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Saturday, 14 April 2012

Zipping File and Folder in android

While we are attaching any folder/file to mail or other attachment so we really need to attach folder with more than one sub folder. So we need to compress it so called zipping . It necessary in Mobile OS as in Windows. So for this android provide ZipOutPutStream and ZipEntry. ZipOutPutStream read complete folder and then ZipEntry zip all the file inside folder to a new compress folder. Zipping File is very easy.If you want dynamically select which file/folder to zipped then see this

import android.util.Log; 
import java.io.BufferedInputStream; 
import java.io.BufferedOutputStream; 
import java.io.FileInputStream; 
import java.io.FileOutputStream; 
import java.util.zip.ZipEntry; 
import java.util.zip.ZipOutputStream; 
 
 
public class Compress { 
  private static final int BUFFER = 2048; 
 
  private String[] _files; 
  private String _zipFile; 
 
  public Compress(String[] files, String zipFile) { 
    _files = files; 
    _zipFile = zipFile; 
  } 
 
  public void zip() { 
    try  { 
      BufferedInputStream origin = null; 
      FileOutputStream dest = new FileOutputStream(_zipFile); 
 
      ZipOutputStream out = new ZipOutputStream(new BufferedOutputStream(dest)); 
 
      byte data[] = new byte[BUFFER]; 
 
      for(int i=0; i < _files.length; i++) { 
        Log.v("Compress", "Adding: " + _files[i]); 
        FileInputStream fi = new FileInputStream(_files[i]); 
        origin = new BufferedInputStream(fi, BUFFER); 
        ZipEntry entry = new ZipEntry(_files[i].substring(_files[i].lastIndexOf("/") + 1)); 
        out.putNextEntry(entry); 
        int count; 
        while ((count = origin.read(data, 0, BUFFER)) != -1) { 
          out.write(data, 0, count); 
        } 
        origin.close(); 
      } 
 
      out.close(); 
    } catch(Exception e) { 
      e.printStackTrace(); 
    } 
 
  } 
} 

In constructor we have two string parameter.first pass array of file inside a folder .Then file path to which zipped folder will save if it is not present then this code will create new zip folder.
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