Fatal Exception Main Android Null Pointer Exception

Question

У меня возникла проблема с этим приложением погоды, которое я делаю с TreeHouse. Я задал вопрос на их форумах, но безуспешно.

Вот мои два файла в вопросе ...

MainActivity

package com.megliosolutions.stormy; 

import android.content.Context; 
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.widget.ImageView; 
import android.widget.TextView; 

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; 

import butterknife.ButterKnife; 
import butterknife.InjectView; 


public class MainActivity extends ActionBarActivity { 

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

private CurrentWeather mCurrentWeather; 
@InjectView(R.id.timeLabel) TextView mTimeLabel; 
@InjectView(R.id.temperatureLabel) TextView mTemperatureLabel; 
@InjectView(R.id.humidityValue) TextView mHumidityValue; 
@InjectView(R.id.precipValue) TextView mPrecipValue; 
@InjectView(R.id.summaryLabel) TextView mSummaryLabel; 
@InjectView(R.id.iconImageView) ImageView mIconImageView; 

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

    String APIkey = "baab1393443251119f2e1e8fdf55f46d"; 
    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(); 
        Log.v(TAG, jsonData); 
        if (response.isSuccessful()) { 

         mCurrentWeather = getCurrentDetails(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, "JSON Exception caught: ", e); 
       } 
      } 
     }); 
    } 
    else { 
     // Toast.makeText(this, getString(R.string.network_unavailable_message) 
     //  , Toast.LENGTH_LONG).show(); 

     alertUserNoNetwork(); 
    } 

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

} 

private void updateDisplay() { 
    mTemperatureLabel.setText(mCurrentWeather.getTemperature() + ""); 
    mTimeLabel.setText("At " + mCurrentWeather.getFormattedTime() + " it will be"); 
    mHumidityValue.setText(mCurrentWeather.getHumidity() + ""); 
    mPrecipValue.setText(mCurrentWeather.getPrecipChance() + "%"); 
    mSummaryLabel.setText(mCurrentWeather.getSummary()); 
    Drawable drawable = getResources().getDrawable(mCurrentWeather.getIconId()); 
    mIconImageView.setImageDrawable(drawable); 


} 


private CurrentWeather getCurrentDetails(String jsonData) throws JSONException { 
    JSONObject forecast = new JSONObject(jsonData); 
    String timezone = forecast.getString("timezone"); 
    Log.i(TAG, "From JSON: " + timezone); 

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

    CurrentWeather currentWeather = new CurrentWeather(); 
    currentWeather.setHumidity(currently.getDouble("humidity")); 
    currentWeather.setTime(currently.getLong("time")); 
    currentWeather.setIcon(currently.getString("icon")); 
    currentWeather.setPrecipChance(currently.getDouble("precipProbability")); 
    currentWeather.setSummary(currently.getString("summary")); 
    currentWeather.setTemperature(currently.getDouble("temperature")); 
    currentWeather.setTimeZone(timezone); 

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


    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 alertUserNoNetwork() { 
    NoNetworkAlertDialogFragment NoNetworkdialog = new NoNetworkAlertDialogFragment(); 
    NoNetworkdialog.show(getFragmentManager(), "no_network_dialog"); 
} 

private void alertUserAboutError() { 
    AlertDialogFragment dialog = new AlertDialogFragment(); 
    dialog.show(getFragmentManager(), "error_dialog"); 
} 


} 

Вот CurrentWeather.java

package com.megliosolutions.stormy; 

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

/** 
    * Created by Jarvis on 6/10/15. 
    */ 
    public class CurrentWeather { 

    private String mIcon; 
    private long mTime; 
    private double mTemperature; 
    private double mHumidity; 
    private double mPrecipChance; 
    private String mSummary; 
    private String mTimeZone; 

    public String getTimeZone() { 
    return mTimeZone; 
    } 

    public void setTimeZone(String timeZone) { 
    mTimeZone = timeZone; 
    } 

    public String getFormattedTime(){ 
    SimpleDateFormat formatter = new SimpleDateFormat("h:mm a"); 
    formatter.setTimeZone(TimeZone.getTimeZone(getTimeZone())); 
    Date dateTime = new Date(getTime() * 1000); 
    String timeString = formatter.format(dateTime); 
    return timeString; 
    } 

