMusicListByGenre.get(genre);
- }
-
- /**
- * Very basic implementation of a search that filter music tracks which title containing
- * the given query.
- *
- * @return
- */
- public Iterable<MediaMetadata> searchMusics(String titleQuery) {
- ArrayList<MediaMetadata> result = new ArrayList<>();
- if (mCurrentState != State.INITIALIZED) {
- return result;
- }
- titleQuery = titleQuery.toLowerCase();
- for (MediaMetadata track: mMusicListById.values()) {
- if (track.getString(MediaMetadata.METADATA_KEY_TITLE).toLowerCase()
- .contains(titleQuery)) {
- result.add(track);
- }
- }
- return result;
- }
-
- public MediaMetadata getMusic(String mediaId) {
- return mMusicListById.get(mediaId);
- }
-
- public void setFavorite(String mediaId, boolean favorite) {
- if (favorite) {
- mFavoriteTracks.add(mediaId);
- } else {
- mFavoriteTracks.remove(mediaId);
- }
- }
-
- public boolean isFavorite(String musicId) {
- return mFavoriteTracks.contains(musicId);
- }
-
- public boolean isInitialized() {
- return mCurrentState == State.INITIALIZED;
- }
-
- /**
- * Get the list of music tracks from a server and caches the track information
- * for future reference, keying tracks by mediaId and grouping by genre.
- *
- * @return
- */
- public void retrieveMedia(final Callback callback) {
-
- if (mCurrentState == State.INITIALIZED) {
- // Nothing to do, execute callback immediately
- callback.onMusicCatalogReady(true);
- return;
- }
-
- // Asynchronously load the music catalog in a separate thread
- new AsyncTask() {
- @Override
- protected Object doInBackground(Object[] objects) {
- retrieveMediaAsync(callback);
- return null;
- }
- }.execute();
- }
-
- private void retrieveMediaAsync(Callback callback) {
- initializationLock.lock();
-
- try {
- if (mCurrentState == State.NON_INITIALIZED) {
- mCurrentState = State.INITIALIZING;
-
- int slashPos = CATALOG_URL.lastIndexOf('/');
- String path = CATALOG_URL.substring(0, slashPos + 1);
- JSONObject jsonObj = parseUrl(CATALOG_URL);
-
- JSONArray tracks = jsonObj.getJSONArray(JSON_MUSIC);
- if (tracks != null) {
- for (int j = 0; j < tracks.length(); j++) {
- MediaMetadata item = buildFromJSON(tracks.getJSONObject(j), path);
- String genre = item.getString(MediaMetadata.METADATA_KEY_GENRE);
- List<MediaMetadata> list = mMusicListByGenre.get(genre);
- if (list == null) {
- list = new ArrayList<>();
- }
- list.add(item);
- mMusicListByGenre.put(genre, list);
- mMusicListById.put(item.getString(MediaMetadata.METADATA_KEY_MEDIA_ID),
- item);
- }
- }
- mCurrentState = State.INITIALIZED;
- }
- } catch (RuntimeException | JSONException e) {
- LogHelper.e(TAG, e, "Could not retrieve music list");
- } finally {
- if (mCurrentState != State.INITIALIZED) {
- // Something bad happened, so we reset state to NON_INITIALIZED to allow
- // retries (eg if the network connection is temporary unavailable)
- mCurrentState = State.NON_INITIALIZED;
- }
- initializationLock.unlock();
- if (callback != null) {
- callback.onMusicCatalogReady(mCurrentState == State.INITIALIZED);
- }
- }
- }
-
- private MediaMetadata buildFromJSON(JSONObject json, String basePath) throws JSONException {
- String title = json.getString(JSON_TITLE);
- String album = json.getString(JSON_ALBUM);
- String artist = json.getString(JSON_ARTIST);
- String genre = json.getString(JSON_GENRE);
- String source = json.getString(JSON_SOURCE);
- String iconUrl = json.getString(JSON_IMAGE);
- int trackNumber = json.getInt(JSON_TRACK_NUMBER);
- int totalTrackCount = json.getInt(JSON_TOTAL_TRACK_COUNT);
- int duration = json.getInt(JSON_DURATION) * 1000; // ms
-
- LogHelper.d(TAG, "Found music track: ", json);
-
- // Media is stored relative to JSON file
- if (!source.startsWith("http")) {
- source = basePath + source;
- }
- if (!iconUrl.startsWith("http")) {
- iconUrl = basePath + iconUrl;
- }
- // Since we don't have a unique ID in the server, we fake one using the hashcode of
- // the music source. In a real world app, this could come from the server.
- String id = String.valueOf(source.hashCode());
-
- // Adding the music source to the MediaMetadata (and consequently using it in the
- // mediaSession.setMetadata) is not a good idea for a real world music app, because
- // the session metadata can be accessed by notification listeners. This is done in this
- // sample for convenience only.
- return new MediaMetadata.Builder()
- .putString(MediaMetadata.METADATA_KEY_MEDIA_ID, id)
- .putString(CUSTOM_METADATA_TRACK_SOURCE, source)
- .putString(MediaMetadata.METADATA_KEY_ALBUM, album)
- .putString(MediaMetadata.METADATA_KEY_ARTIST, artist)
- .putLong(MediaMetadata.METADATA_KEY_DURATION, duration)
- .putString(MediaMetadata.METADATA_KEY_GENRE, genre)
- .putString(MediaMetadata.METADATA_KEY_ALBUM_ART_URI, iconUrl)
- .putString(MediaMetadata.METADATA_KEY_TITLE, title)
- .putLong(MediaMetadata.METADATA_KEY_TRACK_NUMBER, trackNumber)
- .putLong(MediaMetadata.METADATA_KEY_NUM_TRACKS, totalTrackCount)
- .build();
- }
-
- /**
- * Download a JSON file from a server, parse the content and return the JSON
- * object.
- *
- * @param urlString
- * @return
- */
- private JSONObject parseUrl(String urlString) {
- InputStream is = null;
- try {
- java.net.URL url = new java.net.URL(urlString);
- URLConnection urlConnection = url.openConnection();
- is = new BufferedInputStream(urlConnection.getInputStream());
- BufferedReader reader = new BufferedReader(new InputStreamReader(
- urlConnection.getInputStream(), "iso-8859-1"), 8);
- StringBuilder sb = new StringBuilder();
- String line = null;
- while ((line = reader.readLine()) != null) {
- sb.append(line);
- }
- return new JSONObject(sb.toString());
- } catch (Exception e) {
- LogHelper.e(TAG, "Failed to parse the json for media list", e);
- return null;
- } finally {
- if (is != null) {
- try {
- is.close();
- } catch (IOException e) {
- // ignore
- }
- }
- }
- }
-} \ No newline at end of file
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-18 08:57:23 +0000