android actviity模糊,parse server - ParseServer LiveQuery not working on Android - Stack Overflow

I setup ParseServer and Android SDK successfully and I can send and retrieve Objects to and from my database. Now I want to use LiveQuery, I integrated the SDK and followed the tutorial (https://github.com/parse-community/ParseLiveQuery-Android), but somehow it is not working. Can someone help me find the error?

MainActviity:

import android.os.Bundle

import android.widget.Toast

import androidx.appcompat.app.AppCompatActivity

import com.parse.Parse

import com.parse.ParseObject

import com.parse.ParseQuery

import com.parse.livequery.ParseLiveQueryClient

import com.parse.livequery.SubscriptionHandling

import kotlinx.android.synthetic.main.activity_main.*

class MainActivity : AppCompatActivity() {

override fun onCreate(savedInstanceState: Bundle?) {

super.onCreate(savedInstanceState)

setContentView(R.layout.activity_main)

Parse.initialize(Parse.Configuration.Builder(this)

.applicationId("myId")

.server("http://192.168.178.84:1337/parse/")

.build())

// Build Live Query Client

val parseLiveQueryClient = ParseLiveQueryClient.Factory.getClient()

// Build Query

val parseQuery = ParseQuery.getQuery("GameScore")

// Build Live Query Listener

val subscriptionHandling: SubscriptionHandling = parseLiveQueryClient.subscribe(parseQuery)

subscriptionHandling.handleSubscribe {

Toast.makeText(this, "Subscribed", Toast.LENGTH_LONG).show()

}

subscriptionHandling.handleEvents { query, event, data ->

print(event)

}

subscriptionHandling.handleError { query, exception ->

print(exception)

}

/*

This is working fine, means the app can connect to my server

*/

getData.setOnClickListener {

val query = ParseQuery.getQuery("GameScore")

query.getInBackground(

"U8E8PFI7RG"

) { data, e ->

if (e == null) {

textViewName.text = data.getString("playerName")

textViewScore.text = data.getInt("score").toString()

textViewCheatMode.text = data.objectId.toString()

} else {

print(e)

}

}

}

}

}

build.gradle (app) - dependencies

dependencies {

implementation fileTree(dir: "libs", include: ["*.jar"])

implementation "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"

implementation 'androidx.core:core-ktx:1.3.2'

implementation 'androidx.appcompat:appcompat:1.2.0'

implementation 'androidx.constraintlayout:constraintlayout:2.0.2'

testImplementation 'junit:junit:4.12'

androidTestImplementation 'androidx.test.ext:junit:1.1.2'

androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0'

// Parse Server

implementation "com.github.parse-community.Parse-SDK-Android:parse:1.25.0"

// Parse Server Live Query

implementation 'com.github.parse-community:ParseLiveQuery-Android:1.2.2'

}

neither the toast is displayed nor the other events of subscribtionHandling react

EDIT: I installed parse-server and parse-dashboard along with mongodb on Ubuntu 18.04 and using Android Studio as my Client to connect via app to the database