運行時錯誤

-1

主要代碼：

package com.example.m.i.f.projectsandroidtestapp; 


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

    import org.json.JSONException; 
    import org.json.JSONObject; 
    import android.widget.GridView; 
    import android.os.AsyncTask; 
    import android.os.Bundle; 
    import android.os.Parcelable; 
    import android.support.v4.app.FragmentActivity; 
    import android.support.v4.view.ViewPager; 
    import android.util.Log; 
    import android.view.LayoutInflater; 
    import android.view.View; 
    import android.view.ViewGroup; 
    import android.view.View.OnClickListener; 
    import android.widget.Button; 
    import android.widget.TextView; 
    import com.actionbarsherlock.app.SherlockFragment; 
    import com.directionalviewpager.DirectionalViewPager; 
    import com.example.m.i.f.projectsandroidtestapp.WeatherHttpClient; 
    import com.example.m.i.f.projectsandroidtestapp.adapter.DailyForecastPageAdapter; 
    import com.example.m.i.f.projectsandroidtestapp.fragment.DayForecastFragment; 
    import com.example.m.i.f.projectsandroidtestapp.model.Weather; 
    import com.example.m.i.f.projectsandroidtestapp.model.WeatherForecast; 


public class ForecastWeatherActivity extends SherlockFragment { 
Parcelable state; 
TextView cityText; 
TextView condDescr; 
TextView temp; 
TextView press; 
TextView windSpeed; 
TextView minmaxTempNow; 
TextView hum; 
TextView textTemp; 
TextView textHum; 
TextView textPress; 
TextView textWind; 
TextView date; 
Button Update; 
String dateSt; 
GridView GridV; 
String humidT; 
String cityT; 
String tempT; 
String descrT; 
String mmT; 
String windT; 
String pressT; 
public JSONWeatherTask mt; 
public JSONForecastWeatherTask ft; 
JSONWeatherTask task; 
JSONForecastWeatherTask task1; 
WeatherForecast forecast; 
Weather weather; 
Bundle bundle; 
final String LOG_TAG = "myLogs"; 
DayForecastFragment fragment1; 
//количесво дней для прогноза 
static String forecastDaysNum = "7"; 
ViewPager pager; 
final String city = "Kirovohrad"; 
final String lang = "en"; 
public View onCreateView(LayoutInflater inflater, ViewGroup container, 
     Bundle savedInstanceState) { 
    // Inflate the layout for this fragment 
    return inflater.inflate(R.layout.weathertab, container, false); 
} 
@Override 
public void onActivityCreated(Bundle savedInstanceState) { 
    super.onActivityCreated(savedInstanceState); 
    //setContentView(R.layout.weathertab); 



    //дата 
    SimpleDateFormat sdf = new SimpleDateFormat("d MMMMMM, EEEEE"); 
    dateSt = sdf.format(new Date());; 
    //подключение элементов 
    date = (TextView) getView().findViewById(R.id.datenow); 
    Update = (Button) getView().findViewById(R.id.update); 
    textWind = (TextView) getView().findViewById(R.id.textWind); 
    textPress = (TextView) getView().findViewById(R.id.textPress); 
    textHum = (TextView) getView().findViewById(R.id.textHum); 
    textTemp = (TextView) getView().findViewById(R.id.textTemp); 
    cityText = (TextView) getView().findViewById(R.id.cityText); 
    temp = (TextView) getView().findViewById(R.id.temp); 
    condDescr = (TextView) getView().findViewById(R.id.skydesc); 
    pager = (ViewPager) getView().findViewById(R.id.pager); 
    minmaxTempNow = (TextView) getView().findViewById(R.id.minmaxTempNow); 
    hum = (TextView) getView().findViewById(R.id.hum); 
    press = (TextView) getView().findViewById(R.id.press); 
    windSpeed = (TextView) getView().findViewById(R.id.windSpeed); 
    //конпка обновить 
    Update.setOnClickListener (new OnClickListener() { 
     public void onClick(View v) { 
      mt = new JSONWeatherTask(); 
      mt.execute(new String[]{city,lang}); 
      ft = new JSONForecastWeatherTask(); 
      ft.execute(new String[]{city,lang, forecastDaysNum}); 
      } 
     }); 
    bundle = new Bundle(); 
    //запуск 
    task = new JSONWeatherTask(); 
    task.execute(new String[]{city,lang}); 

task1 = new JSONForecastWeatherTask(); 
task1.execute(new String[]{city,lang, forecastDaysNum}); 

