CursorIndexOutOfBounds与MergeCursor和ContentProvider
CursorIndexOutOfBounds与MergeCursor和ContentProvider
提问于 2013-10-17 20:35:30
我从我的内容提供者返回一个MergeCursor实例，从相同的内容提供者包装一个游标。听起来很奇怪，但我需要它来进行数据聚合。以下是代码：
Cursor filteredLatest = getContext().getContentResolver().query(Latest.CONTENT_URI, ALL,
null, null, null);
return new MergeCursor(new Cursor[]{filteredLatest});这里我不使用setNotificationUri，因为filteredLatest游标已经设置了通知uri。
一切顺利，我可以查看数据，直到我用新的数据更新内容提供者。
然后它就死了
10-18 00:15:19.441: E/AndroidRuntime(31491): android.database.CursorIndexOutOfBoundsException: Index -1 requested, with a size of 13
10-18 00:15:19.441: E/AndroidRuntime(31491): at android.database.AbstractCursor.checkPosition(AbstractCursor.java:424)
10-18 00:15:19.441: E/AndroidRuntime(31491): at android.database.AbstractWindowedCursor.checkPosition(AbstractWindowedCursor.java:136)
10-18 00:15:19.441: E/AndroidRuntime(31491): at android.database.AbstractWindowedCursor.getLong(AbstractWindowedCursor.java:74)
10-18 00:15:19.441: E/AndroidRuntime(31491): at android.database.CursorWrapper.getLong(CursorWrapper.java:106)
10-18 00:15:19.441: E/AndroidRuntime(31491): at android.database.MergeCursor.getLong(MergeCursor.java:116)
10-18 00:15:19.441: E/AndroidRuntime(31491): at android.database.CursorWrapper.getLong(CursorWrapper.java:106)
10-18 00:15:19.441: E/AndroidRuntime(31491): at android.widget.CursorAdapter.getItemId(CursorAdapter.java:220)
10-18 00:15:19.441: E/AndroidRuntime(31491): at android.widget.AdapterView.rememberSyncState(AdapterView.java:1195)
10-18 00:15:19.441: E/AndroidRuntime(31491): at android.widget.AdapterView$AdapterDataSetObserver.onChanged(AdapterView.java:810)
10-18 00:15:19.441: E/AndroidRuntime(31491): at android.widget.AbsListView$AdapterDataSetObserver.onChanged(AbsListView.java:5998)
10-18 00:15:19.441: E/AndroidRuntime(31491): at android.database.DataSetObservable.notifyChanged(DataSetObservable.java:37)
10-18 00:15:19.441: E/AndroidRuntime(31491): at android.widget.BaseAdapter.notifyDataSetChanged(BaseAdapter.java:50)
10-18 00:15:19.441: E/AndroidRuntime(31491): at android.widget.CursorAdapter$MyDataSetObserver.onChanged(CursorAdapter.java:467)
10-18 00:15:19.441: E/AndroidRuntime(31491): at android.database.DataSetObservable.notifyChanged(DataSetObservable.java:37)
10-18 00:15:19.441: E/AndroidRuntime(31491): at android.database.AbstractCursor.requery(AbstractCursor.java:137)
10-18 00:15:19.441: E/AndroidRuntime(31491): at android.database.sqlite.SQLiteCursor.requery(SQLiteCursor.java:234)
10-18 00:15:19.441: E/AndroidRuntime(31491): at android.database.CursorWrapper.requery(CursorWrapper.java:186)
10-18 00:15:19.441: E/AndroidRuntime(31491): at android.database.MergeCursor.requery(MergeCursor.java:228)
10-18 00:15:19.441: E/AndroidRuntime(31491): at android.database.CursorWrapper.requery(CursorWrapper.java:186)
10-18 00:15:19.441: E/AndroidRuntime(31491): at android.widget.CursorAdapter.onContentChanged(CursorAdapter.java:443)
10-18 00:15:19.441: E/AndroidRuntime(31491): at android.widget.CursorAdapter$ChangeObserver.onChange(CursorAdapter.java:459)
10-18 00:15:19.441: E/AndroidRuntime(31491): at android.database.ContentObserver.onChange(ContentObserver.java:129)
10-18 00:15:19.441: E/AndroidRuntime(31491): at android.database.ContentObserver$NotificationRunnable.run(ContentObserver.java:180)
10-18 00:15:19.441: E/AndroidRuntime(31491): at android.os.Handler.handleCallback(Handler.java:730)
10-18 00:15:19.441: E/AndroidRuntime(31491): at android.os.Handler.dispatchMessage(Handler.java:92)
10-18 00:15:19.441: E/AndroidRuntime(31491): at android.os.Looper.loop(Looper.java:137)
10-18 00:15:19.441: E/AndroidRuntime(31491): at android.app.ActivityThread.main(ActivityThread.java:5103)
10-18 00:15:19.441: E/AndroidRuntime(31491): at java.lang.reflect.Method.invokeNative(Native Method)
10-18 00:15:19.441: E/AndroidRuntime(31491): at java.lang.reflect.Method.invoke(Method.java:525)
10-18 00:15:19.441: E/AndroidRuntime(31491): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
10-18 00:15:19.441: E/AndroidRuntime(31491): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
10-18 00:15:19.441: E/AndroidRuntime(31491): at dalvik.system.NativeStart.main(Native Method)我已经查看了MergeCursor代码，似乎已经通知了包装游标数据的更改，并将MergeCursor的位置设置为-1。然后，适配器也会收到更改通知，然后就会死掉。
我不知道到哪里去找窃听器。
回答 1
Stack Overflow用户
回答已采纳
发布于 2013-10-18 09:13:19
我的方法是错的。在查看了Android拨号应用程序之后，我决定编写自己的合并适配器，而不是使用有缺陷的MergeCursor。
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原文链接：
https://stackoverflow.com/questions/19436743
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