Something like this:
((SeekBarPreference) findPreference(R.id.preference_delay_seek_bar)).setOnPreferenceChangeListener(new OnPreferenceChangeListener() {
@Override
public boolean onPreferenceChange(Preference preference, Object newValue) {
final int progress = Integer.valueOf(String.valueOf(newValue));
preference.setSummary(String.format("My progress value: %d", progress));
}
});