Question

I have a preferences Activity with a ListPreference on it and I use this preferences in another activity,
But I want to show a Toast whenever, user changing option in preference Activity.
For example, when user clicks on second radio button in ListPreference, suddenly a toast shown and says “second”.

Answer 1

What is the problem?

Resolve the preference and set a listener that does the toast?
Something like this for example

ListPreference listPreference = findPreference(key);
    listPreference.setOnPreferenceChangeListener(new OnPreferenceChangeListener() {
        @Override
        public boolean onPreferenceChange(Preference preference, Object newValue) {
            Toast.makeText(SettingsActivity.this, "second", Toast.LENGTH_LONG).show();
            return true;
        }
    });