问将字符串转换为字节的NumberFormatException

EN

fun getEncodedData(data: String): String? {

        val MD5 = "MD5"

        // Create MD5 Hash
        val digest = java.security.MessageDigest
            .getInstance(MD5)

        digest.update(data.toByte())
        val messageDigest = digest.digest()

        // Create Hex String
        val hexString = StringBuilder()
        for (aMessageDigest in messageDigest) {
            var h = Integer.toHexString(0xFF and aMessageDigest.toInt())
            while (h.length < 2)
                h = "0$h"
            hexString.append(h)
        }
        return hexString.toString()
    }