Convert hex string to byte []

Question

I\'ve got a String like this:

init_thread = \"2b11020000ed\"

I have to send this string via bluetooth, for what I do this:

Answer 1

If we want to convert hex to byte array, we should make sure that hex string length should be of even length. Below method handles this

public static byte[] hexToByteArray(String hex) {
    hex = hex.length()%2 != 0?"0"+hex:hex;

    byte[] b = new byte[hex.length() / 2];

    for (int i = 0; i < b.length; i++) {
        int index = i * 2;
        int v = Integer.parseInt(hex.substring(index, index + 2), 16);
        b[i] = (byte) v;
    }
    return b;
}