Android: Updating sharedPreferences Summary via listener

Question

I am having a few issues with updating the summary line in the SharedPreferences as a preference changes. I have a registered OnSharePreferenceChangeListener in the onResume(), and an unregister of the same in the onPause().

The listener is functioning, and I am able to use the onSharedPreferenceChanges() method. The issue I am having is being able to retrieve the preference there so that I can call setSummary(). I am in Ice Cream Sandwich, and it appears as though the findPreference(key) method is deprecated. So:

public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {
Preference pref = findPreference(key);}

is not functioning, and actually returns null for pref. From the examples I have seen, you need to get a preference to call setSummary() on it, and ideas?

Answer 1

You shouldn't use an onSharedPreferenceChangedListener for this.

Instead, use something similar to this.

ListPreference myPreference = (ListPreference) findPreference("preference_key");
myPreference.setOnPreferenceChangeListener(new OnPreferenceChangeListener() {
    @Override
    public boolean onPreferenceChange(Preference preference, Object newValue) {
        if (((String)newValue).equals("some_value")) {
            preference.setSummary("my summary");
        }
    }
});

findPreference is not deprecated, but rather you shouldn't be using a PreferenceActivity (that is deprecated). If you only need to support Android 3.0+ then you should switch to PreferenceFragment's, the new method. If you need to support Android 2.1+ then it is fine and you can ignore the warnings.