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    <p>The zip function brianestey provided works well, but the unzip function is very slow due to reading one byte at a time. Here is a modified version of his unzip function that utilizes a buffer and is much faster.</p> <pre><code>/** * Unzip a zip file. Will overwrite existing files. * * @param zipFile Full path of the zip file you'd like to unzip. * @param location Full path of the directory you'd like to unzip to (will be created if it doesn't exist). * @throws IOException */ public static void unzip(String zipFile, String location) throws IOException { int size; byte[] buffer = new byte[BUFFER_SIZE]; try { if ( !location.endsWith(File.separator) ) { location += File.separator; } File f = new File(location); if(!f.isDirectory()) { f.mkdirs(); } ZipInputStream zin = new ZipInputStream(new BufferedInputStream(new FileInputStream(zipFile), BUFFER_SIZE)); try { ZipEntry ze = null; while ((ze = zin.getNextEntry()) != null) { String path = location + ze.getName(); File unzipFile = new File(path); if (ze.isDirectory()) { if(!unzipFile.isDirectory()) { unzipFile.mkdirs(); } } else { // check for and create parent directories if they don't exist File parentDir = unzipFile.getParentFile(); if ( null != parentDir ) { if ( !parentDir.isDirectory() ) { parentDir.mkdirs(); } } // unzip the file FileOutputStream out = new FileOutputStream(unzipFile, false); BufferedOutputStream fout = new BufferedOutputStream(out, BUFFER_SIZE); try { while ( (size = zin.read(buffer, 0, BUFFER_SIZE)) != -1 ) { fout.write(buffer, 0, size); } zin.closeEntry(); } finally { fout.flush(); fout.close(); } } } } finally { zin.close(); } } catch (Exception e) { Log.e(TAG, "Unzip exception", e); } } </code></pre>
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    1. POHow to zip and unzip the files?
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    1. COThis unzip didn't work for me. I was getting errors because it was trying to unzip a file before its parent directory. In the else statement I added a condition to create the parent directory if it doesn't exist. Now that works.
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    2. CO@J-L Thanks for pointing that out. I've edited the code accordingly.
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