Android How to - Zip Directory

Question

We would like to know how to zip Directory.
Answer

/*  w  w  w. java 2 s  . c o  m*/
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Enumeration;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;
import java.util.zip.ZipOutputStream;

public class Main {

  public static final void zipDirectory( File directory, File zip ) throws IOException {
    ZipOutputStream zos = new ZipOutputStream( new FileOutputStream( zip ) );
    zip( directory, directory, zos );
    zos.close();
  }

  private static final void zip(File directory, File base, ZipOutputStream zos) throws IOException {
    File[] files = directory.listFiles();
    byte[] buffer = new byte[8192];
    int read = 0;
    for (int i = 0, n = files.length; i < n; i++) {
      if (files[i].isDirectory()) {
        zip(files[i], base, zos);
      } else {
        FileInputStream in = new FileInputStream(files[i]);
        ZipEntry entry = new ZipEntry(files[i].getPath().substring(
            base.getPath().length() + 1));
        zos.putNextEntry(entry);
        while (-1 != (read = in.read(buffer))) {
          zos.write(buffer, 0, read);
        }
        in.close();
      }
    }
  }

  public final void unzip(File zip, File extractTo) throws IOException {
    ZipFile archive = new ZipFile(zip);
    Enumeration e = archive.entries();
    while (e.hasMoreElements()) {
      ZipEntry entry = (ZipEntry) e.nextElement();
      File file = new File(extractTo, entry.getName());
      if (entry.isDirectory() && !file.exists()) {
        file.mkdirs();
      } else {
        if (!file.getParentFile().exists()) {
          file.getParentFile().mkdirs();
        }

        InputStream in = archive.getInputStream(entry);
        BufferedOutputStream out = new BufferedOutputStream(
            new FileOutputStream(file));

        byte[] buffer = new byte[8192];
        int read;

        while (-1 != (read = in.read(buffer))) {
          out.write(buffer, 0, read);
        }

        in.close();
        out.close();
      }
    }
  }
}