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查询数据库后，我正在尝试通过游标对象从数据库中检索数据。我的 cursor.close() 和关闭数据库时似乎出现错误。这一直很好，但是当我从不同的意图访问类时，我开始收到“游标终结器”错误。

目前，我的光标对象似乎以不正确的方式关闭。

作为一个例子，我如何尝试检索所有数据以在我的类的 onCreate 方法中填充列表视图。

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);


setContentView(R.layout.appointmentview);


    searchedAppView = (ListView)findViewById(android.R.id.list);

    DBHandlerApp DBAppointments = new DBHandlerApp(this, null, null);

    DBHandlerApp searchApps = new DBHandlerApp(this, null, null);

    searchApps.open();


    Cursor cursor = searchApps.getAppointmentsData();

    startManagingCursor(cursor);


    @SuppressWarnings("static-access")
    String [] from = new String [] {DBAppointments.KEY_NAMEAPP, DBAppointments.KEY_TYPEAPP, DBAppointments.KEY_TIMEAPP, DBAppointments.KEY_DATEAPP, DBAppointments.KEY_COMMENTAPP};
    int [] to = new int [] {R.id.txtAppointName, R.id.txtAppointType, R.id.txtAppointTime, R.id.txtAppointDate, R.id.txtAppointCom};

    @SuppressWarnings("deprecation")

    SimpleCursorAdapter cursorAdapter = new SimpleCursorAdapter(this, R.layout.setappointviews, cursor, from, to);
    searchedAppView.setAdapter(cursorAdapter);



    searchAppoints = (ImageButton) findViewById(R.id.btnSearchAppointName); 
    searchAppName = (EditText) findViewById(R.id.inputAppointName); 


    searchAppoints.setOnClickListener(this);

}

下面是 DBHandlerApp 类的方法“getAppointmentData”：

    public Cursor getAppointmentsData() {
        String [] columns = new String[]{KEY_ROWAPPID, KEY_NAMEAPP, KEY_TYPEAPP, KEY_TIMEAPP, KEY_DATEAPP, KEY_COMMENTAPP};
        Cursor c = ourDatabase.query(DATABASE_TABLEAPP, columns, null, null, null, null, KEY_NAMEAPP + " ASC", null);

                    //*****Closing the cursor object.*****
        c.close();
        return c;

日志错误：

01-31 17:44:34.220: E/AndroidRuntime(269): FATAL EXCEPTION: main
01-31 17:44:34.220: E/AndroidRuntime(269): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.flybase2/com.example.flybase2.ViewAppointments}: java.lang.IllegalStateException: attempt to re-open an already-closed object: android.database.sqlite.SQLiteQuery (mSql = SELECT _id, app_name, app_type, app_time, app_date, app_comments FROM appointmentsTable ORDER BY app_name ASC) 
01-31 17:44:34.220: E/AndroidRuntime(269):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663)
01-31 17:44:34.220: E/AndroidRuntime(269):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
01-31 17:44:34.220: E/AndroidRuntime(269):  at android.app.ActivityThread.access$2300(ActivityThread.java:125)
01-31 17:44:34.220: E/AndroidRuntime(269):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
01-31 17:44:34.220: E/AndroidRuntime(269):  at android.os.Handler.dispatchMessage(Handler.java:99)
01-31 17:44:34.220: E/AndroidRuntime(269):  at android.os.Looper.loop(Looper.java:123)
01-31 17:44:34.220: E/AndroidRuntime(269):  at android.app.ActivityThread.main(ActivityThread.java:4627)
01-31 17:44:34.220: E/AndroidRuntime(269):  at java.lang.reflect.Method.invokeNative(Native Method)
01-31 17:44:34.220: E/AndroidRuntime(269):  at java.lang.reflect.Method.invoke(Method.java:521)
01-31 17:44:34.220: E/AndroidRuntime(269):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
01-31 17:44:34.220: E/AndroidRuntime(269):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
01-31 17:44:34.220: E/AndroidRuntime(269):  at dalvik.system.NativeStart.main(Native Method)
01-31 17:44:34.220: E/AndroidRuntime(269): Caused by: java.lang.IllegalStateException: attempt to re-open an already-closed object: android.database.sqlite.SQLiteQuery (mSql = SELECT _id, app_name, app_type, app_time, app_date, app_comments FROM appointmentsTable ORDER BY app_name ASC) 
01-31 17:44:34.220: E/AndroidRuntime(269):  at android.database.sqlite.SQLiteClosable.acquireReference(SQLiteClosable.java:34)
01-31 17:44:34.220: E/AndroidRuntime(269):  at android.database.sqlite.SQLiteQuery.fillWindow(SQLiteQuery.java:64)
01-31 17:44:34.220: E/AndroidRuntime(269):  at android.database.sqlite.SQLiteCursor.fillWindow(SQLiteCursor.java:283)
01-31 17:44:34.220: E/AndroidRuntime(269):  at android.database.sqlite.SQLiteCursor.getCount(SQLiteCursor.java:264)
01-31 17:44:34.220: E/AndroidRuntime(269):  at android.support.v4.widget.CursorAdapter.getCount(CursorAdapter.java:202)
01-31 17:44:34.220: E/AndroidRuntime(269):  at android.widget.ListView.setAdapter(ListView.java:436)
01-31 17:44:34.220: E/AndroidRuntime(269):  at com.example.flybase2.ViewAppointments.onCreate(ViewAppointments.java:54)
01-31 17:44:34.220: E/AndroidRuntime(269):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
01-31 17:44:34.220: E/AndroidRuntime(269):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
01-31 17:44:34.220: E/AndroidRuntime(269):  ... 11 more

