NullPointerException異常上SimpleCursorAdapter

我的主頁是6頁的ViewPager（第一個設置，其他5 ListView和使用該CursorAdapter的數據）NullPointerException異常上SimpleCursorAdapter

在設置有用於打開另一個活動一個按鈕，用戶更改一些設置那麼那個活動將以finish（）（或super.onBackpressed（））結束，但是每次我調用finish（）時，都會出現NullPointerException。

我在做什麼錯？

這是我的CursorAdapter

package com.whd.roosters.adapters; 

import com.whd.roosters.R; 
import android.annotation.TargetApi; 
import android.content.Context; 
import android.database.Cursor; 
import android.os.Build; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.ImageView; 
import android.widget.SimpleCursorAdapter; 
import android.widget.TextView; 

public class RoosterCursorAdapter extends SimpleCursorAdapter { 
    private Cursor cursor; 
    private Context context; 

    @SuppressWarnings("deprecation") //New constructor available from API 11 
    public RoosterCursorAdapter(Context mContext, int layout, Cursor mCursor, String[] from, int[] to) { 
     super(mContext, layout, mCursor, from, to); 
     cursor = mCursor; 
     context = mContext; 
    } 

    @TargetApi(Build.VERSION_CODES.HONEYCOMB) 
    public RoosterCursorAdapter(Context mContext, int layout, Cursor mCursor, String[] from, int[] to, int flags) { 
     super(mContext, layout, mCursor, from, to, flags); 
     cursor = mCursor; 
     context = mContext; 
    } 

    public int getImage(int uur) { 
     if (uur == 1) return R.drawable.eerste; 
     if (uur == 2) return R.drawable.tweede; 
     if (uur == 3) return R.drawable.derde; 
     if (uur == 4) return R.drawable.vierde; 
     if (uur == 5) return R.drawable.vijfde; 
     if (uur == 6) return R.drawable.zesde; 
     if (uur == 7) return R.drawable.zevende; 
     if (uur == 8) return R.drawable.achtste; 
     return 1; 
    } 

    public View getView(int pos, View row, ViewGroup root) { 
     cursor.moveToPosition(pos); 

     String uur = cursor.getString(cursor.getColumnIndex("uur")); 
     String les = cursor.getString(cursor.getColumnIndex("les")); 
     String lok = cursor.getString(cursor.getColumnIndex("lok")); 
     String doc = cursor.getString(cursor.getColumnIndex("doc")); 

     ImageView UUR = null; 
     TextView LES = null; 
     TextView LOK = null; 
     TextView DOC = null; 

     if (lok.contains("Vrij")) { 
      if (row == null) row = ((LayoutInflater) context.getSystemService("layout_inflater")).inflate(R.layout.listview_item_rooster_vrij, null); 
      UUR = (ImageView) row.findViewById(R.id.LISTVIEW_ITEM_ROOSTER_VRIJ_IMAGEVIEW_UUR); 
      LOK = (TextView ) row.findViewById(R.id.LISTVIEW_ITEM_ROOSTER_VRIJ_TEXTVIEW_VRIJ); 
     } else { 
      if (row == null) row = ((LayoutInflater) context.getSystemService("layout_inflater")).inflate(R.layout.listview_item_rooster, null); 
      UUR = (ImageView) row.findViewById(R.id.LISTVIEW_ITEM_ROOSTER_IMAGEVIEW_UUR ); 
      LES = (TextView ) row.findViewById(R.id.LISTVIEW_ITEM_ROOSTER_TEXTVIEW_LES ); 
      LOK = (TextView ) row.findViewById(R.id.LISTVIEW_ITEM_ROOSTER_TEXTVIEW_LOKAAL); 
      DOC = (TextView ) row.findViewById(R.id.LISTVIEW_ITEM_ROOSTER_TEXTVIEW_DOCENT); 
     } 

     UUR.setAdjustViewBounds(true); 
     if ((context.getResources().getDisplayMetrics().heightPixels/10) > 10) { 
      UUR.setMaxHeight(context.getResources().getDisplayMetrics().heightPixels/10); 
     } else { 
      UUR.setMaxHeight(100); 
     } 
     UUR.setMinimumHeight(50); 
     UUR.setImageResource(getImage(Integer.parseInt(uur))); 

     LOK.setText(lok); 
     if (LES != null) LES.setText("Les: " + les); 
     if (DOC != null) DOC.setText("Docent: " + doc); 

     return row; 
    } 
}

這是堆棧跟蹤

04-07 16:08:39.430: E/AndroidRuntime(4562): FATAL EXCEPTION: main 
04-07 16:08:39.430: E/AndroidRuntime(4562): java.lang.NullPointerException 
04-07 16:08:39.430: E/AndroidRuntime(4562):  at com.whd.roosters.adapters.RoosterCursorAdapter.getView(RoosterCursorAdapter.java:72) 
04-07 16:08:39.430: E/AndroidRuntime(4562):  at android.widget.AbsListView.obtainView(AbsListView.java:1597) 
04-07 16:08:39.430: E/AndroidRuntime(4562):  at android.widget.ListView.makeAndAddView(ListView.java:1772) 
04-07 16:08:39.430: E/AndroidRuntime(4562):  at android.widget.ListView.fillDown(ListView.java:695) 
04-07 16:08:39.430: E/AndroidRuntime(4562):  at android.widget.ListView.fillGap(ListView.java:666) 
04-07 16:08:39.430: E/AndroidRuntime(4562):  at android.widget.AbsListView.trackMotionScroll(AbsListView.java:4215) 
04-07 16:08:39.430: E/AndroidRuntime(4562):  at android.widget.AbsListView$TwFlingRunnable.run(AbsListView.java:3431) 
04-07 16:08:39.430: E/AndroidRuntime(4562):  at android.os.Handler.handleCallback(Handler.java:587) 
04-07 16:08:39.430: E/AndroidRuntime(4562):  at android.os.Handler.dispatchMessage(Handler.java:92) 
04-07 16:08:39.430: E/AndroidRuntime(4562):  at android.os.Looper.loop(Looper.java:130) 
04-07 16:08:39.430: E/AndroidRuntime(4562):  at android.app.ActivityThread.main(ActivityThread.java:3691) 
04-07 16:08:39.430: E/AndroidRuntime(4562):  at java.lang.reflect.Method.invokeNative(Native Method) 
04-07 16:08:39.430: E/AndroidRuntime(4562):  at java.lang.reflect.Method.invoke(Method.java:507) 
04-07 16:08:39.430: E/AndroidRuntime(4562):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:912) 
04-07 16:08:39.430: E/AndroidRuntime(4562):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:670) 
04-07 16:08:39.430: E/AndroidRuntime(4562):  at dalvik.system.NativeStart.main(Native Method)

來源

2013-04-07 WHDeveloper

你的問題是在線72，從那裏開始。 – 2013-04-07 14:23:31

是的我知道，它是這一行UUR.setAdjustViewBounds（true）;所以ImageView UUR爲null，但是如果在行爲空的情況下對新佈局進行膨脹或者在行已經存在時獲取對它的引用，那麼這會發生什麼？ – WHDeveloper 2013-04-07 14:25:11

那麼你可能對這個視圖的id有問題。 – 2013-04-07 14:35:14

你的問題是在線72：

UUR.setAdjustViewBounds(true);

我的猜測是，你有一些問題，你的「if」陳述，而當你認爲你有正確的佈局時，我想你會得到另一個。

來源

2013-04-07 15:35:03

NullPointerException異常上SimpleCursorAdapter

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