令人惊讶的是(对我来说)，这段代码并没有达到我的目的:
fun ByteArray.toHexString() : String {
return this.joinToString("") { it.toString(16) }
}
结果是Byte是signed，所以您得到了单个字节的负祸不单行表示，这导致了一个完全虚假的最终结果.
Also, Byte.toString won't pad leading zeroes, which you'd want here.
最简单的(没有附加库，理想情况下没有扩展)resp是什么.最有效的解决方案？
As I am on Kotlin 1.3 you may also be interested in the UByte soon (note that it's an experimental feature. See also Kotlin 1.3M1 and 1.3M2 announcement)
E.g.:
@ExperimentalUnsignedTypes // just to make it clear that the experimental unsigned types are used
fun ByteArray.toHexString() = asUByteArray().joinToString("") { it.toString(16).padStart(2, '0') }
格式化选项可能是其他变体中最好的(但可能不那么容易阅读……而且我总是忘了它是怎么工作的，所以肯定不容易记住(对我来说:-):
fun ByteArray.toHexString() = joinToString("") { "%02x".format(it) }