title: Copying data from one file to another file very slow in android?
body: <p>I am copying data from one file to another file.<br/><br/>
  It takes more time. What's the reason?<br/><br/>
  My code is here<br/><pre>
      public void copyData( InputStream in, OutputStream out ) throws IOException
      {
          try
          {
              in = new CipherInputStream( in, dcipher );
              int numRead = 0;
              byte[] buf = new byte[512];
              while ( ( numRead = in.read( buf ) ) >= 0 )
              {
                  out.write( buf, 0, numRead );
              }
              out.close();
              in.close();
          }
          catch ( java.io.IOException e )
          {
          }
      }
  </pre></p>