Android兼容性库游标加载程序:java.lang.IllegalStateException:游标已关闭
我目前正在Android兼容性库的一个片段中使用游标加载程序。 几乎每一次,在Droid2上(我无法在NexusOne或Sensation上重现),似乎光标关闭得太快,这导致了各种错误。不幸的是,这些跟踪在我的代码中没有任何帮助(因为问题是为什么光标会被关闭,而不是当Android注意到时),所以我真的很难找出哪里出了问题。还有其他人遇到过这个问题吗?(或者对可能发生的事情有想法) 一些堆栈跟踪:Android兼容性库游标加载程序:java.lang.IllegalStateException:游标已关闭,android,Android,我目前正在Android兼容性库的一个片段中使用游标加载程序。 几乎每一次,在Droid2上(我无法在NexusOne或Sensation上重现),似乎光标关闭得太快,这导致了各种错误。不幸的是,这些跟踪在我的代码中没有任何帮助(因为问题是为什么光标会被关闭,而不是当Android注意到时),所以我真的很难找出哪里出了问题。还有其他人遇到过这个问题吗?(或者对可能发生的事情有想法) 一些堆栈跟踪: java.lang.IllegalStateException: Cursor is closed
java.lang.IllegalStateException: Cursor is closed
at android.database.sqlite.SQLiteCursor.fillWindow(SQLiteCursor.java:278)
at android.database.sqlite.SQLiteCursor.onMove(SQLiteCursor.java:255)
at android.database.AbstractCursor.moveToPosition(AbstractCursor.java:187)
at android.database.CursorWrapper.moveToPosition(CursorWrapper.java:187)
at android.support.v4.widget.CursorAdapter.getItemId(CursorAdapter.java:226)
at android.widget.AbsListView$PerformClick.run(AbsListView.java:1721)
at android.os.Handler.handleCallback(Handler.java:587)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:143)
at android.app.ActivityThread.main(ActivityThread.java:4717)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:521)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
at dalvik.system.NativeStart.main(Native Method)
java.lang.IllegalStateException: Cursor is closed
at android.database.sqlite.SQLiteCursor.fillWindow(SQLiteCursor.java:278)
at android.database.sqlite.SQLiteCursor.onMove(SQLiteCursor.java:255)
at android.database.AbstractCursor.moveToPosition(AbstractCursor.java:187)
at android.database.CursorWrapper.moveToPosition(CursorWrapper.java:187)
at android.support.v4.widget.CursorAdapter.getItemId(CursorAdapter.java:226)
at android.widget.AdapterView.getItemIdAtPosition(AdapterView.java:745)
at android.widget.AdapterView.setSelectedPositionInt(AdapterView.java:1081)
at android.widget.AbsListView.onTouchEvent(AbsListView.java:2207)
at android.widget.ListView.onTouchEvent(ListView.java:3377)
at android.view.View.dispatchTouchEvent(View.java:3766)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:897)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:936)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:936)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:936)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:936)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:936)
at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:1800)
at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1140)
at android.app.Activity.dispatchTouchEvent(Activity.java:2105)
at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:1784)
at android.view.ViewRoot.handleMessage(ViewRoot.java:1794)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:143)
at android.app.ActivityThread.main(ActivityThread.java:4717)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:521)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
at dalvik.system.NativeStart.main(Native Method)
java.lang.RuntimeException: Unable to pause activity : java.lang.IllegalStateException: Cursor is closed
at android.app.ActivityThread.performPauseActivity(ActivityThread.java:3438)
at android.app.ActivityThread.performPauseActivity(ActivityThread.java:3395)
at android.app.ActivityThread.handlePauseActivity(ActivityThread.java:3378)
at android.app.ActivityThread.access$2700(ActivityThread.java:129)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2124)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:143)
at android.app.ActivityThread.main(ActivityThread.java:4717)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:521)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.IllegalStateException: Cursor is closed
at android.database.sqlite.SQLiteCursor.fillWindow(SQLiteCursor.java:278)
at android.database.sqlite.SQLiteCursor.onMove(SQLiteCursor.java:255)
at android.database.AbstractCursor.moveToPosition(AbstractCursor.java:187)
at android.database.CursorWrapper.moveToPosition(CursorWrapper.java:187)
at android.support.v4.widget.CursorAdapter.getItemId(CursorAdapter.java:226)
