> SQLite Android Database Cursor window allocation of 2048 kb failed
> Could not allocate CursorWindow
> Out of Memory when allocating cursors
> Android SQLite CursorWindowAllocationException crash

他们都建议游标在使用后必须关闭.但这并没有解决我的问题.这是我的代码：

String query = "select serial from tbl1 union select serial from tbl2 union select serial from tbl3";
    sqliteDatabase db = null;
    Cursor cur = null;
    try {
        SettingsDatabaseHelper dal = new SettingsDatabaseHelper(
                c);
        db = dal.getReadableDatabase();
        cur = db.rawQuery(query,null);
        int numRows = cur.getCount();
        if (numRows > 0) {
            cur.moveToFirst();

            int serialIdx = cur.getColumnIndexOrThrow("serial");
            for (boolean hasItem = cur.moveToFirst(); hasItem; hasItem = cur
                    .moveToNext()) {

                String serial = cur.getString(serialIdx);
                if (Validator.getInstance().isValidSerial(serial))
                    serials.add(serial);

            }
        }
    } finally {
        if (cur != null)
            cur.close();

        if (db != null)
            db.close();
    }

我每隔几秒钟运行一次这个方法.半小时后,我在int numRows = cur.getCount()中得到CursorWindowAllocationException;然后我的服务停止.

由于我关闭游标,所以我的Helper类可能有问题.这是代码：

public class SettingsDatabaseHelper extends sqliteOpenHelper {

    private static final String DATABASE_NAME = "mydb.db";
    private static final int DATABASE_VERSION = 1;


    private static final String TBL_CREATE="create table...";



    public SettingsDatabaseHelper(Context context) {
        super(context,DATABASE_NAME,null,DATABASE_VERSION);
    }

    @Override
    public void onCreate(sqliteDatabase database) {
        database.execsql(TBL_CREATE);
    }

    @Override
    public void onUpgrade(sqliteDatabase db,int oldVersion,int newVersion) {
        onCreate(db);
    }
}

如何防止这个异常被抛出？