As the Android documentation says
Snackbars provide lightweight feedback about an operation. They show a brief message at the bottom
CoordinatorLayout coordinatorLayout=(CoordinatorLayout)findViewById(R.id.coordinatorLayout);
Snackbar snackbar = Snackbar.make(coordinatorLayout, "Text", Snackbar.LENGTH_LONG);
View view = snackbar.getView();
CoordinatorLayout.LayoutParams params=(CoordinatorLayout.LayoutParams)view.getLayoutParams();
params.gravity = Gravity.TOP;
view.setLayoutParams(params);
snackbar.show();