Unable to use dgca-app-core-android on Android 7 (24) devices

[robzerg]

Hi,

I integrated your dgci-app-core-android library in my app which is minsdk 24 (Android 7).
Your decoder is working fine except on Android 7 devices.

What is the reason that your libraries minSDK is 26?
Is there a way to make it work for SDK 24 (Android 7) devices?

Thanks or your feedback!

Best regards
Robert

[robzerg]

You use Java 8 time api which is available since api 26.

You could use time api on api < 26 by following the steps in this artice: https://tunesoftware.com/apps/java-8-date-time-classes-in-android-below-api-26/

Don't know if this interests you somehow :)

[lubagov]

I month ago try to use Android 7.0, 24 API level, it fine working, expect one thing. Java time API can be fixed over "deshugaring" gradle plugin.
But Kotlin reflection API not work correct:

    compileOptions {
        sourceCompatibility Config.javaVersion
        targetCompatibility Config.javaVersion
        coreLibraryDesugaringEnabled true
    }

So you need enable, some like, in dependences app level:
coreLibraryDesugaring Deps.desugar_jdk_libs
and in Versions.kt:
const val desugar_jdk_libs = "1.1.5"
and dependences.kt:
const val desugar_jdk_libs = "com.android.tools:desugar_jdk_libs:${Versions.desugar_jdk_libs}"
then instead of ZonedDateTime when running on API 24 it will convert it to Date.
And this all things already enabled in sources...

One more thing if i remember correct... it is, in file dgc-certlogic-android/engine/src/main/java/dgca/verifier/app/engine/data/ExternalParameter.kt

class ExternalParameter private constructor(
    val validationClock: String,
    val valueSets: Map<String, List<String>>,
    val countryCode: String,
    val exp: String,
    val iat: String,
    val issuerCountryCode: String,
    val kid: String,
    val region: String = ""
) {
    companion object {
        fun createInstance(
            validationClock: ZonedDateTime,
            valueSets: Map<String, List<String>>,
            countryCode: String,
            exp: ZonedDateTime,
            iat: ZonedDateTime,
            issuerCountryCode: String,
            kid: String,
            region: String = ""
        ):ExternalParameter{
            return ExternalParameter(
                validationClock = DateTimeFormatter.ISO_OFFSET_DATE_TIME.format(validationClock),
                valueSets = valueSets,
                countryCode = countryCode,
                exp = exp.withZoneSameInstant(UTC_ZONE_ID).toLocalDate().toString(),
                iat = iat.withZoneSameInstant(UTC_ZONE_ID).toLocalDate().toString(),
                issuerCountryCode = issuerCountryCode,
                kid = kid,
                region = region
            )
        }
    }
}

And create it over factory. The problem was that it did not find the constructor, it tried to look for the constructor with ZonedDateTime and in fact, during the de-sugaring process, it was replaced with Date. Although... I can't now repeat this issue on a device with API level 25, and Android 7.1 right now.

Also has problem with:
@dimen/default_padding
It request level 28, so it need remove....