A function (Using RxJava) to check network availability and be notifed when it's status changes.

CheckNetwork.kt

//Check network with RxJava2

@SuppressLint("MissingPermission") // AccessNetworkState -> Add it yourself
fun isInternetOn(context: Context): Observable<Boolean> {
    val connectivityManager = context.getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager
    val activeNetworkInfo: NetworkInfo?
    activeNetworkInfo = connectivityManager.activeNetworkInfo
    return Observable.just(activeNetworkInfo != null && activeNetworkInfo.isConnected)
      .map { it }
      .distinctUntilChanged()
}

// Simply subscribe the function in order to use.
// If network CHANGES you will be notified!