Using PHP sessions to open new android activity

Question

I have created the following PHP in order to check if some username already exists inside a database.

If it exists and the username+password is correct, I had like to open a new activity in android, for example profile page.

The PHP code looks as follows:

<?php
session_start();

$DATABASE_HOST = "XX";
$DATABASE_USER = "XX";
$DATABASE_PASS = "XX";
$DATABASE_NAME = "XX";

$con = mysqli_connect($DATABASE_HOST, $DATABASE_USER, $DATABASE_PASS, $DATABASE_NAME);
if ( mysqli_connect_errno() ) {
    die ('Failed to connect to MySQL: ' . mysqli_connect_error());
}

if ( !isset($_POST['username'], $_POST['password']) ) {
    die ('Please fill both the username and password field!');
}

if ($stmt = $con->prepare('SELECT id, password FROM accounts WHERE username = ?')) {
    $stmt->bind_param('s', $_POST['username']);
    $stmt->execute();
    $stmt->store_result();
}

if ($stmt->num_rows > 0) {
    $stmt->bind_result($id, $password);
    $stmt->fetch();
    if ($_POST['password'] === $password) {

        session_regenerate_id();
        $_SESSION['loggedin'] = TRUE;
        $_SESSION['name'] = $_POST['username'];
        $_SESSION['id'] = $id;
        echo 'Welcome ' . $_SESSION['name'] . '!';
    } else {
        echo 'Incorrect password!';
    }
} else {
    echo 'Incorrect username!';
}
$stmt->close();
?>

So basically, if the login is successful, a session named "loggedin" is created. However how can I use it in android to open new activity?

Something like:

if (session == "loggedin"){
    context.startActivity(new Intent(context, profile.class));
}

I also tried to use the echo message for example:

if ($_POST['password'] === $password) {

        session_regenerate_id();
        $_SESSION['loggedin'] = TRUE;
        $_SESSION['name'] = $_POST['username'];
        $_SESSION['id'] = $id;
        echo 'Welcome ' . $_SESSION['name'] . '!';
    } else {
        echo 'good';
    }
} else {
    echo 'bad';
}

And then in my android studio to check if the result that I read from the echo was good or bad and based on it to open activity however Im sure there are better ways.

Thank you

Answer 1

I believe what you are looking for is Deep Linking.

Here's a link that will give you a short summary

http://www.codecastra.com/deep-linking-mobile-app-website/