无法连接我的安卓应用程序到本地主机服务器

嗨，我正在开发一个android应用程序，数据库是本地主机中使用的数据库的精确副本，也就是说android db和php db中使用的字段数是相同的。我在php数据库中的任何条目都应该同步到android数据库。我正在为php端和android端编写下面的代码，请告诉我为什么无法连接。

receive_reques.php

<?php
// receive_request.php
// get the last entry from the database table
$query = "select last(Bank_Name,Account,Type,Date,Amount,Cheque_no,Cheque_party,Cheque_details) from `transaction`";
$query_run = mysql_query($query);
$response = "";
$response = mysql_fetch_row($query_run);
echo implode(":",$response);
?>

public void postData()
{
    HttpClient httpclient  = new DefaultHttpClient();

    //  calls the local host and then the receive_request file for data values
    HttpPost httppost = new HttpPost("ip_of_localhost'final_year'receive_request.php");
    try{
        HttpResponse response = httpclient.execute(httppost);
        // convert the response received to String format
        String array[] = EntityUtils.toString(response.getEntity()).split(":");
        // now store them in dbms and display them in the layout
    } catch (ClientProtocolException e) {
        // process execption
    } catch (IOException e) {
        // process execption
    }

}

我得到一个错误，说-连接到"http://ip_of_localhost/final_year_receive_request.php"拒绝