How to use DatePickerDialog as a Preference

Question

I have preferences working and I am using a combination of CheckBoxPreference and EditTextPreference. I would like to replace one of them with a DatePickerDialog.

When m

Answer 1

Just a simple way to use TimePickerFragment in the settings, it doesn't really answer your question, but it can help some guys.
Please read this before: https://developer.android.com/guide/topics/ui/settings
From "Overview" to "Preference... attributes" of course... Oo

controller.fragments

public class TimePickerFragment extends DialogFragment {

    private TimePickerDialog.OnTimeSetListener onTimeSetListener;
    private int hours;
    private int minutes;

    TimePickerFragment(TimePickerDialog.OnTimeSetListener onTimeSetListener, int hours, int minutes) {
        this.onTimeSetListener = onTimeSetListener;
        this.hours = hours;
        this.minutes = minutes;
    }

    @NonNull
    @Override
    public Dialog onCreateDialog(@Nullable Bundle savedInstanceState) {
        return new TimePickerDialog(getActivity(), R.style.dateTimePicker,
                onTimeSetListener, hours, minutes, DateFormat.is24HourFormat(getActivity()));
    }
}

res.values.style

res.xml.root_preferences.xml create the xml folder in res & the file root_preferences of course Oo

controller.activities.SettingsActivity

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.settings_activity);
    getSupportFragmentManager()
            .beginTransaction()
            .add(R.id.settings, new SettingsFragment())
            .commit();
}

controller.fragments.SettingsFragment

public class SettingsFragment extends PreferenceFragmentCompat implements TimePickerDialog.OnTimeSetListener {


         private Preference setTime;

         public void onCreatePreferences(Bundle savedInstanceState, String rootKey) {
            setPreferencesFromResource(R.xml.root_preferences, rootKey);
            getPreference();
            configListener();
        }

        private void getPreference() {
            setTime = findPreference("set_time");
        }

        private void configListener() {
            if (setTime != null){
                setTime.setOnPreferenceClickListener(preference -> {
                    showTimeDialog(preference);
                    return true;
                });
            }
        }

        private void showTimeDialog(Preference preference) {
            String value = preference.getSharedPreferences().getString("set_time", "12:00");
            String[] time = value.split(":");
            int hours = Integer.parseInt(time[0]);
            int minutes = Integer.parseInt(time[1]);
            if (getFragmentManager() != null) {
            new TimePickerFragment(this, hours, minutes)
                .show(getFragmentManager(), getString(R.string.tag_time_picker));
            }
        }

        @Override
        public void onTimeSet(TimePicker timePicker, int h, int m) {
            String time = format(Locale.getDefault(),"%02d", h) + ":" + format(Locale.getDefault(), "%02d", m);
            SharedPreferences sharedPreferences =
                    PreferenceManager.getDefaultSharedPreferences(context);
            sharedPreferences.edit().putString("set_time", time).apply();
            // if you use setOnPreferenceChangeListener on it, use setTime.callChangeListener(time);
        }
}

I didn't document anything because after reading the guide, you should all understand ^^