NullPointerException в моем CustomAdapter

Question

Итак, я пытаюсь перестроить свой ListView с помощью пользовательского адаптера, чтобы я мог сделать его немного лучше и добавить к нему еще несколько функций. В любом случае, вот мой адаптер

HistoryAdapter.java

package com.this.app; 

import android.content.Context; 
import android.database.Cursor; 
import android.util.Log; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.BaseAdapter; 
import android.widget.TextView; 

public class HistoryAdapter extends BaseAdapter { 

    private Context mContext; 
    Cursor cursor; 

    public HistoryAdapter(Context context, Cursor cur){ 
     super(); 
     mContext = context; 
     cursor = cur; 
    } 

    public int getCount(){ 
     // return the number of records in cursor 
     return cursor.getCount(); 
    } 

    // getView method is called for each item of ListView 
    public View getView(int position, View view, ViewGroup parent){ 

     // inflate the layout for each item of listView 
     LayoutInflater inflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
     view = inflater.inflate(R.layout.history_list_item, null); 

     // move the cursor to required position 
     cursor.moveToPosition(position); 

     // fetch the information for each card 
     String pricePerGallon = cursor.getString(cursor.getColumnIndex("pricePerGallon")); 
     String gallons = cursor.getString(cursor.getColumnIndex("gallons")); 
     String odometer = cursor.getString(cursor.getColumnIndex("odometer")); 
     String date = cursor.getString(cursor.getColumnIndex("date")); 
     String filledOrNot = cursor.getString(cursor.getColumnIndex("filledOrNot")); 
     String comments = cursor.getString(cursor.getColumnIndex("comments")); 
     //String milesPerGallon = cursor.getString(cursor.getColumnIndex("miledPerGallon")); 
     String totalSpent = cursor.getString(cursor.getColumnIndex("totalSpent")); 

     // get the reference of TextViews 
     TextView textViewPricePerGallon = (TextView) view.findViewById(R.id.pricePerGallon); 
     TextView textViewGallons = (TextView) view.findViewById(R.id.gallons); 
     TextView textViewOdometer = (TextView) view.findViewById(R.id.odometer); 
     TextView textViewDate = (TextView) view.findViewById(R.id.date); 
     TextView textViewFilledOrNot = (TextView) view.findViewById(R.id.cardFilledOrNot); 
     TextView textViewComments = (TextView) view.findViewById(R.id.comments); 
     //TextView textViewMilesPerGallon = (TextView) view.findViewById(R.id.mpg); 
     TextView textViewTotalSpent = (TextView) view.findViewById(R.id.totalSpentOnFillups); 

     // Set the data to each TextView 
     Log.d("HistoryAdapter", pricePerGallon); 
     textViewPricePerGallon.setText(pricePerGallon); 
     textViewGallons.setText(gallons); 
     textViewOdometer.setText(odometer); 
     textViewDate.setText(date); 
     textViewFilledOrNot.setText(filledOrNot); 
     textViewComments.setText(comments); 
     //textViewMilesPerGallon.setText(milesPerGallon); 
     textViewTotalSpent.setText(totalSpent); 

     return view; 
    } 

    public Object getItem(int position){ 
     return position; 
    } 

    public long getItemId(int position){ 
     return position; 
    } 

} 

Я получаю NullPointerException в самом первом SetText

textViewPricePerGallon.setText(pricePerGallon); 

Теперь, если я закомментируйте все SetText, он загружает список просто отлично (он просто не прикрепляет все данные .. вместо этого он показывает все значения по умолчанию, установленные в XML)

