How to Set the Size to FloatingActionButton In Flutter?

The floating Action Button represents the primary action of the screen and generally located at the right bottom of the screen. In today’s article, we will go through how to set the size to FloatingActionButton in Flutter.

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We’ll cover all the necessary steps, from installing Flutter and setting up your development environment to creating a new Flutter project using the Flutter CLI. You’ll learn how to configure your project, structure your codebase, and utilize Flutter’s powerful UI framework to build beautiful and responsive applications.

Set a Size to FloatingActionButton In Flutter

Use a Container where you can specify width and height, then use a RawMaterialButton, like this:

myFabButton = Container(
      width: 200.0,
      height: 200.0,
      child: new RawMaterialButton(
        shape: new CircleBorder(),
        elevation: 0.0,
        child: Icon(
          Icons.favorite,
          color: Colors.blue,
         ),
      onPressed: (){},
  );

Wrap your FAB with a FittedBox inside a Container or SizedBox and then change the width and the height of it.

floatingActionButton: Container(
        height: 100.0,
        width: 100.0,
        child: FittedBox(
          child: FloatingActionButton(onPressed: () {}),
        ),
      ),

We will get output like a below:

You can wrap your button with a Transform.scale() widget:

floatingActionButton: Transform.scale(
  scale: 1.5,
  child: FloatingActionButton(onPressed: () {}),
)

Use a SizedBox Widget

SizedBox(
  width: 200.0,
  height: 200.0,
  child: FloatingActionButton(
    onPressed: () {},
  ),
)

You can also use RawMaterialButton like a below:

RawMaterialButton(
  elevation: 2.0,
  shape: CircleBorder(),
  fillColor: Colors.red,
  onPressed: (){},
  child: Icon(
    Icons.add,
    color: Colors.white,
    size: 20.0,
  ),
  constraints: BoxConstraints.tightFor(
    width: 56.0,
    height: 56.0,
  ),
)

Instead of using regular FloatingActionButton() use FloatingActionButton.extended()
```
FloatingActionButton.extended(
  onPressed: () {},
  icon: Icon(Icons.save),
  label: Text("DOWNLOAD"),
),
```
We will get output like a below:

Floating Action Button
This makes FAB 40 logical pixels wide and tall compared to its original size of 56.
```
FloatingActionButton(
  mini: true, // set it to true
  onPressed: () {},
)
```
We have to apply generic solutions here, which should be constant in all the UI.
```
Scaffold(
      floatingActionButton: Container(
        height: MediaQuery.of(context).size.width * 0.2, 
        width: MediaQuery.of(context).size.width * 0.2,
        child: FloatingActionButton(onPressed: () {}),
      ),
```
Set width and height using MediaQuery which will be the same across the devices. The above code will give us output like a below:

Floating Action Button Widget

Here is an Extra tip of the day for you :

Why Should Mobile App Startups Choose Flutter…Flutter uses its own graphics rendering engine called Skia which is google’s performance graphics engine.

This gives you complete control over the entire pixels which are present on the screen, opening the door to new possibilities. Continue reading on Think Technologies.

Conclusion:

Hope you have learned from this article !!!

Keep Learning!!! Keep Fluttering !!!

So in this article, we have been through how to set the size to FloatingActionButton in flutter.

Do not forget to drop your valuable suggestions/feedback. We would love to assist you.

Written by Nirali Patel

Nirali Patel is a dedicated Flutter developer with over two years of experience, specializing in creating seamless mobile applications using Dart. With a passion for crafting user-centric solutions, Nirali combines technical proficiency with innovative thinking to push the boundaries of mobile app development.