将十六进制字符串转换为字节而不是字节数组

Question

i needed to convert hex which i get from color code

int color = singleColor.getColor();

                String rgbString = "R: " + Color.red(color) + " B: " + Color.blue(color) + " G: " + Color.green(color);
                String hexRed = "0x" + Integer.toHexString(Color.red(color));
                String hexGreen = "0x" + Integer.toHexString(Color.green(color));
                String hexBlue= "0x" + Integer.toHexString(Color.blue(color));
                Log.e("hex string", hexRed + hexGreen + hexBlue);

log generated is........ 0xb30x120xff

which is completed i wanted

but i want to convert this in byte and then join them as byte array like this which is working completely ok

byte[] hex_txt = {(byte)0xff, (byte)0x00, (byte)0x00};
sendData(hex_txt);

my question is how to convert this string to like this so i can send data....

byte byteRed = Byte.valueOf(hexRed);

this is not working number format exception also tried other solutions which are not working

advance thx for help

Answer 1

You can only convert Strings to a byte array and vice versa.

        String example = "This is an example";
        byte[] bytes = example.getBytes();

        System.out.println("Text : " + example);
        System.out.println("Text [Byte Format] : " + bytes);

Google "convert String to byte" and you will find plenty on converting string to byte[]

http://www.mkyong.com/java/how-do-convert-string-to-byte-in-java/