private void toPreference() {
preferences.favoriteCharacter = characterName.getText().toString();
preferences.dark = dark.isChecked();
preferences.light = light.isChecked();
int checkedRadioButtonId = droid.getCheckedRadioButtonId();
if (checkedRadioButtonId >= 0) preferences.droid = DROIDS.indexOf(checkedRadioButtonId);
int checkedSpaceShipId = spaceship.getCheckedRadioButtonId();
if (checkedSpaceShipId >= 0) preferences.spaceship = SPACESHIPS.indexOf(checkedSpaceShipId);
preferences.apply();
}
