Custom Admin page using add_menu_page - php

Question

I have developed a plugin to write my own customized functions and its already activated. I want to add 1 page on the admin dashboard and using below code but it doesn't seem to be working
add_action('admin_menu', 'addAdminPage');
function addAdminPage() {
add_menu_page('Status Page', 'Status Menu', 'manage_options', '__FILE__', 'AdminPage', 'dashicons-wordpress',90);
}
function AdminPage() {
echo 'Hello';
}

Answer 1

You say it's not working but you haven't told us what the error is. Regardless, if you use this, it should work:
add_action( 'admin_menu', 'addAdminPage' );
function addAdminPage(){
add_menu_page(
__( 'Status Page', 'yourplugintextdomain' ),
'Status Menu',
'manage_options',
'statuspage',
'AdminPage',
'dashicons-wordpress',
90
);
}
function AdminPage(){
esc_html_e( 'Hello', 'yourplugintextdomain' );
}
You shouldn't be attempting to use the ( __FILE__ ) as the slug, so I just made it statuspage. Whenever you're writing custom functionality like this, try to prefix everything with something that relates it back to your plugin. Like: lrnr_statuspage and name your functions stuff like lrnr_AdminPage that way you reduce the risk of running into conflicts. Include your plugin or theme's text domain as well to make what you're building translation ready. It's just good practice.
Update/Correction:
I had the function name incorrect. It will work now.
Here is it running on a site I'm currently developing, I just added the above block of code to the bottom of my functions.php and added your username to the 'Hello' message.