android - 您如何获得联系人组的成员？

Question

我有一个联系人组的 ID，我想列出其成员。这是我正在尝试的代码:

String[] projection = new String[]{
    ContactsContract.CommonDataKinds.GroupMembership.CONTACT_ID 
};
Cursor contacts = getContentResolver().query(
        Data.CONTENT_URI,
        projection,
        ContactsContract.CommonDataKinds.GroupMembership.GROUP_ROW_ID + "=" + gid,
        null,
        null
);
String result = "";
do {
    result += contacts.getString(contacts.getColumnIndex(ContactsContract.CommonDataKinds.GroupMembership.CONTACT_ID)) + " ";
} while (contacts.moveToNext());

但这会抛出异常:

03-24 17:11:33.097: ERROR/AndroidRuntime(10730): android.database.CursorIndexOutOfBoundsException: Index -1 requested, with a size of 2
...
03-24 17:11:33.097: ERROR/AndroidRuntime(10730):     at myapp.MultiSend$1.onItemClick(MultiSend.java:83)

这是从 result += 开始的行。任何人都可以告诉我我做错了什么，或者建议一种更好的方法来获取相同的信息吗？

Answer 1

试试这个代码 fragment

String[] projection = new String[]{
    ContactsContract.CommonDataKinds.GroupMembership.CONTACT_ID 
};

Cursor contacts = getContentResolver().query(
        Data.CONTENT_URI,
        projection,
        ContactsContract.CommonDataKinds.GroupMembership.GROUP_ROW_ID + "=" + gid,
        null,
        null
);

startManagingCursor(contacts);

String result = "";

if (contacts.moveToFirst()) {    
      do {    
            try {
                result += contacts.getString(contacts.getColumnIndex(ContactsContract.CommonDataKinds.GroupMembership.CONTACT_ID)) + " ";
            } catch (Exception ex) {
                ex.printStackTrace();
            }
      } while (contacts.moveToNext());
}