Android Login System with PHP,MySQL and SQLite

Download the complete project.

PHP API

[sourcecode language="php"]
<?php
require_once '../init.php';
?>
<?php
/**
* File to handle all API requests
* Accepts GET and POST
*
* Each request will be identified by TAG
* Response will be JSON data

/**
* check for POST request
*/

if (isset($_POST['tag']) && $_POST['tag'] != '')
{
$tag = $_POST['tag'];
$response = array("tag" => $tag, "success" => 0, "error" => 0);

// check for tag type
if ($tag == 'login')
{
$uname = $_POST['username'];
$password = $_POST['password'];

if ((!$uname) || (!$password))
{

$response["error"] = 1;
$response["error_msg"] = "Please Fill In Both Fields";
//echo json_encode($response);

}
else
{
$uname    = mysql_real_escape_string($uname); //Secure the string before adding to database
$password = mysql_real_escape_string($password); //Secure the string before adding to database
//$password = md5($password); // Add MD5 Hash to the password variable


global $gauthObj;
$isValid =  $gauthObj->login($uname, $password);
if($isValid)// Valid member
{
//update user login data
global $guserObj;
$guserObj->setUserId($id);
$guserObj->updateUserGeoData();

//handle user remember be option
if($remember == "yes")
{
$gauthObj-> rememberMe();
}

$response["success"] = 1;
//$response["uid"] = $guserObj->getUserId($id);
$response["user"]["name"] = $uname;
$response["user"]["password"] = $password;
//echo json_encode($response);
}
else // invalid member
{
$response["error"] = 1;
$response["error_msg"] = "Invalid username  or password";
//echo json_encode($response);

}
}
}
else
{
echo "Invalid Request";
$response["error"] = 1;
$response["error_msg"] = "Invalid Request";

}

}
else
{
echo "Access Denied";
$response["error"] = 1;
$response["error_msg"] = "Access Denied";
}
echo json_encode($response);
?>
[/sourcecode]