Cursor.getInt()拋出CursorIndexOutOfBoundsException
所以,我有在SQLiteDatabaseHelper
類讀取的數,並返回一個布爾值的方法,作爲上述圖爲。如圖所示,執行查詢通過ADB返回它就好
public boolean isTaskChecked(long taskID){
SQLiteDatabase db = getReadableDatabase();
String[] columns = {ID, CHECKED};
Cursor c = db.query(TASKS, columns, "_id="+taskID, null, null, null, null);
c.moveToFirst();
int boolAsInt = c.getInt(1); //This line is throwing.
//db.close();
c.close();
if (boolAsInt==1) {
return true;
} else if (boolAsInt==0) {
return false;
} else {
panicButton();
}
return false;
}
:但是,執行代碼只是拋出此異常:
06-28 19:49:45.881: E/AndroidRuntime(355): FATAL EXCEPTION: main
06-28 19:49:45.881: E/AndroidRuntime(355): android.database.CursorIndexOutOfBoundsException: Index 0 requested, with a size of 0
06-28 19:49:45.881: E/AndroidRuntime(355): at android.database.AbstractCursor.checkPosition(AbstractCursor.java:580)
06-28 19:49:45.881: E/AndroidRuntime(355): at android.database.AbstractWindowedCursor.checkPosition(AbstractWindowedCursor.java:214)
06-28 19:49:45.881: E/AndroidRuntime(355): at android.database.AbstractWindowedCursor.getInt(AbstractWindowedCursor.java:84)
06-28 19:49:45.881: E/AndroidRuntime(355): at com.mowdownDevelopments.nagTasks.NagTasksDatabaseHelper.isTaskChecked(NagTasksDatabaseHelper.java:239)
06-28 19:49:45.881: E/AndroidRuntime(355): at com.mowdownDevelopments.nagTasks.NagTaskListFragment.onPrepareActionMode(NagTaskListFragment.java:184)
06-28 19:49:45.881: E/AndroidRuntime(355): at com.actionbarsherlock.internal.ActionBarSherlockCompat$ActionModeCallbackWrapper.onPrepareActionMode(ActionBarSherlockCompat.java:1181)
06-28 19:49:45.881: E/AndroidRuntime(355): at com.actionbarsherlock.internal.app.ActionBarImpl$ActionModeImpl.invalidate(ActionBarImpl.java:713)
06-28 19:49:45.881: E/AndroidRuntime(355): at com.actionbarsherlock.internal.app.ActionBarImpl.startActionMode(ActionBarImpl.java:405)
06-28 19:49:45.881: E/AndroidRuntime(355): at com.actionbarsherlock.internal.ActionBarSherlockCompat.startActionMode(ActionBarSherlockCompat.java:178)
06-28 19:49:45.881: E/AndroidRuntime(355): at com.actionbarsherlock.app.SherlockFragmentActivity.startActionMode(SherlockFragmentActivity.java:50)
06-28 19:49:45.881: E/AndroidRuntime(355): at com.mowdownDevelopments.nagTasks.NagTaskListFragment.onListItemClick(NagTaskListFragment.java:62)
06-28 19:49:45.881: E/AndroidRuntime(355): at android.support.v4.app.ListFragment$2.onItemClick(ListFragment.java:58)
06-28 19:49:45.881: E/AndroidRuntime(355): at android.widget.AdapterView.performItemClick(AdapterView.java:284)
06-28 19:49:45.881: E/AndroidRuntime(355): at android.widget.ListView.performItemClick(ListView.java:3382)
06-28 19:49:45.881: E/AndroidRuntime(355): at android.widget.AbsListView$PerformClick.run(AbsListView.java:1696)
06-28 19:49:45.881: E/AndroidRuntime(355): at android.os.Handler.handleCallback(Handler.java:587)
06-28 19:49:45.881: E/AndroidRuntime(355): at android.os.Handler.dispatchMessage(Handler.java:92)
06-28 19:49:45.881: E/AndroidRuntime(355): at android.os.Looper.loop(Looper.java:123)
06-28 19:49:45.881: E/AndroidRuntime(355): at android.app.ActivityThread.main(ActivityThread.java:4627)
06-28 19:49:45.881: E/AndroidRuntime(355): at java.lang.reflect.Method.invokeNative(Native Method)
06-28 19:49:45.881: E/AndroidRuntime(355): at java.lang.reflect.Method.invoke(Method.java:521)
06-28 19:49:45.881: E/AndroidRuntime(355): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
06-28 19:49:45.881: E/AndroidRuntime(355): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
06-28 19:49:45.881: E/AndroidRuntime(355): at dalvik.system.NativeStart.main(Native Method)
,其中指出的問題在這兒。 (我在那裏使用了一個泛型查詢,但select _id, ischecked from tasks where _id=1;
也工作得很好。)我不明白爲什麼它說我在索引0時請求索引0,當代碼明確要求列索引1時,以及在執行在一個shell中的查詢給了我一些可行的東西(並且不是基於大小零的?)。任何人都可以幫我調試嗎?
[編輯:]所以,事實證明,問題是,對於這個特殊問題,我總是從不同的班級傳球-1。我很抱歉浪費大家的時間。
我已經得到了使用中的SQL查詢相匹配的'rawquery'此錯誤這個問題,用一個數字代替變量。我不應該得到一個空集。 – MowDownJoe 2012-07-13 00:16:24