Android – alertdialog setbutton deprecated

I used this code in the eclipse Android project

alertDialog.setButton("OK", new DialogInterface.OnClickListener() {

        @Override
        public void onClick(DialogInterface dialog, int which) {

        }
});

But eclipse says:

resolvent:

AlertDialog alert = new AlertDialog.Builder(this).create();
            alert.setTitle("Error");
            alert.setMessage("Sorry, your device doesn't support flash light!");
            alert.setButton(Dialog.BUTTON_POSITIVE,"OK",new DialogInterface.OnClickListener(){

                @Override
                public void onClick(DialogInterface dialog, int which) {
                    finish();
                }
            });

alert.show();