Android: compile error Util.toByteArray (taken from an example)

Question

I am trying to compile this sample of code in my Android app to have crypt/decrypt feature. I found that code here http://apachejava.blogspot.it/2012/04/androidencryption-made-e

Answer 1

Part of the needed code is missing in the page you link : the author forgot to show his Util class which obviously contains a toByteArray function.

Solution 1 : use commons IO

Replace

Util.toByteArray(cis);   

by

IOUtils.toByteArray(cis);

IOUtils is a Apache commons IO utility class.

You'll need

• to download the commons IO jar (see link) and set your classpath accordingly
• this import at the start of your class : import org.apache.commons.io.IOUtils;

Solution 2 : write a toByteArray function

Define this function :

public byte[] toByteArray(InputStream is) throws IOException {
    ByteArrayOutputStream buffer = new ByteArrayOutputStream();
    int l;
    byte[] data = new byte[1024];
    while ((l = is.read(data, 0, data.length)) != -1) {
      buffer.write(data, 0, l);
    }
    buffer.flush();
    return buffer.toByteArray();
}

And replace Util.toByteArray(cis); by toByteArray(cis);.