Android:SimpleCursorAdapter.bindView有时为findViewById提供空值

我有一个从SimpleCursorAdapter扩展而来的自定义ListCursorAdapter。在列表的行中，有两个文本字段和一个复选框

快速滚动时，复选框的行为很奇怪；选定的行从一行“跳”到另一行，例如，如果第三行包含选定的复选框，并且我正在快速滚动，则会突然选择另一行

我发现有时候，我的bindView方法中的findViewById返回null：

    @Override
public final View newView(final Context context, final Cursor cursor, final ViewGroup parent) {
    final LayoutInflater inflater = LayoutInflater.from(context);
    final View v = inflater.inflate(mLayout, null);

    return v;
}

@Override
public final void bindView(final View v, final Context context, final Cursor cursor) {
    int haltestelleCol = cursor.getColumnIndex("haltestelle");
    int nameCol = cursor.getColumnIndex("name");
    int linieCol = cursor.getColumnIndex("linie");
    int startseiteCol = cursor.getColumnIndex("startseite");
    int idCol = cursor.getColumnIndex("_id");
    final String haltestelleString = cursor.getString(haltestelleCol);
    final String nameString = cursor.getString(nameCol);

    // Next set the haltestelle of the entry.
    final TextView haltestelle = (TextView) v.findViewById(R.id.favorite_haltestelle);
    if (haltestelle != null) {
        if (nameString != null && !nameString.equals("")) {
           haltestelle.setText(nameString);
        } else {
            haltestelle.setText(haltestelleString);
        }
    }

    // next set the linie
    final TextView linie = (TextView) v.findViewById(R.id.favorite_linie);
    if (linie != null) {
        linie.setText(cursor.getString(linieCol));
    }

    // set startseite-flag or not
    final int startseite = cursor.getInt(startseiteCol);
    final CheckBox startseiteCheckbox = (CheckBox) v.findViewById(R.id.favorite_startseite);
    final int id = cursor.getInt(idCol);
    if (startseiteCheckbox != null) {
        if (startseite > 0) {
          startseiteCheckbox.setChecked(true);
        }

        checkboxes.add(startseiteCheckbox);
        startseiteCheckbox.setId(id);
        startseiteCheckbox.setOnClickListener(new StartseiteClickListener(cursor.getPosition()));
    } else {
      System.out.println();
    }
}

i、 我在“System.out.println（）”部分。有人能告诉我为什么我有这种行为吗？经常调用bindView方法对吗？它不应该每行只调用一次吗

非常感谢

更新： 有两种不同的堆栈跟踪： 如果返回的复选框不为空（=当它工作时），StackTrace如下所示：

Thread [<3> main] (Suspended (breakpoint at line 110 in FavoriteListCursorAdapter)) 
FavoriteListCursorAdapter.bindView(View, Context, Cursor) line: 110 
FavoriteListCursorAdapter(CursorAdapter).getView(int, View, ViewGroup) line: 186    
ListView(AbsListView).obtainView(int) line: 1274    
ListView.makeAndAddView(int, int, boolean, int, boolean) line: 1668 
ListView.fillUp(int, int) line: 667 
ListView.fillGap(boolean) line: 613 
ListView(AbsListView).trackMotionScroll(int, int) line: 2531    
ListView(AbsListView).onTouchEvent(MotionEvent) line: 2001  
ListView.onTouchEvent(MotionEvent) line: 3234   
ListView(View).dispatchTouchEvent(MotionEvent) line: 3709   
ListView(ViewGroup).dispatchTouchEvent(MotionEvent) line: 852   
LinearLayout(ViewGroup).dispatchTouchEvent(MotionEvent) line: 884   
ViewFlipper(ViewGroup).dispatchTouchEvent(MotionEvent) line: 884    
LinearLayout(ViewGroup).dispatchTouchEvent(MotionEvent) line: 884   
FrameLayout(ViewGroup).dispatchTouchEvent(MotionEvent) line: 884    
PhoneWindow$DecorView(ViewGroup).dispatchTouchEvent(MotionEvent) line: 884  
PhoneWindow$DecorView.superDispatchTouchEvent(MotionEvent) line: 1659   
PhoneWindow.superDispatchTouchEvent(MotionEvent) line: 1107 
FavoritenActivity(Activity).dispatchTouchEvent(MotionEvent) line: 2061  
PhoneWindow$DecorView.dispatchTouchEvent(MotionEvent) line: 1643    
FrameLayout(ViewGroup).dispatchTouchEvent(MotionEvent) line: 884    
LinearLayout(ViewGroup).dispatchTouchEvent(MotionEvent) line: 884   
TabHost(ViewGroup).dispatchTouchEvent(MotionEvent) line: 884    
FrameLayout(ViewGroup).dispatchTouchEvent(MotionEvent) line: 884    
LinearLayout(ViewGroup).dispatchTouchEvent(MotionEvent) line: 884   
PhoneWindow$DecorView(ViewGroup).dispatchTouchEvent(MotionEvent) line: 884  
PhoneWindow$DecorView.superDispatchTouchEvent(MotionEvent) line: 1659   
PhoneWindow.superDispatchTouchEvent(MotionEvent) line: 1107 
Scout(Activity).dispatchTouchEvent(MotionEvent) line: 2061  
PhoneWindow$DecorView.dispatchTouchEvent(MotionEvent) line: 1643    
ViewRoot.handleMessage(Message) line: 1691  
ViewRoot(Handler).dispatchMessage(Message) line: 99 
Looper.loop() line: 123 
ActivityThread.main(String[]) line: 4363    
Method.invokeNative(Object, Object[], Class, Class[], Class, int, boolean) line: not available [native method]  
Method.invoke(Object, Object...) line: 521  
ZygoteInit$MethodAndArgsCaller.run() line: 860  
ZygoteInit.main(String[]) line: 618 
NativeStart.main(String[]) line: not available [native method]

