Installing application after download: `There is a p‌r‌o‌b‌l‌e‌m parsing the package`

Question

I am trying to download an install a .apk file from an application. Here are 3 different situations:

1. From Eclipse to Tablet via adb > Run application > No problems
2. From Eclipse > Sign & Export > Transfer .apk file to tablet via USB > Install & Run application > No problems
3. From Eclipse > Sign & Export > (The same file from 2.) Upload .apk file to a server > Download .apk file from application > Try to install > "There is a problem parsing the package"

code for downloading the application:

private class DownloadFile extends AsyncTask<String, Integer, String> {
    @Override
    protected String doInBackground(String... sUrl) {
        try {
            URL url = new URL(sUrl[0]);
            URLConnection connection = url.openConnection();
            connection.connect();
            // this will be useful so that you can show a typical 0-100% progress bar
            int fileLength = connection.getContentLength();

            // download the file
            InputStream input = new BufferedInputStream(url.openStream());
            OutputStream output = new FileOutputStream(Environment.getExternalStorageDirectory() + File.separator + "Download" + File.separator + "Design102.apk");

            byte data[] = new byte[1024];
            long total = 0;
            int count;
            while ((count = input.read(data)) != -1) {
                total += count;
                // publishing the progress....
                publishProgress((int) (total * 100 / fileLength));
                output.write(data, 0, count);
            }
            output.flush();
            output.close();
            input.close();

        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }
}

Why am I getting "There is a problem parsing the package" error for the same .apk file after downloading?

Answer 1

The following minor modification fixed my problem:

       while ((count = input.read(data)) > 0)