Android中 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;
	}