根据电话号码获取联系人姓名

以下是根据一个已知的电话号码，从通讯录中获取相对应的联系人姓名的代码：

public String getContactNameFromPhoneBook(Context context, String phoneNum) {
    String contactName = "";
    ContentResolver cr = context.getContentResolver();
    Cursor pCur = cr.query(
            ContactsContract.CommonDataKinds.Phone.CONTENT_URI, null,
            ContactsContract.CommonDataKinds.Phone.NUMBER + " = ?",
            new String[] { phoneNum }, null);
    if (pCur.moveToFirst()) {
        contactName = pCur
                .getString(pCur
                        .getColumnIndex(ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME));
        pCur.close();
    }
    return contactName;
}