Extrakting Zip to SD-Card is very slow. How can i optimize performance?

You are reading and writing a byte at a time. Consider reading and writing a larger block at a time.

Just use this method once and believe me its a super fast process.. It will unzip all the files without skipping any file with in 1 second.

    public boolean rajDhaniSuperFastUnzip(String inputZipFile, String destinationDirectory)        {    try {        int BUFFER = 2048;        List<String> zipFiles = new ArrayList<String>();        File sourceZipFile = new File(inputZipFile);        File unzipDestinationDirectory = new File(destinationDirectory);        unzipDestinationDirectory.mkdir();        ZipFile zipFile;        zipFile = new ZipFile(sourceZipFile, ZipFile.OPEN_READ);        Enumeration<?> zipFileEntries = zipFile.entries();        while (zipFileEntries.hasMoreElements()) {            ZipEntry entry = (ZipEntry) zipFileEntries.nextElement();            String currentEntry = entry.getName();            File destFile = new File(unzipDestinationDirectory, currentEntry);            if (currentEntry.endsWith(".zip")) {                zipFiles.add(destFile.getAbsolutePath());            }            File destinationParent = destFile.getParentFile();            destinationParent.mkdirs();            try {                if (!entry.isDirectory()) {                    BufferedInputStream is =                            new BufferedInputStream(zipFile.getInputStream(entry));                    int currentByte;                    byte data[] = new byte[BUFFER];                    FileOutputStream fos = new FileOutputStream(destFile);                    BufferedOutputStream dest =                            new BufferedOutputStream(fos, BUFFER);                    while ((currentByte = is.read(data, 0, BUFFER)) != -1) {                        dest.write(data, 0, currentByte);                    }                    dest.flush();                    dest.close();                    is.close();                }            } catch (IOException ioe) {                ioe.printStackTrace();            }        }        zipFile.close();        for (Iterator<String> iter = zipFiles.iterator(); iter.hasNext();) {            String zipName = (String)iter.next();            doUnzip(                zipName,                destinationDirectory +                    File.separatorChar +                    zipName.substring(0,zipName.lastIndexOf(".zip"))            );        }    } catch (IOException e) {        e.printStackTrace();        return false ;    }    return true;}

Hope this will help you.. Happy Coding :)