Android How to - Zip and unzip file

Question

We would like to know how to zip and unzip file.
Answer

//from   www  .j  a  v  a  2 s  . c om
import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;

/**
 * Utility file related to file compression/unzip
 */
public class Main {

  /**
   * Unzip the specified file from a file 
   * 
   * Be sure to set : <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
   * 
   * Modified from:  
   * Source: http://stackoverflow.com/questions/3382996/how-to-unzip-files-programmatically-in-android
   * 
   * @param zip target zip file
   * @param unpackPath path where file should be unpacked
   * @return
   */
  public static boolean unpackZip(File zip, String unpackPath) {
              
    InputStream is;
    ZipInputStream zis;
    try {
                
      String filename;          
      is = new FileInputStream(zip);
      zis = new ZipInputStream(new BufferedInputStream(is));
      ZipEntry ze;
      byte[] buffer = new byte[1024];
      int count;

      while ((ze = zis.getNextEntry()) != null) {
        
        filename = ze.getName();
        FileOutputStream fout = new FileOutputStream(unpackPath + filename);

        while ((count = zis.read(buffer)) != -1) {
          fout.write(buffer, 0, count);
        }

        fout.close();
        zis.closeEntry();
      }

      zis.close();
    } catch (IOException e) {
      e.printStackTrace();
      return false;
    }
    
    return true;
  }
  
  
  /**
   * Unzip the specified file from a file 
   * 
   * Be sure to set : <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
   * 
   * Modified from:  
   * Source: http://stackoverflow.com/questions/3382996/how-to-unzip-files-programmatically-in-android
   * 
   * @param file input stream 
   * @param unpackPath path where file should be unpacked
   * @return
   */
  public static boolean unpackZip(InputStream zipStream, String unpackPath) {
              
    InputStream is;
    ZipInputStream zis;
    try {
                
      String filename;                
      zis = new ZipInputStream(new BufferedInputStream(zipStream));
      ZipEntry ze;
      byte[] buffer = new byte[1024];
      int count;

      while ((ze = zis.getNextEntry()) != null) {
        
        filename = ze.getName();
        FileOutputStream fout = new FileOutputStream(unpackPath + filename);

        while ((count = zis.read(buffer)) != -1) {
          fout.write(buffer, 0, count);
        }

        fout.close();
        zis.closeEntry();
      }

      zis.close();
    } catch (IOException e) {
      e.printStackTrace();
      return false;
    }
    
    return true;
  }

}