Thread [<3> main] (Suspended (breakpoint at line 123 in FavoriteListCursorAdapter)) 
FavoriteListCursorAdapter.bindView(View, Context, Cursor) line: 123 
FavoriteListCursorAdapter(CursorAdapter).getView(int, View, ViewGroup) line: 186    
ListView(AbsListView).obtainView(int) line: 1256    
ListView.makeAndAddView(int, int, boolean, int, boolean) line: 1668 
ListView.fillUp(int, int) line: 667 
ListView.correctTooHigh(int) line: 1289 
ListView.fillGap(boolean) line: 609 
ListView(AbsListView).trackMotionScroll(int, int) line: 2531    
ListView(AbsListView).onTouchEvent(MotionEvent) line: 2001  
ListView.onTouchEvent(MotionEvent) line: 3234   
ListView(View).dispatchTouchEvent(MotionEvent) line: 3709   
ListView(ViewGroup).dispatchTouchEvent(MotionEvent) line: 852   
LinearLayout(ViewGroup).dispatchTouchEvent(MotionEvent) line: 884   
ViewFlipper(ViewGroup).dispatchTouchEvent(MotionEvent) line: 884    
LinearLayout(ViewGroup).dispatchTouchEvent(MotionEvent) line: 884   
FrameLayout(ViewGroup).dispatchTouchEvent(MotionEvent) line: 884    
PhoneWindow$DecorView(ViewGroup).dispatchTouchEvent(MotionEvent) line: 884  
PhoneWindow$DecorView.superDispatchTouchEvent(MotionEvent) line: 1659   
PhoneWindow.superDispatchTouchEvent(MotionEvent) line: 1107 
FavoritenActivity(Activity).dispatchTouchEvent(MotionEvent) line: 2061  
PhoneWindow$DecorView.dispatchTouchEvent(MotionEvent) line: 1643    
FrameLayout(ViewGroup).dispatchTouchEvent(MotionEvent) line: 884    
LinearLayout(ViewGroup).dispatchTouchEvent(MotionEvent) line: 884   
TabHost(ViewGroup).dispatchTouchEvent(MotionEvent) line: 884    
FrameLayout(ViewGroup).dispatchTouchEvent(MotionEvent) line: 884    
LinearLayout(ViewGroup).dispatchTouchEvent(MotionEvent) line: 884   
PhoneWindow$DecorView(ViewGroup).dispatchTouchEvent(MotionEvent) line: 884  
PhoneWindow$DecorView.superDispatchTouchEvent(MotionEvent) line: 1659   
PhoneWindow.superDispatchTouchEvent(MotionEvent) line: 1107 
Scout(Activity).dispatchTouchEvent(MotionEvent) line: 2061  
PhoneWindow$DecorView.dispatchTouchEvent(MotionEvent) line: 1643    
ViewRoot.handleMessage(Message) line: 1691  
ViewRoot(Handler).dispatchMessage(Message) line: 99 
Looper.loop() line: 123 
ActivityThread.main(String[]) line: 4363    
Method.invokeNative(Object, Object[], Class, Class[], Class, int, boolean) line: not available [native method]  
Method.invoke(Object, Object...) line: 521  
ZygoteInit$MethodAndArgsCaller.run() line: 860  
ZygoteInit.main(String[]) line: 618 
NativeStart.main(String[]) line: not available [native method]  

