Connection Check on Android - Available in 3 state - Disconnected, Connected (no internet), Connected (with internet)

ConnectionService.kt

import android.content.Context
import android.net.ConnectivityManager
import java.net.InetAddress
import java.net.UnknownHostException

class ConnectionService(context: Context) {

    companion object {

        private var mInstance: ConnectionService? = null

        @Synchronized
        fun instance(context: Context): ConnectionService {
            if (mInstance == null) {
                mInstance = ConnectionService(context)
            }
            return mInstance as ConnectionService
        }

    }

    private val mConnectivityManager =
            context.getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager

    fun getConnectionState(hostname: String = "google.com"): ConnectionState {
        val activeNetInfo = mConnectivityManager.activeNetworkInfo
        if (activeNetInfo != null && activeNetInfo.isConnected) {
            val wifiConnected = ConnectionState.WifiConnected(activeNetInfo)
            try {
                val ipAddr = InetAddress.getByName(hostname)
                if (!ipAddr.equals("")) {
                    return ConnectionState.InternetConnected(wifiConnected)
                }
                return ConnectionState.InternetDisconnected(wifiConnected)
            } catch (e: UnknownHostException) {
                return ConnectionState.InternetDisconnected(wifiConnected)
            }
        } else {
            return ConnectionState.WifiDisconnected(activeNetInfo)
        }
    }

}

ConnectionState.kt

import android.net.NetworkInfo

sealed class ConnectionState {

    data class WifiConnected(val activeNetworkInfo: NetworkInfo) : ConnectionState()
    data class WifiDisconnected(val activeNetworkInfo: NetworkInfo) : ConnectionState()
    data class InternetConnected(val wifiConnected: WifiConnected) : ConnectionState()
    data class InternetDisconnected(val wifiConnected: WifiConnected) : ConnectionState()

}

This snippets are unused anymore. You can simply use mConnectivityManager.isDefaultNetworkActive to check internet connectivity