java.lang.IllegalStateException : attempt to re-open an already-closed?

Question

我的 Sqlite Android 出现错误。我有这样的代码:

public int UpdatePhotoUser(String foto_user, int metode) {

        SQLiteDatabase db = this.getWritableDatabase();
        ContentValues values = new ContentValues();
        int update = 0;

        if (metode == 1) {
            values.put(Variabel.KEY_USER_PHOTO, foto_user);
            try {
                update = db.update(
                        Variabel.TABLE_USER,
                        values, null, null);
            } catch (android.database.sqlite.SQLiteException e) {

            }
        } else if (metode == 2 && getUserDetails(Variabel.KEY_USER_PHOTO).equals(foto_user)) {
            values.put(Variabel.KEY_USER_PHOTO, "");
            try {
                update = db.update(
                        Variabel.TABLE_USER,
                        values, null, null);
            } catch (android.database.sqlite.SQLiteException e) {

            }
        }

        db.close();
        return update;
    }

我在最后一行有错误:

update = db.update(
                            Variabel.TABLE_USER,
                            values, null, null);

这是错误:

Java.lang.IllegalStateException: attempt to re-open an already-closed object: SQLiteDatabase: /data/data/com.ad.kamardagang.newseditor/databases/DB_KAMAR_DAGANG
            at android.database.sqlite.SQLiteClosable.acquireReference(SQLiteClosable.java:55)
            at android.database.sqlite.SQLiteDatabase.updateWithOnConflict(SQLiteDatabase.java:1545)
            at android.database.sqlite.SQLiteDatabase.update(SQLiteDatabase.java:1522)
            at com.ad.kamardagang.newseditor.database_content.DatabaseHandler.UpdatePhotoUser(DatabaseHandler.java:613)
            at com.ad.kamardagang.newseditor.fragments.PhotoUserFragment.removeRespone(PhotoUserFragment.java:985)
            at com.ad.kamardagang.newseditor.fragments.PhotoUserFragment.access$600(PhotoUserFragment.java:62)
            at com.ad.kamardagang.newseditor.fragments.PhotoUserFragment$12.onResponse(PhotoUserFragment.java:879)
            at com.ad.kamardagang.newseditor.fragments.PhotoUserFragment$12.onResponse(PhotoUserFragment.java:875)
            at com.android.volley.toolbox.StringRequest.deliverResponse(StringRequest.java:60)
            at com.android.volley.toolbox.StringRequest.deliverResponse(StringRequest.java:30)
            at com.android.volley.ExecutorDelivery$ResponseDeliveryRunnable.run(ExecutorDelivery.java:99)
            at android.os.Handler.handleCallback(Handler.java:739)
            at android.os.Handler.dispatchMessage(Handler.java:95)
            at android.os.Looper.loop(Looper.java:135)
            at android.app.ActivityThread.main(ActivityThread.java:5254)
            at java.lang.reflect.Method.invoke(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:372)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)

已编辑:我打电话的例子:

db = new DatabaseHandler(getActivity());
 db.UpdatePhotoUser("http://a.png",1);

什么时候。我首先调用metode UpdatePhotoUser(String foto_user, int metode)，但在第二调用它的错误。那么如何解决呢？

Answer 1

问题是您在方法结束时关闭数据库:

db.close();

你不需要这样做。当不再使用应用程序时，数据库将关闭。

无论如何，有更好的方法来管理数据库。搜索有关 ContentProvider 类的教程，那里有一些有用的资源。