Thread[main]（挂起（FavoriteListCursorAdapter中第110行的断点））
FavoriteListCursorAdapter.bindView（视图、上下文、光标）行：110
FavoriteListCursorAdapter（CursorAdapter）.getView（int，View，ViewGroup）行：186
列表视图（AbsListView）。获取视图（int）行：1274
makeAndAddView（int，int，boolean，int，boolean）行：1668
ListView.fillUp（int，int）行：667
ListView.fillGap（布尔）行：613
ListView（AbsListView）。轨迹运动滚动（int，int）行：2531
ListView（AbsListView）.onTouchEvent（MotionEvent）行：2001
onTouchEvent（MotionEvent）行：3234
ListView（视图）.dispatchTouchEvent（MotionEvent）行：3709
ListView（ViewGroup）.dispatchTouchEvent（MotionEvent）行：852
LinearLayout（视图组）。dispatchTouchEvent（MotionEvent）行：884
ViewFlipper（ViewGroup）.dispatchTouchEvent（MotionEvent）行：884
LinearLayout（视图组）。dispatchTouchEvent（MotionEvent）行：884
FrameLayout（视图组）.dispatchTouchEvent（MotionEvent）行：884
PhoneWindow$DecorView（视图组）。dispatchTouchEvent（MotionEvent）行：884
PhoneWindow$DecorView.superDispatchTouchEvent（MotionEvent）行：1659
PhoneWindow.superDispatchTouchEvent（MotionEvent）行：1107
FavoriteActivity（活动）。dispatchTouchEvent（MotionEvent）行：2061
PhoneWindow$DecorView.dispatchTouchEvent（MotionEvent）行：1643
FrameLayout（视图组）.dispatchTouchEvent（MotionEvent）行：884
LinearLayout（视图组）。dispatchTouchEvent（MotionEvent）行：884
TabHost（ViewGroup）.dispatchTouchEvent（MotionEvent）行：884
FrameLayout（视图组）.dispatchTouchEvent（MotionEvent）行：884
LinearLayout（视图组）。dispatchTouchEvent（MotionEvent）行：884
PhoneWindow$DecorView（视图组）。dispatchTouchEvent（MotionEvent）行：884
PhoneWindow$DecorView.superDispatchTouchEvent（MotionEvent）行：1659
PhoneWindow.superDispatchTouchEvent（MotionEvent）行：1107
侦察员（活动）。dispatchTouchEvent（MotionEvent）线路：2061
PhoneWindow$DecorView.dispatchTouchEvent（MotionEvent）行：1643
ViewRoot.handleMessage（消息）行：1691
ViewRoot（处理程序）。dispatchMessage（消息）行：99
Looper.loop（）行：123
ActivityThread.main（字符串[]）行：4363
invokenactive（Object，Object[]，Class，Class[]，Class，int，boolean）行：不可用[本机方法]
调用（对象，对象…）行：521
ZygoteInit$MethodAndArgsCaller.run（）行：860
颧骨单位。主（字符串[]）行：618
NativeStart.main（字符串[]）行：不可用[本机方法]

