Low Android Internet Connection Issue

I am creating an Android application that checks my internet connection. I want to display a toast message when my internet connection is very slow. Or when the server does not respond to the request. In this case, I want to put a toast as Connection is slow !. Here, in my code, I found whether the Internet is connected or not, but I don’t know how to toast messages about Internet slow ...

public boolean isConnectingToInternet(){
    ConnectivityManager connectivity = (ConnectivityManager) _context.getSystemService(Context.CONNECTIVITY_SERVICE);
      if (connectivity != null) 
      {
          NetworkInfo[] info = connectivity.getAllNetworkInfo();
          if (info != null) 
              for (int i = 0; i < info.length; i++) 
                  if (info[i].getState() == NetworkInfo.State.CONNECTED)
                  {
                      return true;
                  }

      }
      return false;
}