       } 


//класс погоды 
    private class JSONWeatherTask extends AsyncTask<String, Void, Weather> { 

    @Override 
    protected Weather doInBackground(String... params) { 
     Weather weather = new Weather(); 
     String data = ((new WeatherHttpClient()).getWeatherData(params[0], params[1])); 

     try { 
      weather = JSONWeatherParser.getWeather(data); 
      System.out.println("Weather ["+weather+"]"); 


     } catch (JSONException e) {    
      e.printStackTrace(); 
     } 
     return weather; 

} 


protected void onPostExecute (Weather weather) {    
     super.onPostExecute(weather); 

     //присвоение значений 
     humidT =(" " + weather.currentCondition.getHumidity() + "%"); 
     cityT = (weather.location.getCity()); 
     tempT = ("" + Math.round((weather.temperature.getTemp() - 275.15)) + " C"); 
     descrT = (weather.currentCondition.getCondition() + "(" + weather.currentCondition.getDescr() + ")"); 
     mmT = (" " + Math.round(weather.temperature.getMinTemp() -275.15) + "/" + Math.round(weather.temperature.getMaxTemp() - 275.15)); 
     pressT = (" " + weather.currentCondition.getPressure() + " hPa"); 
     windT = (" " + weather.wind.getSpeed() + " mps"); 
     date.setText(dateSt); 
     textWind.setText("wind: "); 
     textPress.setText("pressure: "); 
     textHum.setText("humidity: "); 
     textTemp.setText("temperature: "); 
     cityText.setText(cityT); 
     temp.setText(tempT); 
     condDescr.setText(descrT); 
     minmaxTempNow.setText(mmT); 
     hum.setText(humidT); 
     press.setText(pressT); 
     windSpeed.setText(windT); 

    } 



    } 

//класс прогноза погоды 
private class JSONForecastWeatherTask extends AsyncTask<String, Void, WeatherForecast> { 

    @Override 
    protected WeatherForecast doInBackground(String... params) { 

     String data = ((new WeatherHttpClient()).getForecastWeatherData(params[0], params[1], params[2])); 
     WeatherForecast forecast = new WeatherForecast(); 
     try { 
      forecast = JSONWeatherParser.getForecastWeather(data); 
      System.out.println("Weather ["+forecast+"]"); 


     } catch (JSONException e) {    
      e.printStackTrace(); 
     } 
     return forecast; 

} 




@Override 
    protected void onPostExecute(WeatherForecast forecastWeather) {   
     super.onPostExecute(forecastWeather); 


     DailyForecastPageAdapter adapter = new DailyForecastPageAdapter(Integer.parseInt(forecastDaysNum), getActivity().getSupportFragmentManager(), forecastWeather); 
     state = adapter.saveState(); 
     adapter.restoreState(state, null); 
     pager.setAdapter(adapter); 
     state = adapter.saveState(); 
    } 



    } 


     }

片段：

package com.example.m.i.f.projectsandroidtestapp.fragment; 

    import com.example.m.i.f.projectsandroidtestapp.R; 
    import com.example.m.i.f.projectsandroidtestapp.model.DayForecast; 
    import android.os.Bundle; 
    import android.support.v4.app.Fragment; 
    import android.view.LayoutInflater; 
    import android.view.View; 
    import android.view.ViewGroup; 
    import android.widget.TextView; 
public class DayForecastFragment extends Fragment { 

String temp; 
String desc; 
DayForecast dayForecast; 
public DayForecastFragment() {} 
public void setForecast(DayForecast dayForecast) { 
    this.dayForecast = dayForecast; 

