decode Hex Str to byte array - Android java.lang

Android examples for java.lang:Hex

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Description

decode Hex Str to byte array

Demo Code

import android.util.Log;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.regex.Pattern;

public class Main{

    public static byte[] decodeHexStr(final String str) {
        if (str == null) {
            return null;
        }//from w  w  w . j av a 2s  . co m
        char[] charArray = str.toCharArray();
        if (charArray.length % 2 != 0) {
            throw new RuntimeException(
                    "hex str length must can mod 2, str:" + str);
        }
        byte[] bytes = new byte[charArray.length / 2];
        for (int i = 0; i < charArray.length; i++) {
            char c = charArray[i];
            int b;
            if (c >= '0' && c <= '9') {
                b = (c - '0') << 4;
            } else if (c >= 'A' && c <= 'F') {
                b = (c - 'A' + 10) << 4;
            } else {
                throw new RuntimeException("unsport hex str:" + str);
            }
            c = charArray[++i];
            if (c >= '0' && c <= '9') {
                b |= c - '0';
            } else if (c >= 'A' && c <= 'F') {
                b |= c - 'A' + 10;
            } else {
                throw new RuntimeException("unsport hex str:" + str);
            }
            bytes[i / 2] = (byte) b;
        }
        return bytes;
    }

}

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