How to parse JSON data in weather app

// How to parse JSON data in weather app
//passing in JSON data key "timezone"
//--------------------------------------------------------------
MainActivity.java

package com.teamtreehouse.stormy;

import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.util.Log;
import android.widget.Toast;

import com.squareup.okhttp.Call;
import com.squareup.okhttp.Callback;
import com.squareup.okhttp.OkHttpClient;
import com.squareup.okhttp.Request;
import com.squareup.okhttp.Response;

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

import java.io.IOException;


public class MainActivity extends ActionBarActivity {

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

    private CurrentWeather mCurrentWeather; // CurrentWeather.java

    //create new method to check for network connectivity

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

        String apiKey = "d5faf0cb201f103df4dde0b8b0a4f490";
        double latitude = 37.8267;
        double longitude = -122.423;
        String forecastUrl = "https://api.forecast.io/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(Request request, IOException e) {

                }

                @Override
                public void onResponse(Response response) throws IOException {
                    try {
                        String jsonData = response.body().string(); //pass in Json Data as string*
                        Log.v(TAG,jsonData ); // pass in (jsonData)*
                        if (response.isSuccessful()) {
                            mCurrentWeather = getCurrentDetails(jsonData); //if response is successful, set current weather  //(jsonData)* //[2]
                        } else {
                            alertUserAboutError();
                        }
                    }
                    catch (IOException e) {
                        Log.e(TAG, "Exception caught: ", e);
                    }
                    catch (JSONException e){ //[2]
                        Log.e(TAG, "Exception caught: ", e);
                    }
                }
            });
        }
            else {
                Toast.makeText(this, getString(R.string.network_unavailable_message), Toast.LENGTH_LONG).show();
        }

        Log.d(TAG, "Main UI code is running!");
    }

    private CurrentWeather getCurrentDetails(String jsonData) throws JSONException { //this throws technique for handling exception is basically moving the responsibility of handling the exception to whomever calls this method[2]

        // We're gonna work with a special class called jsonObject. //JSONObject is a public method
        // This class can hold any object represented in the json format, and its properties can be accessed using a few different methods.
        JSONObject forecast = new JSONObject(jsonData); // The json object class has a constructor lets us pass in a string of jsonData to create a new JSON object

        // Access timezone info from JSON API https://api.forecast.io/forecast/d5faf0cb201f103df4dde0b8b0a4f490/37.8267,-122.423
        String timezone = forecast.getString("timezone"); // pass in key from JSON: "timezone"
            Log.i(TAG, "From JSON: " + timezone); // ^ log this

        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_dialog");
    }
}

// https://teamtreehouse.com/library/build-a-weather-app/working-with-json/introducing-jsonobject   ?