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    <p>This article is about how to write a utility class for extracting files and directories in a compressed zip archive, using built-in Java API.</p> <p>The java.util.zip package provides the following classes for extracting files and directories from a ZIP archive:</p> <p>ZipInputStream: this is the main class which can be used for reading zip file and extracting files and directories (entries) within the archive. Here are some important usages of this class: -read a zip via its constructor ZipInputStream(FileInputStream) -read entries of files and directories via method getNextEntry() -read binary data of current entry via method read(byte) -close current entry via method closeEntry() -close the zip file via method close()</p> <p>ZipEntry: this class represents an entry in the zip file. Each file or directory is represented as a ZipEntry object. Its method getName() returns a String which represents path of the file/directory. The path is in the following form: folder_1/subfolder_1/subfolder_2/…/subfolder_n/file.ext</p> <p>Based on the path of a ZipEntry, we re-create directory structure when extracting the zip file.</p> <p>Below class is used for unzip download zip and extract file and store your desire location.</p> <pre><code> public class UnzipUtil { private String zipFile; private String location; public UnzipUtil(String zipFile, String location) { this.zipFile = zipFile; this.location = location; dirChecker(""); } public void unzip() { try { FileInputStream fin = new FileInputStream(zipFile); ZipInputStream zin = new ZipInputStream(fin); ZipEntry ze = null; while ((ze = zin.getNextEntry()) != null) { Log.v("Decompress", "Unzipping " + ze.getName()); if(ze.isDirectory()) { dirChecker(ze.getName()); } else { FileOutputStream fout = new FileOutputStream(location + ze.getName()); byte[] buffer = new byte[8192]; int len; while ((len = zin.read(buffer)) != -1) { fout.write(buffer, 0, len); } fout.close(); zin.closeEntry(); } } zin.close(); } catch(Exception e) { Log.e("Decompress", "unzip", e); } } private void dirChecker(String dir) { File f = new File(location + dir); if(!f.isDirectory()) { f.mkdirs(); } } } </code></pre> <blockquote> <p>MainActivity.Class:</p> </blockquote> <pre><code> public class MainActivity extends Activity { private ProgressDialog mProgressDialog; String Url="http://hasmukh/hb.zip"; String unzipLocation = Environment.getExternalStorageDirectory() + "/unzipFolder/"; String StorezipFileLocation =Environment.getExternalStorageDirectory() + "/DownloadedZip"; String DirectoryName=Environment.getExternalStorageDirectory() + "/unzipFolder/files/"; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); DownloadZipfile mew = new DownloadZipfile(); mew.execute(url); } //-This is method is used for Download Zip file from server and store in Desire location. class DownloadZipfile extends AsyncTask&lt;String, String, String&gt; { String result =""; @Override protected void onPreExecute() { super.onPreExecute(); mProgressDialog = new ProgressDialog(MainActivity.this); mProgressDialog.setMessage("Downloading..."); mProgressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL); mProgressDialog.setCancelable(false); mProgressDialog.show(); } @Override protected String doInBackground(String... aurl) { int count; try { URL url = new URL(aurl[0]); URLConnection conexion = url.openConnection(); conexion.connect(); int lenghtOfFile = conexion.getContentLength(); InputStream input = new BufferedInputStream(url.openStream()); OutputStream output = new FileOutputStream(StorezipFileLocation); byte data[] = new byte[1024]; long total = 0; while ((count = input.read(data)) != -1) { total += count; publishProgress(""+(int)((total*100)/lenghtOfFile)); output.write(data, 0, count); } output.close(); input.close(); result = "true"; } catch (Exception e) { result = "false"; } return null; } protected void onProgressUpdate(String... progress) { Log.d("ANDRO_ASYNC",progress[0]); mProgressDialog.setProgress(Integer.parseInt(progress[0])); } @Override protected void onPostExecute(String unused) { mProgressDialog.dismiss(); if(result.equalsIgnoreCase("true")) { try { unzip(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } else { } } } //This is the method for unzip file which is store your location. And unzip folder will store as per your desire location. public void unzip() throws IOException { mProgressDialog = new ProgressDialog(MainActivity.this); mProgressDialog.setMessage("Please Wait..."); mProgressDialog.setProgressStyle(ProgressDialog.STYLE_SPINNER); mProgressDialog.setCancelable(false); mProgressDialog.show(); new UnZipTask().execute(StorezipFileLocation, DirectoryName); } private class UnZipTask extends AsyncTask&lt;String, Void, Boolean&gt; { @SuppressWarnings("rawtypes") @Override protected Boolean doInBackground(String... params) { String filePath = params[0]; String destinationPath = params[1]; File archive = new File(filePath); try { ZipFile zipfile = new ZipFile(archive); for (Enumeration e = zipfile.entries(); e.hasMoreElements();) { ZipEntry entry = (ZipEntry) e.nextElement(); unzipEntry(zipfile, entry, destinationPath); } UnzipUtil d = new UnzipUtil(StorezipFileLocation, DirectoryName); d.unzip(); } catch (Exception e) { return false; } return true; } @Override protected void onPostExecute(Boolean result) { mProgressDialog.dismiss(); } private void unzipEntry(ZipFile zipfile, ZipEntry entry,String outputDir) throws IOException { if (entry.isDirectory()) { createDir(new File(outputDir, entry.getName())); return; } File outputFile = new File(outputDir, entry.getName()); if (!outputFile.getParentFile().exists()) { createDir(outputFile.getParentFile()); } // Log.v("", "Extracting: " + entry); BufferedInputStream inputStream = new BufferedInputStream(zipfile.getInputStream(entry)); BufferedOutputStream outputStream = new BufferedOutputStream(new FileOutputStream(outputFile)); try { } finally { outputStream.flush(); outputStream.close(); inputStream.close(); } } private void createDir(File dir) { if (dir.exists()) { return; } if (!dir.mkdirs()) { throw new RuntimeException("Can not create dir " + dir); } }} } Note: Do not forgot to add below permission in android Manifest.xml file. &lt;uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" &gt;&lt;/uses-permission&gt; &lt;uses-permission android:name="android.permission.INTERNET" /&gt; </code></pre> <p><a href="http://androidroadies.blogspot.in/2013/09/unzipping-files-with-android.html" rel="noreferrer">Read More</a></p>
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