android - 在android ListView 中获取联系人姓名和生日

Question

我正在尝试获取包含所有联系人姓名和生日的 ListView :

在我的 oncreate() 中:

final ListView listview = (ListView) findViewById(R.id.ListView1);
Cursor cursor=getContactsBirthdays();
SimpleCursorAdapter adapter=new SimpleCursorAdapter(this,
    android.R.layout.two_line_list_item, cursor, 
    new String[] {ContactsContract.Contacts.DISPLAY_NAME, 
                  ContactsContract.CommonDataKinds.Event.START_DATE},
    new int[]{android.R.id.text1, android.R.id.text2});
listview.setAdapter(adapter);

我的 getContactsBirthdays() 方法:

private Cursor getContactsBirthdays() {
        try {
            Uri uri = ContactsContract.Data.CONTENT_URI;

            String[] projection = new String[] {
                    ContactsContract.Contacts.DISPLAY_NAME,
        //          ContactsContract.CommonDataKinds.Event.CONTACT_ID,
                    ContactsContract.CommonDataKinds.Event.START_DATE
            };

            String where = ContactsContract.Data.MIMETYPE + "= ? AND " +
                           ContactsContract.CommonDataKinds.Event.TYPE + "=" + 
                           ContactsContract.CommonDataKinds.Event.TYPE_BIRTHDAY;
            String sortOrder = ContactsContract.Contacts.DISPLAY_NAME + " COLLATE LOCALIZED ASC";
            return managedQuery(uri, projection, where, null, sortOrder);
        } catch (Exception e) {
            Log.e("Contact Error", "Error: " + e.getMessage());
            return null;
        }
    }

但我有一个非法参数异常:列'_id'不存在当我创建适配器时。

谁能解释一下为什么？

Answer 1

来自 the docs for CursorAdapter (SimpleCursorAdapter 扩展):

The Cursor must include a column named "_id" or this class will not work.