异常:android.database.StaleDataException: Attempted to access a cursor after it has been closed
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1.老规矩,贴报错信息:
Unable to resume activity {com.hy.gzh/com.hy.gzh.ui.activity.workcircle.SendDynamicActivity}: android.database.StaleDataException: Attempted to access a cursor after it has been closed.at android.app.ActivityThread.performResumeActivity(ActivityThread.java:3035)at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:3064)at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1298)at android.os.Handler.dispatchMessage(Handler.java:102)at android.os.Looper.loop(Looper.java:136)at android.app.ActivityThread.main(ActivityThread.java:5314)...Caused by: android.database.StaleDataException: Attempted to access a cursor after it has been closed.at android.database.BulkCursorToCursorAdaptor.throwIfCursorIsClosed(BulkCursorToCursorAdaptor.java:64)at android.database.BulkCursorToCursorAdaptor.requery(BulkCursorToCursorAdaptor.java:133)at android.database.CursorWrapper.requery(CursorWrapper.java:186)...
2.分析:
1.根据报错信息的提示: “是由于我尝试访问已经关闭的cursor而报的异常”,在网上查找了相关异常的 资料,最后经过测试,终于确定了该异常的发生原因以及解决方案!
2.那么首先截图下某位大神的博客,再附上其博客网址:
参考的博客网址:http://blog.csdn.net/lovexieyuan520/article/details/12837899
http://hzhuzhiyu.blog.163.com/blog/static/167972388201491143958532/3.解决:
- 1.首先定位错误: “cursor.close();”具体在相关操作的那部分代码里引用了;
2.将 “cursor.close()” 改为如下形式;
if(Build.VERSION.SDK_INT<14){ //在android 4.0及其以上的版本中,Cursor会自动关闭,不需要用户自己关闭 cursor.close(); }
3.但是又在试验中发现了另一问题.
我们查询数据库的时候,是不是可以使用如下两个Api进行查询1.context.managedQuery(MediaStore.Video.Media.EXTERNAL_CONTENT_URI, videoColumns,null, null, null);-------------------------------------------------------------------2.viedoCursor = context.getContentResolver().query (MediaStore.Video.Media.EXTERNAL_CONTENT_URI, videoColumns);
那么问题就来了,我发现在使用上面第2个Api查询数据库的时候,在 “cursor.close();” 不做判断版本是否小于14的操作,并不会发生异常,而使用第一个Api就发生异常了,这我就郁闷了
4.解惑:后来看到一篇博客这样写着
截图:![这里写图片描述](http://img.blog.csdn.net/20160704224108981)博客网址:http://www.cnblogs.com/yushiro/archive/2013/05/17/3084278.html
5.总结:
- 1.注意查询数据库的这两个Api的正确close方式;
- 2.关于cursor,之后有时间的话会对其充分的研究
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- 异常:android.database.StaleDataException: Attempted to access a cursor after it has been closed
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