android2.0如何在联系人组中获得显示姓名和号码

身份证件 :

Cursor cur = ctx.managedQuery(ContactsContract.Data.CONTENT_URI,
             new String[] { GroupMembership.GROUP_ROW_ID,
        GroupMembership.CONTACT_ID },
        GroupMembership.GROUP_ROW_ID + "=" + String.valueOf(id),
        null, null);

if (cur.moveToFirst()) {
    int groupIdx = cur.getColumnIndex(GroupMembership.GROUP_ROW_ID);
    int personIdx = cur.getColumnIndex(GroupMembership.CONTACT_ID);

    do {
        if (cur.getLong(groupIdx) == id) {
            Cursor ccur = ctx.getContentResolver().query( Phone.CONTENT_URI,
                new String[] {Phone.NUMBER, Phone.TYPE,
                Phone.DISPLAY_NAME },
                Phone.CONTACT_ID +"="+ contactId, 
                      null, null); 
            Log.e("Test: Number", ccur.getString(0))
            Log.e("Test: Name", ccur.getString(2))
        }
    } while (cur.moveToNext());
}

但这似乎并不正确。