The screen is the part of your app that users actually touch. A trader in Tamale market does not see your clever code; she sees whether the button is easy to tap, whether the text is readable in sunlight and whether the screen loads quickly on her phone. Employers know this, which is why adverts ask for developers who can turn designs into clean, responsive screens.
How Flutter draws screens
In Flutter, everything you see is a widget: a piece of text, a button, an image, the padding around them, even the whole screen. You build screens by putting widgets inside other widgets, like boxes inside boxes. This is called the widget tree.
Flutter has a feature called hot reload. When your app is running on a phone or emulator and you save a change, the screen updates in about a second without restarting the app. This makes trying out layouts fast and fun.
Design for the phones people really have
Many apps are designed on large, expensive phones and then fail on the phones most people in northern Ghana use. Before you build, picture your real user:
- a small screen, perhaps 5 or 6 inches
- a phone with limited memory and storage, often shared with family
- bright sunlight, so contrast matters
- large text turned on because the user prefers it
- a slow or expensive data connection
Design for that phone first. If your app works well there, it will work well on bigger phones too.