public static String getContactNameByAddr(Context context,
			String phoneNumber) {

		Uri personUri = Uri.withAppendedPath(
				ContactsContract.PhoneLookup.CONTENT_FILTER_URI,
				Uri.encode(phoneNumber));
		Cursor cur = context.getContentResolver().query(personUri,
				new String[] { PhoneLookup.DISPLAY_NAME }, null, null, null);
		if (cur.moveToFirst()) {
			int nameIdx = cur.getColumnIndex(PhoneLookup.DISPLAY_NAME);
			String name = cur.getString(nameIdx);
			cur.close();
			return name;
		}
		return phoneNumber;
	}