at android.widget.AbsListView.onSaveInstanceState(AbsListView.java:910)
at android.widget.ListView.onSaveInstanceState(ListView.java:3687)
at android.view.View.dispatchSaveInstanceState(View.java:6070)
at android.view.ViewGroup.dispatchFreezeSelfOnly(ViewGroup.java:1197)
at android.widget.AdapterView.dispatchSaveInstanceState(AdapterView.java:759)
at android.view.ViewGroup.dispatchSaveInstanceState(ViewGroup.java:1184)
at android.view.View.saveHierarchyState(View.java:6053)
at android.support.v4.app.FragmentManagerImpl.saveFragmentViewState(FragmentManager.java:1387)
at android.support.v4.app.FragmentManagerImpl.saveAllState(FragmentManager.java:1439)
at android.support.v4.app.FragmentActivity.onSaveInstanceState(FragmentActivity.java:468)
at android.app.Activity.performSaveInstanceState(Activity.java:1040)
at android.app.Instrumentation.callActivityOnSaveInstanceState(Instrumentation.java:1180)
at android.app.ActivityThread.performPauseActivity(ActivityThread.java:3420)
... 12 more
对于好的度量,我的代码中至少有一行:
android.database.StaleDataException: Access closed cursor
at android.database.AbstractWindowedCursor.checkPosition(AbstractWindowedCursor.java:217)
at android.database.AbstractWindowedCursor.getBlob(AbstractWindowedCursor.java:27)
at android.database.CursorWrapper.getBlob(CursorWrapper.java:143)
at android.database.CursorWrapper.getBlob(CursorWrapper.java:143)
at com.testapp.TestFragment$1.setViewValue(TestFragment.java:84)
at android.support.v4.widget.SimpleCursorAdapter.bindView(SimpleCursorAdapter.java:131)
at android.support.v4.widget.CursorAdapter.getView(CursorAdapter.java:257)
at android.widget.AbsListView.obtainView(AbsListView.java:1319)
at android.widget.ListView.makeAndAddView(ListView.java:1789)
at android.widget.ListView.fillDown(ListView.java:656)
at android.widget.ListView.fillSpecific(ListView.java:1342)
at android.widget.ListView.layoutChildren(ListView.java:1616)
at android.widget.AbsListView.onLayout(AbsListView.java:1172)
at android.view.View.layout(View.java:7037)
at android.widget.FrameLayout.onLayout(FrameLayout.java:333)
at android.view.View.layout(View.java:7037)
at android.widget.FrameLayout.onLayout(FrameLayout.java:333)
at android.view.View.layout(View.java:7037)
at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1249)
at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1125)
at android.widget.LinearLayout.onLayout(LinearLayout.java:1042)
at android.view.View.layout(View.java:7037)
at android.widget.FrameLayout.onLayout(FrameLayout.java:333)
at android.view.View.layout(View.java:7037)
at android.widget.FrameLayout.onLayout(FrameLayout.java:333)
at android.view.View.layout(View.java:7037)
at android.view.ViewRoot.performTraversals(ViewRoot.java:1054)
at android.view.ViewRoot.handleMessage(ViewRoot.java:1736)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:143)
at android.app.ActivityThread.main(ActivityThread.java:4717)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:521)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
at dalvik.system.NativeStart.main(Native Method)
更新:已修复,请参见下面的我的答案我不知道问题出在哪里,但这可能有助于您确定问题所在 像这样创建一个
LoggedCursor
,并设置游标工厂,以便查询提供LoggedCursor:
class LoggedCursor extends SQLiteCursor {
@Override
public void close() {
Log.d(TAG, "Cursor closed by:", new RuntimeException("Stack trace"));
super.close();
}
}
创建RuntimeException
只是为了方便地记录堆栈跟踪,而不是为了抛出堆栈跟踪。当光标关闭时,您将在日志中看到跟踪
希望这有助于确定何时以及由谁关闭 我根据JBM的建议添加了日志记录,并发现以下内容: 我在代码中使用了CursorWrapper的一个子类。 在Droid2上,有人向CursorWrapper添加了一个终结器,它关闭了底层游标。这意味着每当我们的包装器被垃圾回收时,游标就被关闭。此终结器不存在于其他手机或Android源代码中。我猜有人认为他们很聪明 通过重写游标包装器中的终结器修复
protected void finalize() throws Throwable {
// Do not remove this empty method. It is designed to prevent calls to super.
// Fixes bug on Droid 2, where CursorWrapper finalizer closes the Cursor!
}
你自己关闭游标吗?不,我自己没有打开或关闭任何游标。这也是我最初的想法,但我也没有实际构建游标。光标的整个生命周期都由CursorLoader处理(这意味着我没有办法使用工厂)
CursorLoader
内部调用ContentResolver.query(…)
,这反过来会获取与URI匹配的IContentProvider
,并对其执行query(…)
。我不知道您的URI是什么,但我认为可以在启动加载程序之前获取URI的内容提供者,使用游标工厂进行设置,然后启动加载程序。或者类似的。。尝试在调试模式下获取URI的内容提供程序,找出返回的类,以便查看源代码。感谢您的帮助!我发现了这项技术的潜在问题,并将其作为一个答案发布。我没有使用CursorWrapper,但在Access关闭Cursor的情况下,我每天仍会收到大约4份崩溃报告,这些报告来自不同的手机。我无法在Nexus或Droid 1上复制它。您能否提供更多关于如何使用CursorWrapper的详细信息。我需要扩展游标加载程序吗?