Android兼容性库CursorLoader：java.lang.IllegalStateException：游标已关闭

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我目前正在使用 Android兼容性库中的片段内的CursorLoader.
几乎每次,在Droid 2(我无法在Nexus One或Sensation上重现),似乎游标正在关闭太快,这是导致各种错误.不幸的是,我的代码中没有任何帮助的痕迹(因为问题是为什么Cursor被关闭,而不是Android通知),所以我真的很想弄清楚出了什么问题.有其他人遇到这个问题吗？ (或有想法可能发生).

一些堆栈跟踪：

  1. java.lang.IllegalStateException: Cursor is closed                                    
  2.     at android.database.sqlite.sqliteCursor.fillWindow(sqliteCursor.java:278)         
  3.     at android.database.sqlite.sqliteCursor.onMove(sqliteCursor.java:255)             
  4.     at android.database.AbstractCursor.moveToPosition(AbstractCursor.java:187)        
  5.     at android.database.CursorWrapper.moveToPosition(CursorWrapper.java:187)          
  6.     at android.support.v4.widget.CursorAdapter.getItemId(CursorAdapter.java:226)      
  7.     at android.widget.AbsListView$PerformClick.run(AbsListView.java:1721)             
  8.     at android.os.Handler.handleCallback(Handler.java:587)                            
  9.     at android.os.Handler.dispatchMessage(Handler.java:92)                            
  10.     at android.os.Looper.loop(Looper.java:143)                                        
  11.     at android.app.ActivityThread.main(ActivityThread.java:4717)                      
  12.     at java.lang.reflect.Method.invokeNative(Native Method)                           
  13.     at java.lang.reflect.Method.invoke(Method.java:521)                               
  14.     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
  15.     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)                   
  16.     at dalvik.system.NativeStart.main(Native Method)           
  17.  
  18. java.lang.IllegalStateException: Cursor is closed                                                          
  19.     at android.database.sqlite.sqliteCursor.fillWindow(sqliteCursor.java:278)                               
  20.     at android.database.sqlite.sqliteCursor.onMove(sqliteCursor.java:255)                                   
  21.     at android.database.AbstractCursor.moveToPosition(AbstractCursor.java:187)                              
  22.     at android.database.CursorWrapper.moveToPosition(CursorWrapper.java:187)                                
  23.     at android.support.v4.widget.CursorAdapter.getItemId(CursorAdapter.java:226)                            
  24.     at android.widget.AdapterView.getItemIdAtPosition(AdapterView.java:745)                                 
  25.     at android.widget.AdapterView.setSelectedPositionInt(AdapterView.java:1081)                             
  26.     at android.widget.AbsListView.onTouchEvent(AbsListView.java:2207)                                       
  27.     at android.widget.ListView.onTouchEvent(ListView.java:3377)                                             
  28.     at android.view.View.dispatchTouchEvent(View.java:3766)                                                 
  29.     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:897)                                        
  30.     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:936)                                        
  31.     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:936)                                        
  32.     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:936)                                        
  33.     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:936)                                        
  34.     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:936)                                        
  35.     at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:1800)
  36.     at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1140)          
  37.     at android.app.Activity.dispatchTouchEvent(Activity.java:2105)                                          
  38.     at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:1784)     
  39.     at android.view.ViewRoot.handleMessage(ViewRoot.java:1794)                                              
  40.     at android.os.Handler.dispatchMessage(Handler.java:99)                                                  
  41.     at android.os.Looper.loop(Looper.java:143)                                                              
  42.     at android.app.ActivityThread.main(ActivityThread.java:4717)                                            
  43.     at java.lang.reflect.Method.invokeNative(Native Method)                                                 
  44.     at java.lang.reflect.Method.invoke(Method.java:521)                                                     
  45.     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)                      
  46.     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)                                         
  47.     at dalvik.system.NativeStart.main(Native Method)     
  48.  
  49. java.lang.RuntimeException: Unable to pause activity : java.lang.IllegalStateException: Cursor is closed
  50.     at android.app.ActivityThread.performPauseActivity(ActivityThread.java:3438)                         
  51.     at android.app.ActivityThread.performPauseActivity(ActivityThread.java:3395)                         
  52.     at android.app.ActivityThread.handlePauseActivity(ActivityThread.java:3378)                          
  53.     at android.app.ActivityThread.access$2700(ActivityThread.java:129)                                   
  54.     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2124)                              
  55.     at android.os.Handler.dispatchMessage(Handler.java:99)                                               
  56.     at android.os.Looper.loop(Looper.java:143)                                                           
  57.     at android.app.ActivityThread.main(ActivityThread.java:4717)                                         
  58.     at java.lang.reflect.Method.invokeNative(Native Method)                                              
  59.     at java.lang.reflect.Method.invoke(Method.java:521)                                                  
  60.     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)                   
  61.     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)                                      
  62.     at dalvik.system.NativeStart.main(Native Method)                                                     
  63. Caused by: java.lang.IllegalStateException: Cursor is closed                                            
  64.     at android.database.sqlite.sqliteCursor.fillWindow(sqliteCursor.java:278)                            
  65.     at android.database.sqlite.sqliteCursor.onMove(sqliteCursor.java:255)                                
  66.     at android.database.AbstractCursor.moveToPosition(AbstractCursor.java:187)                           
  67.     at android.database.CursorWrapper.moveToPosition(CursorWrapper.java:187)                             
  68.     at android.support.v4.widget.CursorAdapter.getItemId(CursorAdapter.java:226)                         
  69.     at android.widget.AbsListView.onSaveInstanceState(AbsListView.java:910)                              
  70.     at android.widget.ListView.onSaveInstanceState(ListView.java:3687)                                   
  71.     at android.view.View.dispatchSaveInstanceState(View.java:6070)                                       
  72.     at android.view.ViewGroup.dispatchFreezeSelfOnly(ViewGroup.java:1197)                                
  73.     at android.widget.AdapterView.dispatchSaveInstanceState(AdapterView.java:759)                        
  74.     at android.view.ViewGroup.dispatchSaveInstanceState(ViewGroup.java:1184)                             
  75.     at android.view.View.saveHierarchyState(View.java:6053)                                              
  76.     at android.support.v4.app.FragmentManagerImpl.saveFragmentViewState(FragmentManager.java:1387)       
  77.     at android.support.v4.app.FragmentManagerImpl.saveAllState(FragmentManager.java:1439)                
  78.     at android.support.v4.app.FragmentActivity.onSaveInstanceState(FragmentActivity.java:468)            
  79.     at android.app.Activity.performSaveInstanceState(Activity.java:1040)                                 
  80.     at android.app.Instrumentation.callActivityOnSaveInstanceState(Instrumentation.java:1180)            
  81.     at android.app.ActivityThread.performPauseActivity(ActivityThread.java:3420)                         
  82.     ... 12 more

