zip 解压 android

public static String UnZip(String zipFileName)

{

　　String fileName="";

　　try{

     InputStream inputStream;

　　byte[] buffer=new byte[1024];

   　ZipFile zf= new ZipFile(zipFileName);

　　Enumeration e = zf.entries();

　　  while(e.hasMoreElements())

{

　　ZipEntry ze = (ZipEntry)e.nextElement();

　　inputStream= zf.getInputStream(ze);

　　fileName=ze.getName();

//new String(ze.getName().getBytes("gb2312"),"gb2312");

ze.getSize();

File file=new File("/"+fileName);

OutputStream out = new FileOutputStream(file);

int realLength;

while ((realLength = inputStream.read(buffer)) != -1)

{

         out.write(buffer, 0, realLength);

}

inputStream.close();

out.close();

} catch(Exception e)

{ e.printStackTrace(); }

return fileName; }