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The Flutter GetX Ecosystem

Responsive Widgets and Screen Utilities

Explore how to create responsive Flutter applications using GetX by learning to build adaptive UIs that adjust layouts automatically for desktop, tablet, phone, and watch. Understand key widgets and utilities like GetResponsiveView, ResponsiveScreen, and responsiveValue to manage screen sizes and customize layouts efficiently.

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The need for responsiveness

Modern applications aren’t limited to just one type of screen. We use apps on our computers, phones, and even wearable devices. This becomes even more evident when we talk about Flutter, the framework that lets us deploy apps to any platform.

So, developers need to make their apps responsive so that they look good on every device and screen size. GetX helps us achieve responsiveness easily with its structured API and utilities, which give us the necessary information.

One widget, multiple layouts

GetResponsiveView is a widget that lets us build different layouts for different screen sizes, all in one class. Screen sizes are categorized by the relevant device names and each one has a corresponding method. We can return a different layout in each of these methods, and when the app window is resized, or the app is opened on a device of a different screen size, the relevant layout is rendered automatically. For example, we can have a detailed UI for the desktop app, and a minimal one for the mobile app.

Here’s what the GetResponsiveView widget looks like:

Dart
class MyResponsiveWidget extends GetResponsiveView {
  @override
  Widget? desktop() {
    // return desktop layout
  }
  @override
  Widget? tablet() {
    // return tablet layout
  }
  @override
  Widget? phone() {
    // return phone layout
  }
  @override
  Widget? watch() {
    // return watch layout
  }
}

Depending on the screen size, the widget automatically changes its layout as declared in these methods.

Specifying the default layout with the builder method

We also get a builder method that the system defaults to in case we don’t specify a widget for a particular screen size. So if we miss out filling the watch method, for example, the builder method will take its place.

Dart
@override
Widget? builder() {
  // return default layout
}

It is necessary to use at least one of these methods, all of them cannot be null at the same time.

If we want to render only the builder method irrespective of the screen size, we can do that by setting the ...