How to check if APK is signed or “debug build”?

Question

As far as I know, in android \"release build\" is signed APK. How to check it from code or does Eclipse has some kinda of secret defines?

I need thi

Answer 1

Solution in Kotlin that I'm using at the moment:

@SuppressLint("PackageManagerGetSignatures")
@Suppress("DEPRECATION")
fun isSigned(context: Context?): Boolean {
    return (context?.packageManager?.getPackageInfo(context.packageName, PackageManager.GET_SIGNATURES)?.signatures?.firstOrNull()?.toByteArray()
            ?.let {
                return@let CertificateFactory.getInstance("X.509").generateCertificate(ByteArrayInputStream(it))
            } as? X509Certificate)
            ?.issuerDN
            ?.name
            ?.contains("O=Android", ignoreCase = false) ?: true
}

that way I can still SIGN in debug and those will be reported to Crashlytics (example, for the QA process)