android debug key hash for api 28

DebugKeyHash.kt

    @SuppressLint("WrongConstant")
    fun getKeyHash(): String? {
        try {
            if (Build.VERSION.SDK_INT >= 28) {
                val info: PackageInfo = packageManager.getPackageInfo(packageName, PackageManager.GET_SIGNING_CERTIFICATES)
                val signatures: Array<Signature> = info.signingInfo.apkContentsSigners
                val md: MessageDigest = MessageDigest.getInstance("SHA")
                for (signature in signatures) {
                    md.update(signature.toByteArray())
                    return Base64.encodeToString(md.digest(), Base64.NO_WRAP)
                }
            } else {
                val info: PackageInfo = packageManager.getPackageInfo(packageName, PackageManager.GET_SIGNATURES)
                val md: MessageDigest = MessageDigest.getInstance("SHA")
                for(signature in info.signatures) {
                    md.update(signature.toByteArray())
                    return Base64.encodeToString(md.digest(), Base64.NO_WRAP)
                }
            }
        } catch (e: PackageManager.NameNotFoundException) {
            e.printStackTrace()
            return null
        } catch (e: NoSuchAlgorithmException) {
            e.printStackTrace()
            return null
        }

        return null
    }