在调用此方法之前，光标被停用

Question

我有一个CursorAdapter，我将数据交换到onLoadFinished()回调中。之后，我还需要使用相同的光标来处理多个其他CursorAdapters（下面仅显示1个）。问题是，光标data被交换到原始CursorAdapter后，我得到以下错误。如果我在原来的CursorAdapter之后在应用中使用getCursor()，那么它的工作原理没有任何错误。这是为什么 ？异步或swapCursor()是什么？我以为这么初始，但我试图将dataCursor直接设置到其他CursorAdapters它仍然有我的错误。那么是什么给了？有任何想法吗 ？

@Override 
    public void onLoadFinished(Loader<Cursor> loader, Cursor data) 
    { 
     mAccountsCursorAdapter.swapCursor(data); 
     // create new cursor adapter 
     Cursor cursor = new CursorWrapper(mAccountsCursorAdapter.getCursor()); 
     mNewAccountsCursorAdapter.swapCursor(cursor); 
    } 

错误如下：

android.database.StaleDataException: Attempting to access a closed CursorWindow.Most probable cause: cursor is deactivated prior to calling this method. 
      at android.database.AbstractWindowedCursor.checkPosition(AbstractWindowedCursor.java:139) 
      at android.database.AbstractWindowedCursor.getString(AbstractWindowedCursor.java:50) 
      at android.database.CursorWrapper.getString(CursorWrapper.java:114) 
      at android.database.CursorWrapper.getString(CursorWrapper.java:114) 
      at android.support.v4.widget.SimpleCursorAdapter.bindView(SimpleCursorAdapter.java:135) 
      at android.support.v4.widget.CursorAdapter.getView(CursorAdapter.java:256) 
      at android.widget.AbsSpinner.onMeasure(AbsSpinner.java:197) 
      at android.widget.Spinner.onMeasure(Spinner.java:507) 
      at android.view.View.measure(View.java:17430) 
      at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:727) 
      at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:463) 
      at android.view.View.measure(View.java:17430) 
      at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5463) 
      at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1436) 
      at android.widget.LinearLayout.measureVertical(LinearLayout.java:722) 
      at android.widget.LinearLayout.onMeasure(LinearLayout.java:613) 
      at android.view.View.measure(View.java:17430) 
      at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:727) 
      at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:463) 
      at android.view.View.measure(View.java:17430) 
      at android.widget.ScrollView.measureChildWithMargins(ScrollView.java:1260) 
      at android.widget.FrameLayout.onMeasure(FrameLayout.java:430) 
      at android.widget.ScrollView.onMeasure(ScrollView.java:337) 
      at android.view.View.measure(View.java:17430) 
      at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:727) 
      at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:463) 
      at android.view.View.measure(View.java:17430) 
      at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5463) 
      at android.widget.FrameLayout.onMeasure(FrameLayout.java:430) 
      at android.view.View.measure(View.java:17430) 
      at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5463) 
      at android.widget.FrameLayout.onMeasure(FrameLayout.java:430) 
      at android.view.View.measure(View.java:17430) 
      at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5463) 
      at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1436) 
      at android.widget.LinearLayout.measureVertical(LinearLayout.java:722) 
      at android.widget.LinearLayout.onMeasure(LinearLayout.java:613) 
      at android.view.View.measure(View.java:17430) 
      at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5463) 
      at android.widget.FrameLayout.onMeasure(FrameLayout.java:430) 
      at android.view.View.measure(View.java:17430) 
      at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5463) 
      at android.widget.FrameLayout.onMeasure(FrameLayout.java:430) 
      at android.view.View.measure(View.java:17430) 
      at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5463) 
      at android.widget.FrameLayout.onMeasure(FrameLayout.java:430) 
      at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2560) 
      at android.view.View.measure(View.java:17430) 
      at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2001) 
      at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1141) 
      at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1372) 
      at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1054) 
      at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5779) 
      at android.view.Choreographer$CallbackRecord.run(Choreographer.java:767) 
      at android.view.Choreographer.doCallbacks(Choreographer.java:580) 
      at android.view.Choreographer.doFrame(Choreographer.java:550) 
      at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:753) 

Answer 1

显然是因为在代码中的一些问题上，onLoadFinished()回调被称为两次几乎在同一时间，这可能没有对data了良好的影响Cursor。因此，如果遇到此问题，请仔细检查您的代码。