null pointer exeption

package james.stormy.weather;

import android.os.Parcel;
import android.os.Parcelable;

import java.text.SimpleDateFormat;
import java.util.Date;

public class Hour implements Parcelable{
    private long mTime;
    private String mSummary;
    private double mTemperature;
    private String mIcon;
    private String mTimezone;

    public Hour() {}

    public long getTime() {
        return mTime;
    }

    public void setTime(long time) {
        mTime = time;
    }

    public String getSummary() {
        return mSummary;
    }

    public void setSummary(String summary) {
        mSummary = summary;
    }

    public int getTemperature() {
        return (int) Math.round(mTemperature);
    }

    public void setTemperature(double temperature) {
        mTemperature = temperature;
    }

    public String getIcon() {
        return mIcon;
    }

    public int getIconId() {
        return Forecast.getIconId(mIcon);

    }

    public void setIcon(String icon) {
        mIcon = icon;
    }

    public String getTimezone() {
        return mTimezone;
    }

    public void setTimezone(String timezone) {
        mTimezone = timezone;
    }

    public String getHour() {
        SimpleDateFormat formatter = new SimpleDateFormat("h a");
        Date date = new Date(mTime * 1000);
        return formatter.format(date);

    }

    @Override
    public int describeContents() {
        return 0; // ignor
    }

    @Override
    public void writeToParcel(Parcel dest, int flags) {
        dest.writeLong(mTime);
        dest.writeDouble(mTemperature);
        dest.writeString(mSummary);
        dest.writeString(mIcon);
        dest.writeString(mTimezone);

    }
    private Hour(Parcel in) {
        mTime = in.readLong();
        mTemperature = in.readDouble();
        mSummary = in.readString();
        mIcon = in.readString();
        mTimezone = in.readString();

    }
    public static final Creator<Hour> CREATOR = new Creator<Hour>() {
        @Override
        public Hour createFromParcel(Parcel source) {
            return new Hour(source);
        }

        @Override
        public Hour[] newArray(int size) {
            return new Hour[size];
        }
    };
}

package james.stormy.UI;

import android.content.Context;
import android.content.Intent;
import android.graphics.drawable.Drawable;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.util.Log;
import android.view.View;
import android.widget.ImageView;
import android.widget.ProgressBar;
import android.widget.TextView;
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.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import java.io.IOException;

import butterknife.ButterKnife;
import butterknife.InjectView;
import butterknife.OnClick;
import james.stormy.R;
import james.stormy.weather.Current;
import james.stormy.weather.Day;
import james.stormy.weather.Hour;
import james.stormy.weather.Forecast;


public class MainActivity extends ActionBarActivity {

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

    private Forecast mForecast;
    @InjectView(R.id.time_label) TextView mTimeLabel;
    @InjectView(R.id.TempLabel) TextView mTemperatureLabel;
    @InjectView(R.id.hum_value) TextView mHumidityValue;
    @InjectView(R.id.PRECIP_VALUE) TextView mPrecipValue;
    @InjectView(R.id.summaryLabel) TextView mSummaryLabel;
    @InjectView(R.id.icon_image_view) ImageView mIconImageView;
    @InjectView(R.id.progressBar) ProgressBar mProgressBar;
    @InjectView(R.id.location_view) TextView mLocationLabel;
    @InjectView(R.id.refreshImageView) ImageView mRefreshButton;




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

        mProgressBar.setVisibility(View.INVISIBLE);



        final double latitude = 42.683333;
        final double longitude = -81.797222;

        mRefreshButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                getForecast(latitude, longitude);
            }
        });

        getForecast(latitude,longitude);
        Log.d(TAG,"Main UI is running!");

    }



    private void getForecast(double lat, double Long) {
        mSummaryLabel.setText("Getting Current Weather...");
        String apiKey = "b964c75d003c3f8b1a737880cb6deabb";


        String forecastUrl = "https://api.forecast.io/forecast/"+apiKey+"/"+lat+","+Long;
        if (isNetworkAvailable()) {
            toggleRefresh();
            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)  {
                    runOnUiThread(new Runnable() {
                        @Override
                        public void run() {
                            toggleRefresh();
                            AlertUserAboutError();

                        }
                    });


                }

                @Override
                public void onResponse(Response response) throws IOException {
                    runOnUiThread(new Runnable() {
                        @Override
                        public void run() {
                            toggleRefresh();
                        }
                    });
                    try {
                        String jsonData = response.body().string();
                        Log.v(TAG, jsonData);

                        if (response.isSuccessful()) {
                            mForecast = parseForecastDetails(jsonData);
                            runOnUiThread(new Runnable() {
                                @Override
                                public void run() {

                                    updateDisplay();


                                }
                            });
                        } else {
                            AlertUserAboutError();


