final Snackbar snackbar = Snackbar.make(loginMainLayout, "نام کاربری یا کلمه عبور نادرست است", Snackbar.LENGTH_INDEFINITE); //TextView snackbarTextView = (TextView)snackbar.getView().findViewById(android.support.design.R.id.snackbar_text); //snackbarTextView.setLayoutDirection(View.LAYOUT_DIRECTION_RTL); snackbar.getView().setLayoutDirection(View.LAYOUT_DIRECTION_RTL); snackbar.getView().setTextDirection(View.TEXT_DIRECTION_RTL);
References
https://stackoverflow.com/questions/35251791/right-to-left-snackbar