Android;我只有2个联系人，但我可以从查询获得5，为什么？ [英] Android; I only have 2 contacts, yet I can obtain 5 from a query, why?

问题描述

我在我的模拟器中设置了2个测试联系人。

I have setup 2 test contacts in my emulator.

我运行以下查询，应该选择它们，填充我的域对象，到列表。因此底部的输出应该是2，但是它是5，为什么是这个？ （cursor.getCount（）是5而不是2）

I'm running the following query, it should pick them both out, populate my domain object, and add to a list. The output at the bottom should therefore be 2, but it is 5, why is this? (cursor.getCount() is 5 instead of 2)

我已经走过while循环的每次迭代，并且它多次撤回同一个联系人， POSTCODE 的值，例如电话号码

I have stepped through each iteration of the while loop and it is retreving the same contact multiple times, but with different values for POSTCODE, such as the phone number

ContentResolver cr = getContentResolver();
        Cursor cursor = cr.query(ContactsContract.Data.CONTENT_URI,
                null, null, null, null);
        List<MeCercanaContact> contacts = new ArrayList<MeCercanaContact>();
        if (cursor.getCount() > 0)
        {
            while (cursor.moveToNext())
            {
                MyContact myContact = new MyContact();
                String givenName = cursor.getString(cursor.getColumnIndex(
                        ContactsContract.Contacts.DISPLAY_NAME));
                String postcode = cursor.getString(cursor.getColumnIndex(
                        ContactsContract.CommonDataKinds.StructuredPostal.POSTCODE));
                myContact.setFirstName(givenName);
                myContact.setLastName(postcode);
                contacts.add(myContact);
            }
        }
        System.out.println(contacts.size());

推荐答案

您正在查询ContactsContract.Data，容器，其中包含各种联系人详细信息（例如电话号码，邮政编码等）的列表。您必须过滤ContactsContract.Data.MIMETYPE列等于StructuredPostal.COLTENT_ITEM_TYPE的行的结果：

You are querying ContactsContract.Data, which is a generic container that holds a list of various contact details, such as phone numbers, postal codes etc.. You must filter the results for the rows whose ContactsContract.Data.MIMETYPE column equals StructuredPostal.CONTENT_ITEM_TYPE:

因此将查询更改为：

Cursor cursor = cr.query(ContactsContract.Data.CONTENT_URI,
     null, null, ContacsContract.Data.MIMETYPE +  "='" + 
ContactsContract.StructuredPostal.CONTENT_ITEM_TYPE + "'", null);

请参阅 ContactsContract.Data

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