Zipped file is not as original after unzipping it

Question

Actually i'm using a method to zip a generated txt file in my android app, in the following txt file there are data separed by enter like

123213213
123213132
424242244

But if i zip this file and unzip it on my computer the following file will be

123213213□123213132□424242244

Here is the method that i'm using to zip the file

public void zip(String files, String zipFile) throws IOException {
    BufferedInputStream origin;
    try (ZipOutputStream out = new ZipOutputStream(new BufferedOutputStream(new FileOutputStream(zipFile)))) {
        byte[] data = new byte[BUFFER_SIZE];

        FileInputStream fi = new FileInputStream(files);
        origin = new BufferedInputStream(fi, BUFFER_SIZE);
        try {
            ZipEntry entry = new ZipEntry(files.substring(files.lastIndexOf("/") + 1));
            out.putNextEntry(entry);
            int count;
            while ((count = origin.read(data, 0, BUFFER_SIZE)) != -1) {
                out.write(data, 0, count);
            }
        } finally {
            origin.close();
        }
    }
}