UserData field in Blockstack Android SDK

Apps
#1

I’m trying to use the codes in Blockstack Android SDK tutorial and example projects there in my app. But, the problem is the field “UserData” remains null when I run my app and sign-in using Blockstack. I couldn’t understand what the problem can be. I’m also sharing my code below:

import android.support.v7.app.AppCompatActivity
import android.os.Bundle

import android.content.Intent
import android.view.View
import android.widget.Toast
import android.util.Log
import kotlinx.android.synthetic.main.blockstack_activity.*
import org.blockstack.android.sdk.BlockstackSession
import org.blockstack.android.sdk.BlockstackConfig
import org.blockstack.android.sdk.Scope
import org.blockstack.android.sdk.UserData
import java.net.URI

class BlockstackActivity : AppCompatActivity() {

private var _blockstackSession: BlockstackSession? = null
private val TAG = BlockstackActivity::class.java.simpleName

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.blockstack_activity)

    signInButton.isEnabled = false

    val config = java.net.URI("https://flamboyant-darwin-d11c17.netlify.com").run {
        BlockstackConfig(
                this,
                URI("${this}/redirect"),
                URI("${this}/manifest.json"),
                kotlin.arrayOf(Scope.StoreWrite))
    }

    _blockstackSession = BlockstackSession(this, config,
            onLoadedCallback = {
                // Wait until this callback fires before using any of the
                // BlockstackSession API methods

                if (intent?.action == Intent.ACTION_VIEW) {
                    handleAuthResponse(intent)
                }
                onLoaded()
            })

    signInButton.setOnClickListener { _: View ->
        blockstackSession().redirectUserToSignIn { userDataResult ->
            if (userDataResult.hasValue) {
                Log.d(TAG, "signed in!")
                runOnUiThread {
                    onSignIn(userDataResult.value!!)
                }
            } else {
                Toast.makeText(this, "error: " + userDataResult.error, Toast.LENGTH_SHORT).show()
            }
        }
    }
}

private fun onLoaded() {
    signInButton.isEnabled = true
    blockstackSession().isUserSignedIn { signedIn ->
        if (signedIn) {
            signInButton.visibility = View.GONE
        } else {
            signInButton.visibility = View.VISIBLE
        }
    }
}

private fun onSignIn(userData: UserData) {
    userDataTextView.text = "Signed in as ${userData.decentralizedID}"
    signInButton.isEnabled = false
    var nextIntent: Intent? = Intent(this@BlockstackActivity, NextActivity::class.java)

    if (nextIntent == null) {
        nextIntent = Intent(this@BlockstackActivity, NextActivity::class.java)
    }

    startActivity(nextIntent)
    finish()
}

override fun onNewIntent(intent: Intent?) {
    super.onNewIntent(intent)

    if (intent?.action == Intent.ACTION_VIEW) {
        handleAuthResponse(intent)
    }
}

private fun handleAuthResponse(intent: Intent) {
    val response = intent.dataString
    if (response != null) {
        val authResponseTokens = response.split(':')

        if (authResponseTokens.size > 1) {
            val authResponse = authResponseTokens[1]

            blockstackSession().handlePendingSignIn(authResponse, { userData ->
                if (userData.hasValue) {
                    // The user is now signed in!
                    runOnUiThread {
                        onSignIn(userData.value!!)
                    }
                }
            })
        }
    }
}

fun blockstackSession(): BlockstackSession {
    val session = _blockstackSession
    if (session != null) {
        return session
    } else {
        throw IllegalStateException("No session.")
    }
}


}

Is the problem about my Blockstack account or my code? Thanks in advance.