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我的应用程序中有很多光标，我正在尝试清楚地管理它们。我按照 tutos 中的说明做了：最后关闭它们。但是，在我的带 ICS 的 Nexus S 上，当我恢复我的应用程序时，我崩溃了

01-23 21:52:32.125: E/AndroidRuntime(14037): Caused by: android.database.StaleDataException: Attempted to access a cursor after it has been closed.

我在网上看到一些答案说我应该使用 LoaderManager 来管理它们，但我不确定它是否适合我的情况。这是我使用光标的函数：

public static HashMap<String, Contact> getContacts(BaseActivity activity) {
    HashMap<String, Contact> contactMap = new HashMap<String, Contact>();
    ArrayList<String> allPhones =null;
    try{
        Log.d(Constants.LOGTAG,"=!=!=!=!=!=!=!=!=!=! GET CONTACTS (HashMap) =!=!=!=!=!=!=!=!=!=!=!=!=!=!");
        // Run query
        String thePhone;
        int id;
        Uri uri = ContactsContract.Contacts.CONTENT_URI;
        String[] projection = new String[] {
                ContactsContract.Contacts._ID,
                ContactsContract.Contacts.DISPLAY_NAME,
                ContactsContract.Contacts.HAS_PHONE_NUMBER };

        Cursor cursor = activity.managedQuery(uri, projection, null, null, null);
        //activity.startManagingCursor(cursor);
        if (cursor.moveToFirst()) {
            while (!cursor.isAfterLast()) {
                id = cursor.getInt(0);
                if (cursor.getInt(2) == 1) {

                    Contact c = new Contact(id, cursor.getString(1),null,getAllPhoneNumber(activity, id));
                    Contact c2 = new Contact(id, cursor.getString(1),null,getAllPhoneNumber(activity, id));
                    allPhones = c.getPhoneNumber();
                    for(String phone:allPhones){
                        thePhone = phone;
                        c2.getPhoneNumber().clear();
                        c2.setIndicatif("+33");
                        thePhone = thePhone.replaceAll(" ", "");

                        if(thePhone.startsWith("00")){//On vire le 0033
                            thePhone = thePhone.substring(4);
                        }
                        else if(thePhone.startsWith("+")){//On vire le +33
                            thePhone =thePhone.substring(3);
                        }
                        if(thePhone.startsWith("0")){
                            thePhone = thePhone.substring(1);
                        }
                        //c.getPhoneNumber().add(thePhone);
                        c2.getPhoneNumber().add(thePhone);
                        contactMap.put(thePhone,c2);
                    }
                }
                cursor.moveToNext();
            }
        }
        cursor.close();
    }catch (Exception e) {
        e.printStackTrace();
    }
    Whosupp.setAdresseBookHM(contactMap);
    return contactMap;
}

/**
 * Obtains the contact list from the Adress Book for the currently selected account SORTED BY NAME
 * 
 * @return a list of all contact.
 */
public static ArrayList<Contact> getContactsSortedByName(BaseActivity activity) {
    ArrayList<Contact> contactList = new ArrayList<Contact>();
    ArrayList<String> allPhones =null;
    try{
        Log.d(Constants.LOGTAG,"=!=!=!=!=!=!=!=!=!=! GET CONTACTS (ArrayList) =!=!=!=!=!=!=!=!=!=!=!=!=!=!");
        // Run query
        String thePhone;
        Uri uri = ContactsContract.Contacts.CONTENT_URI;
        String[] projection = new String[] {
                ContactsContract.Contacts._ID,
                ContactsContract.Contacts.DISPLAY_NAME,
                ContactsContract.Contacts.HAS_PHONE_NUMBER };

        String sortOrder = ContactsContract.Contacts.DISPLAY_NAME
                + " COLLATE LOCALIZED ASC";

        Cursor cursor = activity.managedQuery(uri, projection, null, null, sortOrder);
        //activity.startManagingCursor(cursor);
        if (cursor.moveToFirst()) {
            while (!cursor.isAfterLast()) {
                int id = cursor.getInt(0);
                if (cursor.getInt(2) == 1) {


                    Contact c = new Contact(id, cursor.getString(1),null,getAllPhoneNumber(activity, id));

                    allPhones = c.getPhoneNumber();
                    for(String phone:allPhones){
                        thePhone = phone;
                        c.getPhoneNumber().clear();
                        c.setIndicatif("+33");
                        thePhone = thePhone.replaceAll(" ", "");

