Floating Action Button:

floatingActionButton: It is a button displayed at the bottom right corner and floating above the body. It is a circular icon button that floats over the content of a screen at a fixed place to promote a primary action in the application. While scrolling the page, its position cannot be changed. It uses the FloatingActionButton widget properties using Scaffold.floatingActionButton. See the below code:

Widget build(BuildContext context) {   
         return Scaffold(   
    appBar: AppBar(title: Text('First Flutter Application')),   
    body: Center(   
        child: Text("Welcome to Javatpoint!!"),   
    ),   
    floatingActionButton: FloatingActionButton(   
        elevation: 8.0,   
        child: Icon(Icons.add),   
        onPressed: (){   
           print('I am Floating Action Button');  
        }   
    );   
}  

In the above code, we have used the elevation property that gives a shadow effect to the button. We have also used the Icon widget to give an icon to the button using preloaded Flutter SDK icons. The onPressed() property will be called when the user taps the button, and the statements “I am Floating Action Button” will be printed on the console.