当返回的对象为null时，StackTrace如下所示：

Thread [<3> main] (Suspended (breakpoint at line 110 in FavoriteListCursorAdapter)) 
FavoriteListCursorAdapter.bindView(View, Context, Cursor) line: 110 
FavoriteListCursorAdapter(CursorAdapter).getView(int, View, ViewGroup) line: 186    
ListView(AbsListView).obtainView(int) line: 1274    
ListView.makeAndAddView(int, int, boolean, int, boolean) line: 1668 
ListView.fillUp(int, int) line: 667 
ListView.fillGap(boolean) line: 613 
ListView(AbsListView).trackMotionScroll(int, int) line: 2531    
ListView(AbsListView).onTouchEvent(MotionEvent) line: 2001  
ListView.onTouchEvent(MotionEvent) line: 3234   
ListView(View).dispatchTouchEvent(MotionEvent) line: 3709   
ListView(ViewGroup).dispatchTouchEvent(MotionEvent) line: 852   
LinearLayout(ViewGroup).dispatchTouchEvent(MotionEvent) line: 884   
ViewFlipper(ViewGroup).dispatchTouchEvent(MotionEvent) line: 884    
LinearLayout(ViewGroup).dispatchTouchEvent(MotionEvent) line: 884   
FrameLayout(ViewGroup).dispatchTouchEvent(MotionEvent) line: 884    
PhoneWindow$DecorView(ViewGroup).dispatchTouchEvent(MotionEvent) line: 884  
PhoneWindow$DecorView.superDispatchTouchEvent(MotionEvent) line: 1659   
PhoneWindow.superDispatchTouchEvent(MotionEvent) line: 1107 
FavoritenActivity(Activity).dispatchTouchEvent(MotionEvent) line: 2061  
PhoneWindow$DecorView.dispatchTouchEvent(MotionEvent) line: 1643    
FrameLayout(ViewGroup).dispatchTouchEvent(MotionEvent) line: 884    
LinearLayout(ViewGroup).dispatchTouchEvent(MotionEvent) line: 884   
TabHost(ViewGroup).dispatchTouchEvent(MotionEvent) line: 884    
FrameLayout(ViewGroup).dispatchTouchEvent(MotionEvent) line: 884    
LinearLayout(ViewGroup).dispatchTouchEvent(MotionEvent) line: 884   
PhoneWindow$DecorView(ViewGroup).dispatchTouchEvent(MotionEvent) line: 884  
PhoneWindow$DecorView.superDispatchTouchEvent(MotionEvent) line: 1659   
PhoneWindow.superDispatchTouchEvent(MotionEvent) line: 1107 
Scout(Activity).dispatchTouchEvent(MotionEvent) line: 2061  
PhoneWindow$DecorView.dispatchTouchEvent(MotionEvent) line: 1643    
ViewRoot.handleMessage(Message) line: 1691  
ViewRoot(Handler).dispatchMessage(Message) line: 99 
Looper.loop() line: 123 
ActivityThread.main(String[]) line: 4363    
Method.invokeNative(Object, Object[], Class, Class[], Class, int, boolean) line: not available [native method]  
Method.invoke(Object, Object...) line: 521  
ZygoteInit$MethodAndArgsCaller.run() line: 860  
ZygoteInit.main(String[]) line: 618 
NativeStart.main(String[]) line: not available [native method]

Thread [<3> main] (Suspended (breakpoint at line 123 in FavoriteListCursorAdapter)) 
FavoriteListCursorAdapter.bindView(View, Context, Cursor) line: 123 
FavoriteListCursorAdapter(CursorAdapter).getView(int, View, ViewGroup) line: 186    
ListView(AbsListView).obtainView(int) line: 1256    
ListView.makeAndAddView(int, int, boolean, int, boolean) line: 1668 
ListView.fillUp(int, int) line: 667 
ListView.correctTooHigh(int) line: 1289 
ListView.fillGap(boolean) line: 609 
ListView(AbsListView).trackMotionScroll(int, int) line: 2531    
ListView(AbsListView).onTouchEvent(MotionEvent) line: 2001  
ListView.onTouchEvent(MotionEvent) line: 3234   
ListView(View).dispatchTouchEvent(MotionEvent) line: 3709   
ListView(ViewGroup).dispatchTouchEvent(MotionEvent) line: 852   
LinearLayout(ViewGroup).dispatchTouchEvent(MotionEvent) line: 884   
ViewFlipper(ViewGroup).dispatchTouchEvent(MotionEvent) line: 884    
LinearLayout(ViewGroup).dispatchTouchEvent(MotionEvent) line: 884   
FrameLayout(ViewGroup).dispatchTouchEvent(MotionEvent) line: 884    
PhoneWindow$DecorView(ViewGroup).dispatchTouchEvent(MotionEvent) line: 884  
PhoneWindow$DecorView.superDispatchTouchEvent(MotionEvent) line: 1659   
PhoneWindow.superDispatchTouchEvent(MotionEvent) line: 1107 
FavoritenActivity(Activity).dispatchTouchEvent(MotionEvent) line: 2061  
PhoneWindow$DecorView.dispatchTouchEvent(MotionEvent) line: 1643    
FrameLayout(ViewGroup).dispatchTouchEvent(MotionEvent) line: 884    
LinearLayout(ViewGroup).dispatchTouchEvent(MotionEvent) line: 884   
TabHost(ViewGroup).dispatchTouchEvent(MotionEvent) line: 884    
FrameLayout(ViewGroup).dispatchTouchEvent(MotionEvent) line: 884    
LinearLayout(ViewGroup).dispatchTouchEvent(MotionEvent) line: 884   
PhoneWindow$DecorView(ViewGroup).dispatchTouchEvent(MotionEvent) line: 884  
PhoneWindow$DecorView.superDispatchTouchEvent(MotionEvent) line: 1659   
PhoneWindow.superDispatchTouchEvent(MotionEvent) line: 1107 
Scout(Activity).dispatchTouchEvent(MotionEvent) line: 2061  
PhoneWindow$DecorView.dispatchTouchEvent(MotionEvent) line: 1643    
ViewRoot.handleMessage(Message) line: 1691  
ViewRoot(Handler).dispatchMessage(Message) line: 99 
Looper.loop() line: 123 
ActivityThread.main(String[]) line: 4363    
Method.invokeNative(Object, Object[], Class, Class[], Class, int, boolean) line: not available [native method]  
Method.invoke(Object, Object...) line: 521  
ZygoteInit$MethodAndArgsCaller.run() line: 860  
ZygoteInit.main(String[]) line: 618 
NativeStart.main(String[]) line: not available [native method]  

