我的应用程序中有很多Cursor,我正在尝试清楚地管理它们。 我按照tutos的说法做了:最后关闭它们。 但是,在我的带有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.
我在互联网上看到一些答案,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。 这是我使用游标的函数:
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;
}
正如你所看到的,我试图使用“startManagingCursor”,但它甚至更糟...... 有没有人面对这个并最终解决了它? 我应该使用LoaderManager吗?
答案 0 :(得分:1)
根据android文档
警告:不要对使用此方法获得的游标调用close(), 因为活动会在适当的时候为你做。 但是,如果从a上的光标上调用stopManagingCursor(Cursor) 托管查询,系统不会自动关闭光标, 在这种情况下,您必须调用close()。
所以请尝试删除代码中的cursor.close();
。
答案 1 :(得分:0)
我正在研究代码,无法找到onResume的开头/ startmanaging /重新创建cursores。我会在这里寻找错误。
答案 2 :(得分:0)
你有两个选项可以使用activity方法startManagingCursor(...),或者你只是停止尝试使用onResume()中关闭或为空的cusor做某事。
答案 3 :(得分:0)
答案是:
manageQuery只需打开一个MANAGED游标(一个随StartManagingCursor提供的游标)。因此,游标不需要关闭。
但是,因为在我们的应用程序中我们使用了超过1个游标,所以使用托管游标很糟糕,因此我们使用“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Query而不是ManagedQuery ......
答案 4 :(得分: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();
}