无法从我的Android应用项目中的Dropbox访问静态JSON文件

Question

我正在制作一个音乐播放器Android应用程序，我无法弄清楚为什么我的JSON文件没有运行。我已将文件存储在Dropbox中，并且我在外部使用它。

public class RemoteJSONSource implements MusicProviderSource {

private static final String TAG = LogHelper.makeLogTag(RemoteJSONSource.class);

protected static final String CATALOG_URL =
    "http://storage.googleapis.com/automotive-media/music.json";

private static final String JSON_MUSIC = "music";
private static final String JSON_TITLE = "title";
private static final String JSON_ALBUM = "album";
private static final String JSON_ARTIST = "artist";
private static final String JSON_GENRE = "genre";
private static final String JSON_SOURCE = "source";
private static final String JSON_IMAGE = "image";
private static final String JSON_TRACK_NUMBER = "trackNumber";
private static final String JSON_TOTAL_TRACK_COUNT = "totalTrackCount";
private static final String JSON_DURATION = "duration";