Thread[main]（挂起（FavoriteListCursorAdapter中第123行的断点））
FavoriteListCursorAdapter.bindView（视图、上下文、光标）行：123
FavoriteListCursorAdapter（CursorAdapter）.getView（int，View，ViewGroup）行：186
列表视图（AbsListView）。获取视图（int）行：1256
makeAndAddView（int，int，boolean，int，boolean）行：1668
ListView.fillUp（int，int）行：667
ListView.correctTooHigh（int）行：1289
ListView.fillGap（布尔）行：609
ListView（AbsListView）。轨迹运动滚动（int，int）行：2531
ListView（AbsListView）.onTouchEvent（MotionEvent）行：2001
onTouchEvent（MotionEvent）行：3234
ListView（视图）.dispatchTouchEvent（MotionEvent）行：3709
ListView（ViewGroup）.dispatchTouchEvent（MotionEvent）行：852
LinearLayout（视图组）。dispatchTouchEvent（MotionEvent）行：884
ViewFlipper（ViewGroup）.dispatchTouchEvent（MotionEvent）行：884
LinearLayout（视图组）。dispatchTouchEvent（MotionEvent）行：884
FrameLayout（视图组）.dispatchTouchEvent（MotionEvent）行：884
PhoneWindow$DecorView（视图组）。dispatchTouchEvent（MotionEvent）行：884
PhoneWindow$DecorView.superDispatchTouchEvent（MotionEvent）行：1659
PhoneWindow.superDispatchTouchEvent（MotionEvent）行：1107
FavoriteActivity（活动）。dispatchTouchEvent（MotionEvent）行：2061
PhoneWindow$DecorView.dispatchTouchEvent（MotionEvent）行：1643
FrameLayout（视图组）.dispatchTouchEvent（MotionEvent）行：884
LinearLayout（视图组）。dispatchTouchEvent（MotionEvent）行：884
TabHost（ViewGroup）.dispatchTouchEvent（MotionEvent）行：884
FrameLayout（视图组）.dispatchTouchEvent（MotionEvent）行：884
LinearLayout（视图组）。dispatchTouchEvent（MotionEvent）行：884
PhoneWindow$DecorView（视图组）。dispatchTouchEvent（MotionEvent）行：884
PhoneWindow$DecorView.superDispatchTouchEvent（MotionEvent）行：1659
PhoneWindow.superDispatchTouchEvent（MotionEvent）行：1107
侦察员（活动）。dispatchTouchEvent（MotionEvent）线路：2061
PhoneWindow$DecorView.dispatchTouchEvent（MotionEvent）行：1643
ViewRoot.handleMessage（消息）行：1691
ViewRoot（处理程序）。dispatchMessage（消息）行：99
Looper.loop（）行：123
ActivityThread.main（字符串[]）行：4363
invokenactive（Object，Object[]，Class，Class[]，Class，int，boolean）行：不可用[本机方法]
调用（对象，对象…）行：521
ZygoteInit$MethodAndArgsCaller.run（）行：860
主合子体(