Utilizo DownloadManager para obtener el estado de la descarga, pero aún así no funciona, nunca salta a la condiciónif(c.moveToFirst()) y no se por que ¿Podría alguien ayudarme por favor?

<code>private final BroadcastReceiver myReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            String action = intent.getAction();

            if(Intent.ACTION_SCREEN_OFF.equals(action)) {

                DownloadManager downloadMgr = (DownloadManager)getSystemService(DOWNLOAD_SERVICE);
                DownloadManager.Query query = new DownloadManager.Query();
                query.setFilterByStatus(DownloadManager.STATUS_FAILED|DownloadManager.STATUS_PENDING|DownloadManager.STATUS_RUNNING|DownloadManager.STATUS_SUCCESSFUL);
                Cursor c = downloadMgr.query(query);
                if(c==null) {
                    //
                }
                else {
                    if(c.moveToFirst()) {
                        int columnIndex = c.getColumnIndex(DownloadManager.COLUMN_STATUS);
                        int status = c.getInt(columnIndex);
                        if(status == DownloadManager.STATUS_RUNNING){
                        //do something
                        }
                    }
                }
            }
        }
    };
</code>