} 
@Override 

public View onCreateView(LayoutInflater inflater, ViewGroup container, 
     Bundle savedInstanceState) { 
    View v = inflater.inflate(R.layout.dayforecast_fragment, container, false); 
    //задание значений 
    if(savedInstanceState != null) { 
      savedInstanceState.getString("TEMP"); 
     savedInstanceState.getString("DESC"); 
     savedInstanceState.get(getTag()); 
    } 
    TextView tempView = (TextView) v.findViewById(R.id.tempForecast); 
    TextView descView = (TextView) v.findViewById(R.id.skydescForecast); 
    //температура мин/ макс 

    temp = (int) (dayForecast.forecastTemp.min - 275.15) + "/" + (int) (dayForecast.forecastTemp.max - 275.15) + " C" ;//облачность 
    desc = dayForecast.weather.currentCondition.getDescr(); 
    tempView.setText(temp); 
    descView.setText(desc); 
    return v; 
} 
@Override 
public void onSaveInstanceState(Bundle outState) { 
    super.onSaveInstanceState(outState); 
    outState.putString("TEMP", temp); 
    outState.putString("DESC", desc); 
    outState.putAll(outState); 
} 
@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    if(savedInstanceState != null) { 
     savedInstanceState.getString("TEMP"); 
    savedInstanceState.getString("DESC"); 
    savedInstanceState.get(getTag()); 

    } 
      } 


      }

適配器：

package com.example.m.i.f.projectsandroidtestapp.adapter; 
     import java.text.SimpleDateFormat; 
     import java.util.Calendar; 
     import java.util.Date; 
     import java.util.GregorianCalendar; 
     import com.example.m.i.f.projectsandroidtestapp.fragment.DayForecastFragment; 
     import com.example.m.i.f.projectsandroidtestapp.model.DayForecast; 
     import com.example.m.i.f.projectsandroidtestapp.model.WeatherForecast; 
     import android.os.Parcelable; 
    import android.support.v4.app.Fragment; 
    import android.support.v4.app.FragmentManager; 
     import android.support.v4.app.FragmentPagerAdapter; 
     import android.support.v4.app.FragmentStatePagerAdapter; 
    public class DailyForecastPageAdapter extends FragmentStatePagerAdapter { 
int numDays; 
FragmentManager fm; 
WeatherForecast forecast; 
//формат даты 
static SimpleDateFormat sdf = new SimpleDateFormat("E, dd-MM"); 
public DailyForecastPageAdapter(int numDays, FragmentManager fm, WeatherForecast forecast) { 
    super(fm); 
    this.numDays = numDays; 
    this.fm = fm; 
    this.forecast = forecast;  
} 
// заголовок страницы 
public CharSequence getPageTitle(int position) { 
    Date d = new Date(); 
    Calendar gc = new GregorianCalendar(); 
    gc.setTime(d); 
    gc.add(GregorianCalendar.DAY_OF_MONTH, position); 
    return sdf.format(gc.getTime()); 
} 
@Override 
public Fragment getItem(int num) { 
    DayForecast dayForecast = (DayForecast) forecast.getForecast(num); 
    DayForecastFragment f = new DayForecastFragment(); 
    f.setForecast(dayForecast); 
    return f; 
} 
@Override 
public int getCount() { 
    return numDays; 
} 
public void restoreState(Parcelable arg0, ClassLoader arg1){ 
    } 
public Parcelable saveState(){ 
     return null; 
    } 
    }

