Cannot find log statement.Also made a toast to display timezone.(Didnt work)

package com.example.aritrobanerjee93.stormy;

import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.nfc.Tag;
import android.nfc.TagLostException;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.widget.Toast;

import org.json.JSONException;
import org.json.JSONObject;

import java.io.IOException;

import okhttp3.Call;
import okhttp3.Callback;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;

public class MainActivity extends AppCompatActivity {

    private static final String TAG = MainActivity.class.getSimpleName();

    private CurrentWeather mCurrentWeather;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        String apiKey="0f6f530003b63e31a5c9f11669711b8c";
        double latitude=37.8267;
        double longitude=-122.4233;
        String forecastUrl="https://api.darksky.net/forecast/"+apiKey+"/" +latitude+","+longitude;

        if(isNetworkAvailable()) {


            OkHttpClient client = new OkHttpClient();
            Request request = new Request.Builder()
                    .url(forecastUrl).
                            build();

            Call call = client.newCall(request);
            call.enqueue(new Callback() {
                @Override
                public void onFailure(Call call, IOException e) {

                }

                @Override
                public void onResponse(Call call, Response response) throws IOException {

                    try {
                        String jsonData=response.body().string();
                        //Response response =call.execute(); This is the synchronous call method!
                        Log.v(TAG,jsonData );
                        if (response.isSuccessful()) {
                            mCurrentWeather = getCurrentDetails(jsonData);

                        } else {
                            alertUserAboutError();
                        }
                    }
                    catch (IOException e) {
                        Log.e(TAG, "Exception caught: ", e);

                    }
                    catch(JSONException e){

                        Log.e(TAG, "Exception caught: ", e);
                    }
                }
            });

        }

        else{

            Toast.makeText(this, R.string.network_unavailable_message,Toast.LENGTH_LONG).show();
        }
        Log.d(TAG,"Main UI code is running!");




    }

    private CurrentWeather getCurrentDetails(String jsonData)throws JSONException {
        JSONObject forecast = new JSONObject(jsonData);
        String timezone = forecast.getString("timezone");
        Log.i(TAG,"From JSON: "+ timezone);
        Toast.makeText(this,"Timezone is :" + timezone,Toast.LENGTH_LONG).show();

        return new CurrentWeather();
    }

    private boolean isNetworkAvailable() {

        ConnectivityManager manager = (ConnectivityManager)
                getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo networkInfo = manager.getActiveNetworkInfo();
        boolean isAvailable = false;
        if(networkInfo != null && networkInfo.isConnected()){
            isAvailable = true;
        }
        return isAvailable;
    }

    private void alertUserAboutError() {

        AlertDialogFragment dialog = new AlertDialogFragment();
        dialog.show(getFragmentManager(),"error_dialogue");
    }
}