Java tutorial
/* * Copyright (C) 2014 The Android Open Source Project * * 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.phearom.um.model; import android.support.v4.media.MediaMetadataCompat; import com.phearom.um.config.Config; import com.phearom.um.utils.LogHelper; import org.json.JSONArray; import org.json.JSONException; import org.json.JSONObject; import java.io.BufferedReader; import java.io.DataOutputStream; import java.io.InputStreamReader; import java.net.HttpURLConnection; import java.net.URL; import java.util.ArrayList; import java.util.HashMap; import java.util.Iterator; import java.util.Map; /** * Utility class to get a list of MusicTrack's based on a server-side JSON * configuration. */ public class RemoteJSONSource implements MusicProviderSource { private static final String TAG = LogHelper.makeLogTag(RemoteJSONSource.class); protected static final String CATALOG_URL = Config.AUTH.SERVER_IP + "musicservice/web_server/getkhmernewmusic"; private static final String JSON_MUSIC = "result"; private static final String JSON_TITLE = "music_title"; private static final String JSON_ALBUM = "image_album"; private static final String JSON_ARTIST = "singer_name"; private static final String JSON_GENRE = "albums"; private static final String JSON_SOURCE = "music_path"; private static final String JSON_IMAGE = "image_thumb"; private static final String JSON_DURATION = "music_duration"; @Override public Iterator<MediaMetadataCompat> iterator() { try { int slashPos = CATALOG_URL.lastIndexOf('/'); String path = CATALOG_URL.substring(0, slashPos + 1); JSONObject jsonObj = sendPost(CATALOG_URL); ArrayList<MediaMetadataCompat> tracks = new ArrayList<>(); if (jsonObj != null) { JSONArray jsonTracks = jsonObj.getJSONArray(JSON_MUSIC); if (jsonTracks != null) { for (int j = 0; j < jsonTracks.length(); j++) { tracks.add(buildFromJSON(jsonTracks.getJSONObject(j), path)); } } } return tracks.iterator(); } catch (Exception e) { LogHelper.e(TAG, e, "Could not retrieve music list"); throw new RuntimeException("Could not retrieve music list", e); } } private long duration = 0; private MediaMetadataCompat 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); // try { // MediaMetadataRetriever metaRetriever = new MediaMetadataRetriever(); // metaRetriever.setDataSource(source); // String time = metaRetriever.extractMetadata(MediaMetadataRetriever.METADATA_KEY_DURATION); // // Log.i("Duration",time); // // duration = Long.valueOf(time); // } catch (Exception e) { // e.printStackTrace(); // } 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; } String id = String.valueOf(source.hashCode()); //noinspection ResourceType return new MediaMetadataCompat.Builder().putString(MediaMetadataCompat.METADATA_KEY_MEDIA_ID, id) .putString(MusicProviderSource.CUSTOM_METADATA_TRACK_SOURCE, source) .putString(MediaMetadataCompat.METADATA_KEY_ALBUM, album) .putString(MediaMetadataCompat.METADATA_KEY_ARTIST, artist) .putLong(MediaMetadataCompat.METADATA_KEY_DURATION, duration) .putString(MediaMetadataCompat.METADATA_KEY_GENRE, genre) .putString(MediaMetadataCompat.METADATA_KEY_ALBUM_ART_URI, iconUrl) .putString(MediaMetadataCompat.METADATA_KEY_TITLE, title).build(); } // private JSONObject fetchJSONFromUrl(String urlString) throws JSONException { // BufferedReader reader = null; // String response = ""; // try { // URL url = new URL(urlString); // HttpURLConnection connection = (HttpURLConnection) url.openConnection(); // // Map<String, String> params = new HashMap<>(); // params.put("limit", "25"); // params.put("offset", "0"); // // String parameter = params.toString().replace(",", "&"); // // Log.i("Param", parameter); // // connection.setRequestMethod("POST"); // connection.setDoOutput(true); // DataOutputStream dStream = new DataOutputStream(connection.getOutputStream()); // dStream.writeBytes(parameter); // dStream.flush(); // dStream.close(); // // int responseCode = connection.getResponseCode(); // if (responseCode == HttpsURLConnection.HTTP_OK) { // String line; // BufferedReader bf = new BufferedReader(new InputStreamReader(connection.getInputStream())); // while ((line = bf.readLine()) != null) { // response += line; // } // } else { // response = ""; // } // return new JSONObject(response); // } catch (JSONException e) { // throw e; // } catch (Exception e) { // LogHelper.e(TAG, "Failed to parse the json for media list", e); // return null; // } finally { // if (reader != null) { // try { // reader.close(); // } catch (IOException e) { // e.printStackTrace(); // } // } // } // } private JSONObject sendPost(String urlString) throws Exception { URL url = new URL(urlString); HttpURLConnection con = (HttpURLConnection) url.openConnection(); //add reuqest header con.setRequestMethod("POST"); con.setRequestProperty("User-Agent", "Mozilla/5.0"); con.setRequestProperty("Accept-Language", "en-US,en;q=0.5"); Map<String, String> params = new HashMap<>(); params.put("limit", "25"); params.put("offset", "0"); String parameter = params.toString().replace(",", "&"); // Send post request con.setDoOutput(true); DataOutputStream wr = new DataOutputStream(con.getOutputStream()); wr.writeBytes(parameter); wr.flush(); wr.close(); BufferedReader in = new BufferedReader(new InputStreamReader(con.getInputStream())); String inputLine; StringBuffer response = new StringBuffer(); while ((inputLine = in.readLine()) != null) { response.append(inputLine); } in.close(); return new JSONObject(response.toString()); } }