Вот копия отладки

02-21 11:21:06.156: E/AndroidRuntime(30769): FATAL EXCEPTION: main 
02-21 11:21:06.156: E/AndroidRuntime(30769): Process: com.this.app, PID: 30769 
02-21 11:21:06.156: E/AndroidRuntime(30769): java.lang.NullPointerException 
02-21 11:21:06.156: E/AndroidRuntime(30769): at com.this.app.HistoryAdapter.getView(HistoryAdapter.java:60) 
02-21 11:21:06.156: E/AndroidRuntime(30769): at android.widget.AbsListView.obtainView(AbsListView.java:2263) 
02-21 11:21:06.156: E/AndroidRuntime(30769): at android.widget.ListView.makeAndAddView(ListView.java:1790) 
02-21 11:21:06.156: E/AndroidRuntime(30769): at android.widget.ListView.fillDown(ListView.java:691) 
02-21 11:21:06.156: E/AndroidRuntime(30769): at android.widget.ListView.fillFromTop(ListView.java:752) 
02-21 11:21:06.156: E/AndroidRuntime(30769): at android.widget.ListView.layoutChildren(ListView.java:1630) 
02-21 11:21:06.156: E/AndroidRuntime(30769): at android.widget.AbsListView.onLayout(AbsListView.java:2091) 
02-21 11:21:06.156: E/AndroidRuntime(30769): at android.view.View.layout(View.java:14825) 
02-21 11:21:06.156: E/AndroidRuntime(30769): at android.view.ViewGroup.layout(ViewGroup.java:4641) 
02-21 11:21:06.156: E/AndroidRuntime(30769): at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1671) 
02-21 11:21:06.156: E/AndroidRuntime(30769): at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1525) 
02-21 11:21:06.156: E/AndroidRuntime(30769): at android.widget.LinearLayout.onLayout(LinearLayout.java:1434) 
02-21 11:21:06.156: E/AndroidRuntime(30769): at android.view.View.layout(View.java:14825) 
02-21 11:21:06.156: E/AndroidRuntime(30769): at android.view.ViewGroup.layout(ViewGroup.java:4641) 
02-21 11:21:06.156: E/AndroidRuntime(30769): at android.widget.FrameLayout.layoutChildren(FrameLayout.java:453) 
02-21 11:21:06.156: E/AndroidRuntime(30769): at android.widget.FrameLayout.onLayout(FrameLayout.java:388) 
02-21 11:21:06.156: E/AndroidRuntime(30769): at android.view.View.layout(View.java:14825) 
02-21 11:21:06.156: E/AndroidRuntime(30769): at android.view.ViewGroup.layout(ViewGroup.java:4641) 
02-21 11:21:06.156: E/AndroidRuntime(30769): at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1671) 
02-21 11:21:06.156: E/AndroidRuntime(30769): at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1525) 
02-21 11:21:06.156: E/AndroidRuntime(30769): at android.widget.LinearLayout.onLayout(LinearLayout.java:1434) 
02-21 11:21:06.156: E/AndroidRuntime(30769): at android.view.View.layout(View.java:14825) 
02-21 11:21:06.156: E/AndroidRuntime(30769): at android.view.ViewGroup.layout(ViewGroup.java:4641) 
02-21 11:21:06.156: E/AndroidRuntime(30769): at android.widget.FrameLayout.layoutChildren(FrameLayout.java:453) 
02-21 11:21:06.156: E/AndroidRuntime(30769): at android.widget.FrameLayout.onLayout(FrameLayout.java:388) 
02-21 11:21:06.156: E/AndroidRuntime(30769): at android.view.View.layout(View.java:14825) 
02-21 11:21:06.156: E/AndroidRuntime(30769): at android.view.ViewGroup.layout(ViewGroup.java:4641) 
02-21 11:21:06.156: E/AndroidRuntime(30769): at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2016) 
02-21 11:21:06.156: E/AndroidRuntime(30769): at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1773) 
02-21 11:21:06.156: E/AndroidRuntime(30769): at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1022) 
02-21 11:21:06.156: E/AndroidRuntime(30769): at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5708) 
02-21 11:21:06.156: E/AndroidRuntime(30769): at android.view.Choreographer$CallbackRecord.run(Choreographer.java:749) 
02-21 11:21:06.156: E/AndroidRuntime(30769): at android.view.Choreographer.doCallbacks(Choreographer.java:562) 
02-21 11:21:06.156: E/AndroidRuntime(30769): at android.view.Choreographer.doFrame(Choreographer.java:532) 
02-21 11:21:06.156: E/AndroidRuntime(30769): at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:735) 
02-21 11:21:06.156: E/AndroidRuntime(30769): at android.os.Handler.handleCallback(Handler.java:733) 
02-21 11:21:06.156: E/AndroidRuntime(30769): at android.os.Handler.dispatchMessage(Handler.java:95) 
02-21 11:21:06.156: E/AndroidRuntime(30769): at android.os.Looper.loop(Looper.java:137) 
02-21 11:21:06.156: E/AndroidRuntime(30769): at android.app.ActivityThread.main(ActivityThread.java:5083) 
02-21 11:21:06.156: E/AndroidRuntime(30769): at java.lang.reflect.Method.invokeNative(Native Method) 
02-21 11:21:06.156: E/AndroidRuntime(30769): at java.lang.reflect.Method.invoke(Method.java:515) 
02-21 11:21:06.156: E/AndroidRuntime(30769): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:777) 
02-21 11:21:06.156: E/AndroidRuntime(30769): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:593) 
02-21 11:21:06.156: E/AndroidRuntime(30769): at dalvik.system.NativeStart.main(Native Method) 

Answer 1

Похоже вызова: view.findViewById(R.id.pricePerGallon) возвращается в null. Вы уверены, что pricePerGallon существует как следует в проекте?

Answer 2

Убедитесь, что идентификатор

R.id.pricePerGallon

в вашем XML

layout.history_list_item

Если вы говорите, что строка не имеет значения null, она оставляет TextView.