Basically snackbar use to show message like a Toast but here the advantage is we have event to interact in it.

It shows message on the bottom of the screen. And it will remove when we swipe off.
First of all add this in your gradle file

dependencies { 
    compile fileTree(dir: 'libs', include: ['*.jar']) 
    compile 'com.android.support:appcompat-v7:23.0.1' 
    compile 'com.android.support:design:23.0.1' 
} 

We make CoordinatorLayout to our xmls parent because when we swipe off we need to remove the message.

Below is the example of simplest Snackbar.

Snackbar snackbarExample  = Snackbar .make(coordinatorLayout, "Got 
Snackbar",Snackbar.LENGTH_LONG); 
 snackbarExample.show(); 

Now Another example of snackbar with callbacks

Snackbar snackbarExample = Snackbar.make(coordinatorLayout, "Page is removed.", 
Snackbar.LENGTH_LONG) .setAction("UNDO", new View.OnClickListener() { 
            @Override 
            public void onClick(View view) { 
                Snackbar snackbarEx = Snackbar.make(coordinatorLayout, "Page is loaded.", 
Snackbar.LENGTH_SHORT); 
                snackbarEx.show(); 
            } 
        }); 
 snackbarExample.show();