public static String readFully(Reader reader) throws IOException {
        try {
            StringWriter writer = new StringWriter();
            char[] buffer = new char[1024];
            int count;
            while ((count = reader.read(buffer)) != -1) {
                writer.write(buffer, 0, count);
            }
            return writer.toString();
        } finally {
            reader.close();
        }
    }
Returns the remainder of 'reader' as a string, closing it when done.
app/src/main/java/com/duan/musicoco/cache/DiskLruCache.java