How to update a Preference with a SummaryProvider in a PreferenceFragmentCompat?

Question

In androidx.preference.Preference (using Version 1.1.0-beta01) it is possible to set a summary provider, which I did inside the onCreatePreferences method of a PreferenceFragmentCompat.

override fun onCreatePreferences(savedInstanceState: Bundle?, rootKey: String?) {
  ...

  val mySummaryProvider = Preference.SummaryProvider<Preference> {
     val str = preferenceManager.sharedPreferences.getString(it.key, "")
     doSomethingCool(str)
  }

  findPreference<Preference>("my_pref_id").summaryProvider = mySummarProvider
}

When I now update the preference (by using the preference editor) while the fragment is still visible, how do I notify the preference or the fragment that the summary provider should be called again (it isn't done automatically)? Unfortunately, I don't see any method or way to do that.

Answer 1

    public class SettingsClass extends PreferenceFragmentCompat {
        @Override
        public void onCreatePreferences(Bundle savedInstanceState, String rootKey) {
            addPreferencesFromResource(R.xml.settings_prefs);

            final SwitchPreferenceCompat switchPreferenceCompat = (SwitchPreferenceCompat) getPreferenceManager().findPreference("rememberME");
            switchPreferenceCompat.setSummaryProvider(new Preference.SummaryProvider() {
                @Override
                public CharSequence provideSummary(Preference preference) {
                    if (switchPreferenceCompat.isChecked()) {
                        return "Active";
                    }
                    return "Inactive";


                }
            });
    }}

//.xml file
<PreferenceScreen
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    app:key="test">
    <PreferenceCategory android:title="Σύνδεση">
    <SwitchPreferenceCompat
        app:key="rememberME"
        android:defaultValue="false"
        app:title="Παραμείνετε Συνδεδεμένος" />
    </PreferenceCategory>
</PreferenceScreen>