Add a floating action button

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A floating action button (FAB) is a circular button that triggers the primary action in your app's UI. This document shows how to add a FAB to your layout, customize some of its appearance, and respond to button taps.

To learn more about how to design a FAB for your app according to the Material Design Guidelines, see Material Design FAB .

An image showing an app screen containing a red FloatingActionButton
Figure 1. A floating action button (FAB).

Add the floating action button to your layout

The following code shows how the FloatingActionButton appears in your layout file:

        android:layout_margin="16dp" />

By default, a FAB is colored by the colorAccent attribute, which you can customize with the theme's color palette.

You can configure other FAB properties using XML attributes or corresponding methods, such as the following:

  • The size of the FAB, using the app:fabSize attribute or the setSize() method
  • The ripple color of the FAB, using the app:rippleColor attribute or the setRippleColor() method
  • The FAB icon, using the android:src attribute or the setImageDrawable() method

Respond to button taps

You can then apply an View.OnClickListener to handle FAB taps. For example, the following code displays a Snackbar when the user taps the FAB:


val fab: View = findViewById(
fab.setOnClickListener { view ->
    Snackbar.make(view, "Here's a Snackbar", Snackbar.LENGTH_LONG)
            .setAction("Action", null)


FloatingActionButton fab = findViewById(;
fab.setOnClickListener(new View.OnClickListener() {
    public void onClick(View view) {
        Snackbar.make(view, "Here's a Snackbar", Snackbar.LENGTH_LONG)
                .setAction("Action", null).show();

For more information about the capabilities of the FAB, see the API reference for the FloatingActionButton.