Android从联系人那里获取电话号码，姓名和照片花费了太多时间

Question

此代码从联系人列表中获取联系人，姓名和照片，但是在获取所有这些内容时花费了太多时间。

所以我的问题是如果用户有超过500个联系人，那么它需要花费很多时间，以便如何减少其获取时间。

我在Stack Overflow上看过很多帖子但无法找到解决方案。

public void fetchContacts() {
        list = new ArrayList<PersonDetails>();

            String phoneNumber = null;
            //Uri CONTENT_URI = ContactsContract.Contacts.CONTENT_URI;
            Uri CONTENT_URI=    ContactsContract.CommonDataKinds.Phone.CONTENT_URI;
            String _ID = ContactsContract.Contacts._ID;
            String DISPLAY_NAME = ContactsContract.Contacts.DISPLAY_NAME;
            String HAS_PHONE_NUMBER = ContactsContract.Contacts.HAS_PHONE_NUMBER;
            Uri PhoneCONTENT_URI = ContactsContract.CommonDataKinds.Phone.CONTENT_URI;
            String Phone_CONTACT_ID = ContactsContract.CommonDataKinds.Phone.CONTACT_ID;
            String NUMBER = ContactsContract.CommonDataKinds.Phone.NUMBER;
            // StringBuffer output = new StringBuffer();

            String[] PROJECTION = new String[] {
                    ContactsContract.Contacts._ID,
                    ContactsContract.Contacts.DISPLAY_NAME,
                    ContactsContract.Contacts.HAS_PHONE_NUMBER, };
            String SELECTION = ContactsContract.Contacts.HAS_PHONE_NUMBER
                    + "='1'";

            ContentResolver contentResolver = getContentResolver();
            Cursor cursor = contentResolver.query(CONTENT_URI, PROJECTION,
                    SELECTION, null, null);

            // Loop for every contact in the phone
                if (cursor.getCount() > 0) {

                while (cursor.moveToNext()) {
                    //Log.e("i", i + "");
                    PersonDetails personDetails = null;
                    String contact_id = cursor.getString(cursor
                            .getColumnIndex(_ID));

                    String name = cursor.getString(cursor
                            .getColumnIndex(DISPLAY_NAME));

                    int hasPhoneNumber = Integer.parseInt(cursor
                            .getString(cursor
                                    .getColumnIndex(HAS_PHONE_NUMBER)));

                    if (hasPhoneNumber > 0) {

                        // Query and loop for every phone number of the
                        // contact
                        String Phone_Projection[] = new String[] { Phone.NUMBER };
                        Cursor phoneCursor = contentResolver.query(
                                PhoneCONTENT_URI, Phone_Projection,
                                Phone_CONTACT_ID + " = ?",
                                new String[] { contact_id }, null);

                        while (phoneCursor.moveToNext()) {

                            phoneNumber = phoneCursor.getString(phoneCursor
                                    .getColumnIndex(NUMBER));

                            // output.append("\n Phone number:" +
                            // phoneNumber);

                        }

                        phoneCursor.close();

                        if (phoneNumber != null
                                && phoneNumber.length() >= 10) {
                            Uri ur = null;
                            try {
                                Uri person = ContentUris
                                        .withAppendedId(
                                                ContactsContract.Contacts.CONTENT_URI,
                                                Long.parseLong(contact_id));
                                ur = Uri.withAppendedPath(
                                        person,
                                        ContactsContract.Contacts.Photo.CONTENT_DIRECTORY);
                            } catch (NumberFormatException e) {
                                // TODO Auto-generated catch block
                                e.printStackTrace();
                            }

                            personDetails = new PersonDetails();
                            if (name != null) {
                                personDetails.setName(name);
                            }
                            if (phoneNumber != null) {
                                //Log.e("Phone", phoneNumber);
                                personDetails.setSocialId(phoneNumber);
                            }
                            if (ur != null) {
                                //Log.e("URI", ur.toString());
                                personDetails.setPhotoUrl(ur.toString());
                            }
                            personDetails.setSocialFlag(5);
                        }

                    }
                    if (personDetails != null) {
                        list.add(personDetails);
                    }
                }

            }
            try {
                if (cursor != null) {
                    cursor.close();
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }