Http Post中的错误

Question

I m beginner in android development and I'm using using this code and use it as a method to post data in a url. i call this method from a async task.

and show error in HttpResponse

error: Caused by: java.lang.IllegalStateException: Target host must not be null, or set in parameters. scheme=null, host=null, path=192.168.56.1/android_connect/get_users.php Caused by: java.lang.IllegalStateException: Target host must not be null, or set in parameters. scheme=null, host=null, path=192.168.56.1/android_connect/get_users.php

php code:

$username = @$_POST['username'];
$password = @$_POST['password'];

$mysql_query = mysql_query(" INSERT INTO  `android_connect1`.`user` ( `username` , `password` ) VALUES ( '$username',  '$password')");

Answer 1

use single quote to query variable

$mysql_query = mysql_query(" INSERT INTO  `android_connect1`.`user` ( `username` , `password` ) VALUES ( '$username',  '$password')");

or use . (dot) to concat instead of +

$mysql_query = mysql_query(" INSERT INTO  `android_connect1`.`user` ( `username` , `password` ) VALUES ( '".$username."',  '".$password."')");

Answer 2

It seems you have a problem in the syntax after VALUES (if only this code snippet is erroneous

 $username = @$_POST['username'];
 $password = @$_POST['password'];
 $mysql_query = mysql_query(" INSERT INTO  `android_connect1`.`user` ( `username` , 
 `password` ) VALUES ( '"+$username+"',  '"+$password+"')");

Try this

 $mysql_query = mysql_query(" INSERT INTO  `android_connect1`.`user` ( `username` , 
 `password` ) VALUES ( '$username',  '$password')");

Why were you using + here ..?? The variables $username and $password have got the values which can be inserted into the DB by this simple query

Answer 3

This is a http host error.

use this

HttpPost httppost = new HttpPost("http://192.168.56.1/android_connect/get_users.php");

instead of

HttpPost httppost = new HttpPost("192.168.56.1/android_connect/get_users.php");

Answer 4

Your URL seems missing http:// try to add in prefix 192.168.56.1/android_connect/get_users.php

ex:- http://xxx.xxx.xx.x/android_connect/get_users.php