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();
}
/**
* Get the list of music tracks from a server and caches the track information for future
* reference, keying tracks by musicId and grouping by genre.
*/
public void retrieveMediaAsync(final Callback callback) {
LogHelper.d(TAG, "retrieveMediaAsync called");
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<Void, Void, State>() {
@Override
protected State doInBackground(Void... params) {
retrieveMedia();
return mCurrentState;
}
@Override
protected void onPostExecute(State current) {
if (callback != null) {
callback.onMusicCatalogReady(current == State.INITIALIZED);
}
}
}.execute();
}