你如何获得一个联络小组的成员？ [英] How do you get the members of a contact group?

问题描述

我有一个联络小组的ID，我想列出其成员。这里的code我想：

I have the ID of a contact group, and I'd like to list its members. Here's the code I'm trying:

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());

但是，这将引发异常：

But this throws an Exception:

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)

这是开始行结果+ = 。谁能告诉我，我做错了什么，或提出一个更好的方式来获得相同的信息？

which is the line starting result +=. Can anyone tell me what I'm doing wrong, or suggest a better way to get the same information?

推荐答案

试试这个code片段，希望它有助于

Try this code snippet, hope it helps

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());

}

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