private synchronized void retrieveMedia() {
try {
if (mCurrentState == State.NON_INITIALIZED) {
mCurrentState = State.INITIALIZING;
int slashPos = CATALOG_URL.lastIndexOf('/');
String path = CATALOG_URL.substring(0, slashPos + 1);
JSONObject jsonObj = fetchJSONFromUrl(CATALOG_URL);
if (jsonObj == null) {
return;
}
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 musicId = item.getString(MediaMetadata.METADATA_KEY_MEDIA_ID);
mMusicListById.put(musicId, new MutableMediaMetadata(musicId, item));
}
buildListsByGenre();
}
mCurrentState = State.INITIALIZED;
}
} catch (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;
}
}
}
public synchronized void updateMusic(String musicId, MediaMetadata metadata) {
MutableMediaMetadata track = mMusicListById.get(musicId);
if (track == null) {
return;
}
String oldGenre = track.metadata.getString(MediaMetadata.METADATA_KEY_GENRE);
String newGenre = metadata.getString(MediaMetadata.METADATA_KEY_GENRE);
track.metadata = metadata;
// if genre has changed, we need to rebuild the list by genre
if (!oldGenre.equals(newGenre)) {
buildListsByGenre();
}
}