    public String getIcon() { 
    return mIcon; 
    } 

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

    public int getIconId(){ 
    // clear-day, clear-night, rain, snow, sleet, wind, fog, cloudy,   partly-cloudy-day, or partly-cloudy-night 
    int iconId = R.drawable.clear_day; 
    if (mIcon.equals("clear-day")) { 
     iconId = R.drawable.clear_day; 
    } 
    else if (mIcon.equals("clear-night")) { 
     iconId = R.drawable.clear_night; 
    } 
    else if (mIcon.equals("rain")) { 
     iconId = R.drawable.rain; 
    } 
    else if (mIcon.equals("snow")) { 
     iconId = R.drawable.snow; 
    } 
    else if (mIcon.equals("sleet")) { 
     iconId = R.drawable.sleet; 
    } 
    else if (mIcon.equals("wind")) { 
     iconId = R.drawable.wind; 
    } 
    else if (mIcon.equals("fog")) { 
     iconId = R.drawable.fog; 
    } 
    else if (mIcon.equals("cloudy")) { 
     iconId = R.drawable.cloudy; 
    } 
    else if (mIcon.equals("partly-cloudy-day")) { 
     iconId = R.drawable.partly_cloudy; 
    } 
    else if (mIcon.equals("partly-cloudy-night")) { 
     iconId = R.drawable.cloudy_night; 
    } 

    return iconId; 
    } 

    public long getTime() { 
    return mTime; 
    } 

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

    public int getTemperature() { 
    //returns long value so either turn to long or cast int 
    return (int)Math.round(mTemperature); 
    } 

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

    public double getHumidity() { 
    return mHumidity; 
    } 

    public void setHumidity(double humidity) { 
    mHumidity = humidity; 
    } 

    public int getPrecipChance() { 
    double precipPercentage = mPrecipChance * 100; 

    return (int)Math.round(precipPercentage); 
    } 

    public void setPrecipChance(double precipChance) { 
    mPrecipChance = precipChance; 
    } 

    public String getSummary() { 
    return mSummary; 
    } 

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

Имея проблемы с Null исключение указателя

06-17 00:30:14.013 6766-6766/com.megliosolutions.stormy E/AndroidRuntime﹕ FATAL EXCEPTION: main 
    Process: com.megliosolutions.stormy, PID: 6766 
    java.lang.NullPointerException: id == null 
      at java.util.TimeZone.getTimeZone(TimeZone.java:349) 
      at com.megliosolutions.stormy.CurrentWeather.getFormattedTime(CurrentWeather.java:30) 
      at com.megliosolutions.stormy.MainActivity.updateDisplay(MainActivity.java:108) 
      at com.megliosolutions.stormy.MainActivity.access$200(MainActivity.java:28) 
      at com.megliosolutions.stormy.MainActivity$1$1.run(MainActivity.java:77) 
      at android.os.Handler.handleCallback(Handler.java:739) 
      at android.os.Handler.dispatchMessage(Handler.java:95) 
      at android.os.Looper.loop(Looper.java:135) 
      at android.app.ActivityThread.main(ActivityThread.java:5254) 
      at java.lang.reflect.Method.invoke(Native Method) 
      at java.lang.reflect.Method.invoke(Method.java:372) 
      at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903) 
      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698) 

Над ошибкой я получаю. Не знаете, с чего начать.

Любая помощь ??

Answer 1

Ошибка в этой функции

public String getTimeZone() { 
    return mTimeZone; 
} 

mTimeZone переменных в возвращении null, и таким образом, следующий код рейзер исключение:

TimeZone.getTimeZone(getTimeZone()) 

Кроме того, в этой функции:

private CurrentWeather getCurrentDetails(String jsonData) throws JSONException { 
    JSONObject forecast = new JSONObject(jsonData); 
    String timezone = forecast.getString("timezone"); 
    Log.i(TAG, "From JSON: " + timezone); 

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

    CurrentWeather currentWeather = new CurrentWeather(); 
    currentWeather.setHumidity(currently.getDouble("humidity")); 
    currentWeather.setTime(currently.getLong("time")); 
    currentWeather.setIcon(currently.getString("icon")); 
    currentWeather.setPrecipChance(currently.getDouble("precipProbability")); 
    currentWeather.setSummary(currently.getString("summary")); 
    currentWeather.setTemperature(currently.getDouble("temperature")); 
    currentWeather.setTimeZone(timezone); 

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


    return new CurrentWeather(); 

} 

Вы возвращаете new CurrentWeather() ob ект. Измените его на:

return currentWeather;