                        if(thePhone.startsWith("00")){//On vire le 0033
                            thePhone = thePhone.substring(4);
                        }
                        else if(thePhone.startsWith("+")){//On vire le +33
                            thePhone =thePhone.substring(3);
                        }
                        if(thePhone.startsWith("0")){
                            thePhone = thePhone.substring(1);
                        }
                        //c.getPhoneNumber().add(thePhone);

                        contactList.add(c);
                    }
                }
                cursor.moveToNext();
            }
        }
        cursor.close();
    }catch (Exception e) {
        e.printStackTrace();
    }

    return contactList;
}

/**
 * Get the first phone number of a contact
 * 
 * @param contactId
 *            the contact's id
 * @return the first phone number of the contact ! 
 */
public static ArrayList<String> getFirstPhoneNumber(BaseActivity activity, int contactId) {
    final String[] projection = new String[] { Phone.NUMBER };
    ArrayList<String>  number=new ArrayList<String>();
    Cursor phone = activity.managedQuery(Phone.CONTENT_URI, projection,
            Data.CONTACT_ID + "=?",
            new String[] { String.valueOf(contactId) }, null);
    //activity.startManagingCursor(phone);

    if (phone.moveToFirst()) {
        number.add(phone.getString(phone.getColumnIndex(Phone.NUMBER)));
    }
    phone.close();
    return number;
}

/**
 * Get all phone number of a contact
 * 
 * @param contactId
 *            the contact's id
 * @return a list of all phone number of the contact
 */
public static ArrayList<String> getAllPhoneNumber(BaseActivity activity, int contactId) {
    final String[] projection = new String[] { Phone.NUMBER };
    String number = "";
    Cursor phone = activity.managedQuery(Phone.CONTENT_URI, projection,
            Data.CONTACT_ID + "=?",
            new String[] { String.valueOf(contactId) }, null);
    //activity.startManagingCursor(phone);
    ArrayList<String> phoneNumber = new ArrayList<String>();

    if (phone.moveToFirst()) {
        final int contactNumberColumnIndex = phone.getColumnIndex(Phone.NUMBER);

        while (!phone.isAfterLast()) {
            number = phone.getString(contactNumberColumnIndex);
            if(number.contains("305875"))               Log.d(Constants.LOGTAG,"I'm here "+number);
            phoneNumber.add(number);
            phone.moveToNext();
        }
    }
    phone.close();
    return phoneNumber;
}

如您所见，我尝试使用“startManagingCursor”，但更糟糕的是......有没有人遇到过这个问题并最终解决了它？我应该使用 LoaderManager 吗？

4

5 回答 5

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根据android文档

警告：不要在使用此方法获得的游标上调用 close()，因为活动会在适当的时候为您执行此操作。但是，如果您对托管查询中的游标调用 stopManagingCursor(Cursor)，系统将不会自动关闭游标，在这种情况下，您必须调用 close()。

所以请尝试cursor.close();在您的代码中删除。

于 2012-12-23T11:16:32.450 回答
0

您有两个选择使用活动方法 startManagingCursor(...) 或者您只是停止尝试对 onResume() 中关闭或为空的游标执行某些操作。

于 2012-01-23T22:24:14.583 回答
0

像这样写onResume()：

    @Override
    protected void onResume() {
        // TODO Auto-generated method stub
        super.onResume();
        if (!dbHelper.db.isOpen()) {
            dbHelper.open();
        }

        cursor.requery();
    }
于 2013-09-26T11:53:24.747 回答
0

我正在查看代码，但无法通过打开/开始管理/重新创建游标找到 onResume 的位置。我会在这里寻找错误。

于 2012-01-23T21:26:24.717 回答
0

这是答案：

manageQuery 只是打开一个 MANAGED 游标（随 StartManagingCursor 提供的游标）。因此游标不需要关闭。

但是，由于在我们的应用程序中我们使用超过 1 个游标，使用托管游标会很糟糕，所以我们使用“简单”游标并在完成后关闭它们。所以我们只需要做一个简单的查询而不是 ManagedQuery...

于 2012-02-02T13:29:47.543 回答