unresolved reference hexformat: Android Kotlin

Question

Android 12

I am trying to secure username and password before sending it over the internet to the server. However, I need to convert my strings into HEX and I keep getting HexFormat: unresolved reference error. There seems to be no class or library associated with that. How do I solve this error? Is there a library I need to download and install?

Unresolved Reference: HexFormat

private fun ByteArray.toHexString(): String = HexFormat.of().formatHex(this)
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edit:

did you import import java.util.HexFormat?

tyczj
– tyczj

2025-01-17 17:15:05 +00:00
Commented Jan 17 at 17:15 — tyczj
– tyczj, Commented Jan 17 at 17:15

tyczj · Accepted Answer · 2025-01-17 17:39:32Z

1

HexFormat was add in API 34, Android 12 is API 31 so you wont be able to use it in anything below Android 14

answered Jan 17 at 17:39

tyczj

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2 Comments

ThN Jan 17 at 19:34

I was able to download and update Android Studio API level to 34 easily, but my phone's API level is still 12. I tried to update my phone's software update for the latest and the greatest and still the API level is at 12. It won't change. It looks like to me I have to completely redo my PHONE with the latest and the greatest OPERATING SYSTEM. I believe SOFTWARE UPDATE won't do. Am I correct in saying that?

CommonsWare Jan 17 at 19:45

@ThN: "It looks like to me I have to completely redo my PHONE with the latest and the greatest OPERATING SYSTEM" -- developers have been converting byte arrays to hex values for decades. There is a Kotlin standard function for this in Kotlin 1.9.0 and newer. And there are a variety of other options, including ones for Java that you could adapt.

卡尔斯路西法 · Accepted Answer · 2025-01-22 00:20:23Z

0

use ByteArray.toHexString(format: HexFormat = HexFormat.Default).
package kotlin.text @SinceKotlin("1.9")

answered Jan 22 at 0:20

卡尔斯路西法

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