而对于好的措施,至少在我的代码中有一行：

  1. android.database.StaleDataException: Access closed cursor                                   
  2.     at android.database.AbstractWindowedCursor.checkPosition(AbstractWindowedCursor.java:217)
  3.     at android.database.AbstractWindowedCursor.getBlob(AbstractWindowedCursor.java:27)       
  4.     at android.database.CursorWrapper.getBlob(CursorWrapper.java:143)                        
  5.     at android.database.CursorWrapper.getBlob(CursorWrapper.java:143)                        
  6.     at com.testapp.TestFragment$1.setViewValue(TestFragment.java:84)                         
  7.     at android.support.v4.widget.SimpleCursorAdapter.bindView(SimpleCursorAdapter.java:131)  
  8.     at android.support.v4.widget.CursorAdapter.getView(CursorAdapter.java:257)               
  9.     at android.widget.AbsListView.obtainView(AbsListView.java:1319)                          
  10.     at android.widget.ListView.makeAndAddView(ListView.java:1789)                            
  11.     at android.widget.ListView.fillDown(ListView.java:656)                                   
  12.     at android.widget.ListView.fillSpecific(ListView.java:1342)                              
  13.     at android.widget.ListView.layoutChildren(ListView.java:1616)                            
  14.     at android.widget.AbsListView.onLayout(AbsListView.java:1172)                            
  15.     at android.view.View.layout(View.java:7037)                                              
  16.     at android.widget.FrameLayout.onLayout(FrameLayout.java:333)                             
  17.     at android.view.View.layout(View.java:7037)                                              
  18.     at android.widget.FrameLayout.onLayout(FrameLayout.java:333)                             
  19.     at android.view.View.layout(View.java:7037)                                              
  20.     at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1249)                     
  21.     at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1125)                    
  22.     at android.widget.LinearLayout.onLayout(LinearLayout.java:1042)                          
  23.     at android.view.View.layout(View.java:7037)                                              
  24.     at android.widget.FrameLayout.onLayout(FrameLayout.java:333)                             
  25.     at android.view.View.layout(View.java:7037)                                              
  26.     at android.widget.FrameLayout.onLayout(FrameLayout.java:333)                             
  27.     at android.view.View.layout(View.java:7037)                                              
  28.     at android.view.ViewRoot.performTraversals(ViewRoot.java:1054)                           
  29.     at android.view.ViewRoot.handleMessage(ViewRoot.java:1736)                               
  30.     at android.os.Handler.dispatchMessage(Handler.java:99)                                   
  31.     at android.os.Looper.loop(Looper.java:143)                                               
  32.     at android.app.ActivityThread.main(ActivityThread.java:4717)                             
  33.     at java.lang.reflect.Method.invokeNative(Native Method)                                  
  34.     at java.lang.reflect.Method.invoke(Method.java:521)                                      
  35.     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)       
  36.     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)                          
  37.     at dalvik.system.NativeStart.main(Native Method)

更新：修正,请看下面我的答案

解决方法

我没有提示问题是什么,但也许这可以帮助你固定下来.

创建一个这样的LoggedCursor并设置光标工厂,这样你的查询就可以给你LoggedCursor：

  1. class LoggedCursor extends sqliteCursor {
  2.     @Override
  3.     public void close() {
  4.         Log.d(TAG,"Cursor closed by:",new RuntimeException("Stack trace"));
  5.         super.close();
  6.     }
  7. }

RuntimeException只是为了轻松记录堆栈跟踪,而不是抛出它.当光标关闭时,您将看到日志中的跟踪.

希望这有助于弄清楚什么时候和由谁关闭.

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