我正在使用自定义的CursorAdapter来显示存储在数据库中的数据。数据从服务器中提取出来,进行解析,然后在单独的线程中插入到数据库中。由于我不想保留任何旧数据,因此我从表中删除所有行,然后在解析服务器响应中的信息时插入每行。如果我在ListActivity中滚动,显然有时会导致崩溃,当表被清除时,CursorAdapter getView或bindView正在尝试查询游标。在Android上的后台线程中更新SQLite数据库
这不是我的自定义CursorAdapter失败,我已经处理了使用getInt()或getString()时可能发生的RuntimeException。
从我读过的,查询序列化取决于你如何使用SQLiteOpenHelpers。 我创建了一个自定义的SQLiteOpenHelper,类似于Android演示中的记事本示例。
当我更新我的分贝我用下面的代码片段:
ContentResolver cr = ctx.getContentResolver();
ContentValues values = new ContentValues();
String response = _getUrlResponse(url);
cr.delete(tableName);
values.put(parseString(response));
cr.insert(tableName, values);
难道还有比通过使用ContentResolver的执行数据库操作的更好的办法?
的logcat的是:
03-07 15:35:07.351: ERROR/AndroidRuntime(15826): java.lang.IllegalStateException: couldn't move cursor to position 17
03-07 15:35:07.351: ERROR/AndroidRuntime(15826): at android.widget.CursorAdapter.getView(CursorAdapter.java:178)
03-07 15:35:07.351: ERROR/AndroidRuntime(15826): at android.widget.AbsListView.obtainView(AbsListView.java:1460)
03-07 15:35:07.351: ERROR/AndroidRuntime(15826): at android.widget.ListView.makeAndAddView(ListView.java:1809)
03-07 15:35:07.351: ERROR/AndroidRuntime(15826): at android.widget.ListView.fillUp(ListView.java:764)
03-07 15:35:07.351: ERROR/AndroidRuntime(15826): at android.widget.ListView.fillGap(ListView.java:710)
03-07 15:35:07.351: ERROR/AndroidRuntime(15826): at android.widget.AbsListView.trackMotionScroll(AbsListView.java:3421)
03-07 15:35:07.351: ERROR/AndroidRuntime(15826): at android.widget.AbsListView.onTouchEvent(AbsListView.java:2301)
03-07 15:35:07.351: ERROR/AndroidRuntime(15826): at android.widget.ListView.onTouchEvent(ListView.java:3621)
03-07 15:35:07.351: ERROR/AndroidRuntime(15826): at android.view.View.dispatchTouchEvent(View.java:3823)
03-07 15:35:07.351: ERROR/AndroidRuntime(15826): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:897)
03-07 15:35:07.351: ERROR/AndroidRuntime(15826): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:936)
03-07 15:35:07.351: ERROR/AndroidRuntime(15826): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:936)
03-07 15:35:07.351: ERROR/AndroidRuntime(15826): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:936)
03-07 15:35:07.351: ERROR/AndroidRuntime(15826): at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:1723)
03-07 15:35:07.351: ERROR/AndroidRuntime(15826): at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1129)
03-07 15:35:07.351: ERROR/AndroidRuntime(15826): at android.app.Activity.dispatchTouchEvent(Activity.java:2086)
03-07 15:35:07.351: ERROR/AndroidRuntime(15826): at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:1707)
03-07 15:35:07.351: ERROR/AndroidRuntime(15826): at android.view.ViewRoot.handleMessage(ViewRoot.java:1785)
03-07 15:35:07.351: ERROR/AndroidRuntime(15826): at android.os.Handler.dispatchMessage(Handler.java:99)
03-07 15:35:07.351: ERROR/AndroidRuntime(15826): at android.os.Looper.loop(Looper.java:123)
03-07 15:35:07.351: ERROR/AndroidRuntime(15826): at android.app.ActivityThread.main(ActivityThread.java:4627)
03-07 15:35:07.351: ERROR/AndroidRuntime(15826): at java.lang.reflect.Method.invokeNative(Native Method)
03-07 15:35:07.351: ERROR/AndroidRuntime(15826): at java.lang.reflect.Method.invoke(Method.java:521)
03-07 15:35:07.351: ERROR/AndroidRuntime(15826): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:858)
03-07 15:35:07.351: ERROR/AndroidRuntime(15826): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
03-07 15:35:07.351: ERROR/AndroidRuntime(15826): at dalvik.system.NativeStart.main(Native Method)
可能是很好反正张贴光标代码 – 2011-03-07 22:08:21
我应该说,我正在重写的CursorAdapter的唯一功能是NewView的()和bindView()。至于利用getCount()的建议,也许我可以做这样的事情: '@覆盖 公共查看getView(INT位置,查看convertView,ViewGroup以及母公司){ \t \t尝试{ \t \t \t回报super.getView(位置,convertView,父母); \t \t} catch(RuntimeException e){ \t \t \t e.printStackTrace(); \t \t \t super.getCursor().requery(); \t \t \t return newView(parent.getContext(),super.getCursor(),parent); \t \t} \t}' – JustinJ 2011-03-07 22:34:44