現在是我的問題屏幕旋轉。我讀了很多關於使用片段來保存狀態的例子，但是不能理解它。當我旋轉屏幕我有錯誤「的應用程序停止」

有logcat的：

10-29 13：52：50.262：W/dalvikvm（1601）：線程ID = 1：螺紋與未捕獲離開異常（group = 0xa629c288） 10-29 13：52：50.286：E/AndroidRuntime（1601）：致命異常：主 10-29 13：52：50.286：E/AndroidRuntime（1601）：java.lang.RuntimeException：無法啓動活動ComponentInfo {com.example.mifprojectsandroidtestapp/com.example.mifprojectsandroidtestapp.MainActivity}：java.lang.NullPointerException 10-29 13:52:50.286：E/AndroidRuntime（1601）：at android.app。 ActivityThread.performLaunchActivity（ActivityThread.java:2059） E：/ AndroidRuntime（1601）：at android.app.ActivityThread.handleLaunchActivity（ActivityThread.java:2084） 10-29 13:52:50.286：E/AndroidRuntime（1601）：at android.app.ActivityThread.handleRelaunchActivity（ActivityThread.java:3512） 10-29 13：52：50.286：E/AndroidRuntime（1601）：at android.app.ActivityThread.access $ 700（ActivityThread.java:130） 10- 29 13：52：50.286：E/AndroidRuntime（1601）：at android.app.ActivityThread $ H.handleMessage（ActivityThread.java:1201） 10-29 13：52：50.286：E/AndroidRuntime（1601）：at android .os.Handler.dispatchMessage（Handler.java:99） 10-29 13：52：50.286：E/AndroidRuntime（1601）：at android.os.Looper.loop（Looper.java:137） 10-29 13 ：52：50.286：E/AndroidRuntime（1601）：在android.app.ActivityThread.main（ActivityThread.java:4745） 10-29 13：52：50.286：E/AndroidRuntime（1601）：at java.lang.reflect.Method.invokeNative（Native Method） 10-29 13：52：50.286：E/AndroidRuntime（1601）：at java .lang.reflect.Method.invoke（Method.java:511） 10-29 13：52：50.286：E/AndroidRuntime（1601）：at com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run（ZygoteInit.java ：786） 10-29 13：52：50.286：E/AndroidRuntime（1601）：at com.android.internal.os.ZygoteInit.main（ZygoteInit.java:553） 10-29 13：52：50.286：E/AndroidRuntime（1601）：在dalvik.system.NativeStart.main（本地方法） 10-29 13：52：50.286：E/AndroidRuntime（1601）：引起：java.lang.NullPointerException 10-29 13:52 ：50.286：E/AndroidRuntime（1601）：at com.example.mifprojectsandroidtestapp.fragment.DayForecastFragment.onCreateView（DayForecastFragment.java:43）E/AndroidRuntime（1601）：at android.support.v4.app.Fragment.performCreateView（Fragment.java:1478） 10-29 13：52：50.286：E/AndroidRuntime 1601）：在android.support.v4.app.FragmentManagerImpl.moveToState（FragmentManager.java:927） 10-29 13：52：50.286：E/AndroidRuntime（1601）：at android.support.v4.app.FragmentManagerImpl。 moveToState（FragmentManager.java:1104） 10-29 13：52：50.286：E/AndroidRuntime（1601）：at android.support.v4.app.FragmentManagerImpl.moveToState（FragmentManager.java:1086） 10-29 13： 52：50.286：E/AndroidRuntime（1601）：在android.support.v4.app.FragmentManagerImpl.dispatchActivityCreated（FragmentManager.java:1877） 10-29 13：52：50.286：E/AndroidRuntime（1601）：在android。 support.v4.app.FragmentActivity.onStart（FragmentActivity。java：552） 10-29 13：52：50.286：E/AndroidRuntime（1601）：at android.app.Instrumentation.callActivityOnStart（Instrumentation.java:1163） 10-29 13：52：50.286：E/AndroidRuntime 1601）：at android.app.Activity.performStart（Activity.java:5018） 10-29 13：52：50.286：E/AndroidRuntime（1601）：at android.app.ActivityThread.performLaunchActivity（ActivityThread.java:2032）

我希望大家幫幫我，它的我最後的機會（

來源

2013-10-29 Sashashpola

哪些代碼在線寫入：片段中的43 – Tejas

10-29 13:52:50.286: E/AndroidRuntime(1601): Caused by: java.lang.NullPointerException 
10-29 13:52:50.286: E/AndroidRuntime(1601): at com.example.m.i.f.projectsandroidtestapp.fragment.DayForecastFragment.onCreateView(DayForecastFragment.java:43)

一個null在onCreateView()，DayForecastFragment.java [R解除引用ow 43.

在onCreateView()中放置一個調試器斷點，然後以調試模式運行程序，逐步完成並檢查變量值以瞭解發生了什麼以及發生了什麼。學習如何調試是一項至關重要的技能，如果你想以開發者的身份生存下去。

來源

2013-11-04 09:47:45 laalto

回答

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