目前我不使用 .searchApps.close(); 关闭数据库。如果这样做，我会收到以下 logcat 错误：

01-31 17:52:17.324: E/AndroidRuntime(277): FATAL EXCEPTION: main
01-31 17:52:17.324: E/AndroidRuntime(277): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.flybase2/com.example.flybase2.ViewAppointments}: java.lang.IllegalStateException: attempt to re-open an already-closed object: android.database.sqlite.SQLiteQuery (mSql = SELECT _id, app_name, app_type, app_time, app_date, app_comments FROM appointmentsTable ORDER BY app_name ASC) 
01-31 17:52:17.324: E/AndroidRuntime(277):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663)
01-31 17:52:17.324: E/AndroidRuntime(277):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
01-31 17:52:17.324: E/AndroidRuntime(277):  at android.app.ActivityThread.access$2300(ActivityThread.java:125)
01-31 17:52:17.324: E/AndroidRuntime(277):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
01-31 17:52:17.324: E/AndroidRuntime(277):  at android.os.Handler.dispatchMessage(Handler.java:99)
01-31 17:52:17.324: E/AndroidRuntime(277):  at android.os.Looper.loop(Looper.java:123)
01-31 17:52:17.324: E/AndroidRuntime(277):  at android.app.ActivityThread.main(ActivityThread.java:4627)
01-31 17:52:17.324: E/AndroidRuntime(277):  at java.lang.reflect.Method.invokeNative(Native Method)
01-31 17:52:17.324: E/AndroidRuntime(277):  at java.lang.reflect.Method.invoke(Method.java:521)
01-31 17:52:17.324: E/AndroidRuntime(277):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
01-31 17:52:17.324: E/AndroidRuntime(277):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
01-31 17:52:17.324: E/AndroidRuntime(277):  at dalvik.system.NativeStart.main(Native Method)
01-31 17:52:17.324: E/AndroidRuntime(277): Caused by: java.lang.IllegalStateException: attempt to re-open an already-closed object: android.database.sqlite.SQLiteQuery (mSql = SELECT _id, app_name, app_type, app_time, app_date, app_comments FROM appointmentsTable ORDER BY app_name ASC) 
01-31 17:52:17.324: E/AndroidRuntime(277):  at android.database.sqlite.SQLiteClosable.acquireReference(SQLiteClosable.java:34)
01-31 17:52:17.324: E/AndroidRuntime(277):  at android.database.sqlite.SQLiteQuery.fillWindow(SQLiteQuery.java:64)
01-31 17:52:17.324: E/AndroidRuntime(277):  at android.database.sqlite.SQLiteCursor.fillWindow(SQLiteCursor.java:283)
01-31 17:52:17.324: E/AndroidRuntime(277):  at android.database.sqlite.SQLiteCursor.getCount(SQLiteCursor.java:264)
01-31 17:52:17.324: E/AndroidRuntime(277):  at android.support.v4.widget.CursorAdapter.getCount(CursorAdapter.java:202)
01-31 17:52:17.324: E/AndroidRuntime(277):  at android.widget.ListView.setAdapter(ListView.java:436)
01-31 17:52:17.324: E/AndroidRuntime(277):  at com.example.flybase2.ViewAppointments.onCreate(ViewAppointments.java:56)
01-31 17:52:17.324: E/AndroidRuntime(277):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
01-31 17:52:17.324: E/AndroidRuntime(277):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
01-31 17:52:17.324: E/AndroidRuntime(277):  ... 11 more
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2 回答 2

1

您将光标关闭在错误的位置。您应该在完全使用完游标后关闭它，在填充它之后立即关闭它，然后从您的getAppointmentData方法返回它。

简单地close从该方法中删除调用应该可以解决您的问题，因为当您使用 时startManagingCursor，活动会处理关闭它。

顺便说一句，startManagingCursor折旧有利于使用Loaders。

于 2013-01-31T18:18:26.830 回答
0

我不完全知道问题是什么。但是，该方法startManagingCursor(...)已弃用，不应使用，请参阅：http: //developer.android.com/reference/android/app/Activity.html#startManagingCursor(android.database.Cursor)

更好的方法是使用CursorLoader.

于 2013-01-31T18:16:22.167 回答