I have no experience in Android apps, can someone help me write such a small script?

What I need? I need an Android app to run in background and display a number in status bar of my Android phone.

So my app needs this:

1. I should be able to add URL to my app, example: example.com/returnstring.php
2. App will run in background and will query that URL (it will return string of 1-5 chars, example: 3.445)
3. App should display this value in status bar (3.445)
4. App should repeat step 2-3 every minute

That’s all. Can someone tell me how to do it?

Here they said to do this, you should convert text to bitmap and then bitmap to icon and display it in status bar:

How do I show text in android system status bar