How to dismiss a Snackbar using it's own Action button?

For Java,

The .make method returns a Snackbar object. Save an instance of that object by making it final. Then, in the onClick(), call .dismiss:

final Snackbar snackBar = Snackbar.make(findViewById(android.R.id.content), "Snackbar Message", Snackbar.LENGTH_LONG);

        snackBar.setAction("Action Message", new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                // Call your action method here
                snackBar.dismiss();
            }
        });
        snackBar.show();

For Kotlin,

        Snackbar.make(
            findViewById(android.R.id.content),
            "Snackbar Message",
            Snackbar.LENGTH_INDEFINITE
        ).setAction("Action Message") {
            // Call action functions here
        }.show()

Implement a click action and let it empty . Clicking on empty click action will dismiss snackbar .

Snackbar.make(coordinatorLayoutView, "Service Enabled", Snackbar.LENGTH_LONG)
                        .setAction("DISMISS", new View.OnClickListener() {
                            @Override
                            public void onClick(View v) {
                            }
                        })
                        .show();

When you use Snackbar.LENGTH_LONG you do not need action button for dismiss , after second automatically dismiss. You should use this code :

 Snackbar snackbar = Snackbar.make(relativeLayout, "Your Message", Snackbar.LENGTH_INDEFINITE);
            snackbar.setAction("dismiss", new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    snackbar.dismiss();
                }
            });

            snackbar.show();

Be careful this line :

Snackbar.LENGTH_INDEFINITE