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Volley is a network library from Android source code. I have integrated gson and okhttp with it.

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package com.android.volley;

import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

/**
 * User: mcxiaoke
 * Date: 15/3/17
 * Time: 14:47
 */
class InternalUtils {

    // http://stackoverflow.com/questions/9655181/convert-from-byte-array-to-hex-string-in-java
    private final static char[] HEX_CHARS = "0123456789ABCDEF".toCharArray();

    private static String convertToHex(byte[] bytes) {
        char[] hexChars = new char[bytes.length * 2];
        for (int j = 0; j < bytes.length; j++) {
            int v = bytes[j] & 0xFF;
            hexChars[j * 2] = HEX_CHARS[v >>> 4];
            hexChars[j * 2 + 1] = HEX_CHARS[v & 0x0F];
        }
        return new String(hexChars);
    }

    public static String sha1Hash(String text) {
        String hash = null;
        try {
            final MessageDigest digest = MessageDigest.getInstance("SHA-1");
            final byte[] bytes = text.getBytes("UTF-8");
            digest.update(bytes, 0, bytes.length);
            hash = convertToHex(digest.digest());
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        return hash;
    }


}