BasePreferenceFragment.java

package de.lukasniemeier.mensa.ui.preference;

import android.preference.CheckBoxPreference;
import android.preference.ListPreference;
import android.preference.Preference;
import android.preference.PreferenceFragment;
import android.preference.PreferenceManager;

/**
 * Created on 18.09.13.
 */
public class BasePreferenceFragment extends PreferenceFragment {

    protected static final Preference.OnPreferenceChangeListener sBindPreferenceSummaryToValueListener = new Preference.OnPreferenceChangeListener() {
        @Override
        public boolean onPreferenceChange(Preference preference, Object value) {
            String stringValue = value.toString();

            if (preference instanceof ListPreference) {
                ListPreference listPreference = (ListPreference) preference;
                int index = listPreference.findIndexOfValue(stringValue);
                preference.setSummary(
                        index >= 0
                                ? listPreference.getEntries()[index]
                                : null);

            } else {
                preference.setSummary(stringValue);
            }
            return true;
        }
    };

    protected static void bindPreferenceSummaryToValue(Preference preference) {
        preference.setOnPreferenceChangeListener(sBindPreferenceSummaryToValueListener);

        sBindPreferenceSummaryToValueListener.onPreferenceChange(preference,
                PreferenceManager
                        .getDefaultSharedPreferences(preference.getContext())
                        .getString(preference.getKey(), ""));
    }

    protected static void bindPreferenceToCheckbox(CheckBoxPreference checkboxPreference, final Preference target) {
        target.setEnabled(checkboxPreference.isChecked());
        checkboxPreference.setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener() {
            @Override
            public boolean onPreferenceChange(Preference preference, Object value) {
                target.setEnabled((Boolean) value);
                return true;
            }
        });
    }
}