Resume Download not working in android

Question

This code for resuming download is not working properly in Android, although it works fine in a Java application. Here I am trying to download a zip file, and it will resume

Answer 1

HttpURLConnection connection = (HttpURLConnection) url.openConnection();
int buf = 1024;

if (ISSUE_DOWNLOAD_STATUS.intValue() == ECMConstant.ECM_DOWNLOADING) {
    File file = new File(DESTINATION_PATH);
    if (file.exists()) {
         downloaded = (int) file.length();
         connection.setRequestProperty("Range",
             "bytes=" + file.length() + "-");
    }
} else {
    connection.setRequestProperty("Range", "bytes=" + downloaded + "-");
}

connection.setDoInput(true);
connection.setDoOutput(true);

progressBar.setMax(connection.getContentLength());
in = new BufferedInputStream(connection.getInputStream());
fos = new FileOutputStream(DESTINATION_PATH, downloaded == 0 ? false : true);
bout = new BufferedOutputStream(fos, buf);
byte[] data = new byte[buf];

while ((int x = in.read(data, 0, buf)) >= 0) {
    bout.write(data, 0, x);
    downloaded += x;
    progressBar.setProgress(downloaded);
}

Answer 2

Your zip file is corrupted because you think that the stream resumes from the range byte that you specified. It actually streams from the beginning again, and so you have a file bigger than the original. Long story short, your server does not support the range property.