android - 游标在调用此方法之前停用

Question

我有一个 CursorAdapter，我从 onLoadFinished() 回调内部交换数据。紧接着，我还需要为多个其他 CursorAdapters 使用相同的游标(下图仅显示 1 个)。问题是在游标 data 被交换到原始 CursorAdapter 之后，我得到以下错误。如果我稍后在应用程序中从原始 CursorAdapter getCursor()，它可以正常工作而不会出现任何错误。这是为什么 ？ swapCursor() 是异步的还是什么？我最初是这么认为的，但是在我尝试将 data Cursor 直接设置为其他 CursorAdapters 之后，它仍然让我出错。那么是什么给了？有什么想法吗？

   @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

显然是因为代码中的一些问题，onLoadFinished() 回调几乎同时被调用了两次，这可能对data 光标。因此，如果您遇到此问题，请仔细检查您的代码。