Android String to Hex Byte Array Convert stringToHexByte(String str)

Description

string To Hex Byte

Parameter

Parameter	Description
str	a parameter

Declaration

public static byte[] stringToHexByte(String str) 

Method Source Code

//package com.java2s;
import java.io.UnsupportedEncodingException;

import android.annotation.SuppressLint;

public class Main {

    public static byte[] stringToHexByte(String str) {
        String hexString = bytesToHexString(str.getBytes());
        return hexStringToBytes(hexString);
    }/*  w w w. j  av  a  2s . c o m*/

    public static String bytesToHexString(byte[] bytes) {
        StringBuilder sb = new StringBuilder("");

        if (bytes == null || bytes.length <= 0) {
            return null;
        }

        for (int i = 0; i < bytes.length; i++) {
            int v = bytes[i] & 0xFF;
            String hv = Integer.toHexString(v);
            if (hv.length() < 2) {
                sb.append(0);
            }
            sb.append(hv);
        }

        return sb.toString();
    }

    /**
     * Convert hex string to byte[]
     * 
     * @param hexString
     *            the hex string
     * @return byte[]
     */
    @SuppressLint("DefaultLocale")
    public static byte[] hexStringToBytes(String hexString) {
        if (hexString == null || hexString.equals("")) {
            return null;
        }
        hexString = hexString.toUpperCase();
        int byteArrayLength = hexString.length() / 2;
        char[] hexChars = hexString.toCharArray();

        byte[] d = new byte[byteArrayLength];
        for (int i = 0; i < byteArrayLength; i++) {
            int pos = i * 2;
            d[i] = (byte) (charToByte(hexChars[pos]) << 4 | charToByte(hexChars[pos + 1]));
        }
        return d;
    }

    public static String toHexString(String str) {
        byte[] byteArray;
        try {
            byteArray = str.getBytes("utf-8");
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
            byteArray = str.getBytes();
        }
        return bytesToHexString(byteArray);
    }

    /**
     * Convert char to byte
     * 
     * @param c
     *            char
     * @return byte
     */
    private static byte charToByte(char c) {
        return (byte) "0123456789ABCDEF".indexOf(c);
    }
}

Related

1. hexStringToBytes(String hexString)
2. hexStr2Bytes(String src)
3. hexStringToBytes(String hex)
4. getBytes(String hexString)