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

                    }
                    catch (JSONException e ) {

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

                }


            });
        } else {

            mSummaryLabel.setText(getString(R.string.error_message_simplified));
            Toast.makeText(this, getString(R.string.network_unavailable_message), Toast.LENGTH_LONG).show();
        }
    }

    private void toggleRefresh() {
        if (mProgressBar.getVisibility()==View.VISIBLE) {
        mProgressBar.setVisibility(View.INVISIBLE);
        mRefreshButton.setVisibility(View.VISIBLE);
        }
        else {
            mProgressBar.setVisibility(View.VISIBLE);
            mRefreshButton.setVisibility(View.INVISIBLE);
        }
    }

    private void updateDisplay() {
        Current current = mForecast.getCurrent();
        mTemperatureLabel.setText(current.getTemp() + "");


        mTimeLabel.setText("At "+ current.getFormattedTime()+ " it will be");
        mHumidityValue.setText(current.getHum() + "");
        mPrecipValue.setText(current.getPrecipChance()+"%");
        mSummaryLabel.setText(current.getSummary());
        Drawable drawable = getResources().getDrawable(current.getIconId());
        mIconImageView.setImageDrawable(drawable);
        mLocationLabel.setText(current.getTimeZone());

    }

    private Forecast parseForecastDetails(String jsonData) throws JSONException{
        Forecast Forecast = new Forecast();

            Forecast.setCurrent(getCurrentDetails(jsonData));
            Forecast.setHourlyForecast(getHourlyForecast(jsonData));
            Forecast.setDailyForcast(getDailyForecast(jsonData));

        return Forecast;
    }

    private Day[] getDailyForecast(String jsonData) throws JSONException{
        JSONObject forecast = new JSONObject(jsonData);
        String timeZone = forecast.getString("timezone");
        JSONObject daily = forecast.getJSONObject("daily");
        JSONArray data = daily.getJSONArray("data");

        Day[] days = new Day[data.length()];
        for (int i = 0; i < data.length(); i++){
            JSONObject jsonDay = data.getJSONObject(i);
            Day day = new Day();

            day.setSummary(jsonDay.getString("summary"));
            day.setIcon(jsonDay.getString("icon"));
            day.setTempMax(jsonDay.getDouble("temperatureMax"));
            day.setTime(jsonDay.getLong("time"));
            day.setTimeZone(timeZone);

            days[i] = day;
        }

        return days;
    }

    private Hour[] getHourlyForecast(String jsonData) throws JSONException{
        JSONObject forecast = new JSONObject(jsonData);
        String timeZone = forecast.getString("timezone");
        JSONObject hourly = forecast.getJSONObject("hourly");
        JSONArray data = hourly.getJSONArray("data");

        Hour[] hours = new Hour[data.length()];

        for (int i = 0; i < data.length(); i++) {
            JSONObject jsonHour = data.getJSONObject(i);
            Hour hour = new Hour();
            hour.setSummary(jsonHour.getString("summary"));
            hour.setTemperature(jsonHour.getDouble("temperature"));
            hour.setIcon(jsonHour.getString("icon"));
            hour.setTime(jsonHour.getLong("time"));
            hour.setTimezone(timeZone);

            hours[i] = hour;
        }
        return hours;
    }

    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() {
        mSummaryLabel.setText(getString(R.string.error_message_simplified));
        AlertDialogFragment dialog = new AlertDialogFragment();
        dialog.show(getFragmentManager(),"error_dialog");
    }
    private Current getCurrentDetails(String data) throws JSONException{
        JSONObject forecast = new JSONObject(data);
        String timeZone = forecast.getString("timezone");
        Log.i(TAG,"From JSON:" + timeZone);

        JSONObject currently = forecast.getJSONObject("currently");

        Current current = new Current();
        current.setHum(currently.getDouble("humidity"));
        current.setTime(currently.getLong("time"));
        current.setIcon(currently.getString("icon"));
        current.setPrecipChance(currently.getDouble("precipProbability"));
        current.setSummary(currently.getString("summary"));
        current.setTemp(currently.getDouble("temperature"));
        current.setTimeZone(timeZone);

        Log.d(TAG, current.getFormattedTime());

        return current;
    }

    @OnClick (R.id.dailyButton)
    public void startDailyActivity(View view) {
        Intent intent = new Intent(this, DailyForecastActivity.class);
        intent.putExtra(DAILY_FORECAST, mForecast.getDailyForcast());
        startActivity(intent);
    }
    @OnClick (R.id.hourlyButton)
    public  void  startHourlyActivity(View view) {
        Intent intent = new Intent(this, HourlyForecastActivity.class);
        intent.putExtra(HOURLY_FORECAST, mForecast.getHourlyForecast());
        startActivity(intent);
    }


}