gistfile1.txt

class ActivityHome : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        val transport = NetHttpTransport()
        val jsonFactory = JacksonFactory.getDefaultInstance()
        val request = YouTubeRequestInitializer("my-youtube-api-key-3")

        val service = YouTube.Builder(
            transport, jsonFactory, HttpRequestInitializer { request ->
            val packageName = packageName
            val SHA1 = getSHA1(packageName)

            request.headers.set("X-Android-Package", packageName)
            request.headers.set("X-Android-Cert", SHA1)
        })
            .setYouTubeRequestInitializer(request)
            .setApplicationName("Tube")
            .build()

        launch {
            val response = service
                .search()
                .list("snippet,id")
                .setMaxResults(50)
                .set("channelId", "UCT67YOMntJxfRnO_9bXDpvw")
                .setOrder("date")
                .execute()
            
            System.out.println(response)
        }

    }

    private fun getSHA1(packageName: String): String? {
        try {
            val signatures = packageManager.getPackageInfo(packageName, PackageManager.GET_SIGNATURES).signatures
            for (signature in signatures) {
                val md: MessageDigest = MessageDigest.getInstance("SHA-1")
                md.update(signature.toByteArray())
                return BaseEncoding.base16().encode(md.digest())
            }
        } catch (e: PackageManager.NameNotFoundException) {
            e.printStackTrace()
        } catch (e: NoSuchAlgorithmException) {
            e.printStackTrace()
        }

        return null
    }
}