Preferencescreen Android:summary Update !

In my android application I have a PreferenceScreen parent that has 3 CheckBoxPreferences as children. When I click the parent preferenceScreen, and the 3 checkboxes are displayed,

Solution 1:

Use

Parent.setSummary("string depending on the selection");
((BaseAdapter)getPreferenceScreen().getRootAdapter()).notifyDataSetChanged();

works like a charm and can be used regardless the place you change the summary.

Solution 2:

This is the correct way

Preference pref = findPreference(getString(R.string.key_of_pref));
PreferenceScreen parent = (PreferenceScreen) sf.findPreference(getString(R.string.key_of_preference_screen));
pref.setOnPreferenceChangeListener(newPreference.OnPreferenceChangeListener() {
   @OverridepublicbooleanonPreferenceChange(Preference preference, Object newValue) {
       boolean newValueBool = (Boolean) newValue;
       parent.setSummary(newValueBool ? "Summary is true" : "Summary is false");                                                  
       ((BaseAdapter) getPreferenceScreen().getRootAdapter()).notifyDataSetChanged();
       // true to update the state of the Preference with the new value// in case you want to disallow the change return falsereturntrue;
  }
});

Solution 3:

I discovered that it seems to work by following up setSummary() with getListView().invalidate()

Solution 4:

You can use BaseAdapter.notifyDataSetChanged() on the parent PreferenceScreen to update the UI. See here for example code: Update existing Preference-item in a PreferenceActivity upon returning from a (sub)PreferenceScreen

Solution 5:

If you're using support preference than go for:

findPreference("your_preference").setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener() {

            public boolean onPreferenceChange(Preference preference, Object o) {
                getListView().getAdapter().notifyDataSetChanged();
                return true;
            }
        });