BikefriendPreferenceActivity.java

package com.lemoulinstudio.bikefriend.preference;

import android.content.SharedPreferences;
import android.os.Bundle;
import android.preference.EditTextPreference;
import android.preference.ListPreference;
import android.preference.Preference;
import android.preference.PreferenceActivity;
import android.preference.PreferenceGroup;

import com.lemoulinstudio.bikefriend.R;


public class BikefriendPreferenceActivity extends PreferenceActivity
        implements SharedPreferences.OnSharedPreferenceChangeListener {

    public static String PREFERENCES_NAME = BikefriendPreferences.class.getSimpleName();

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        // Set which preferences to use.
        getPreferenceManager().setSharedPreferencesName(PREFERENCES_NAME);

        // Opening the layout
        addPreferencesFromResource(R.xml.preferences);

        // Init the summary of items recursively.
        initSummary(getPreferenceScreen());
    }

    @Override
    protected void onResume() {
        super.onResume();
        getPreferenceScreen().getSharedPreferences().registerOnSharedPreferenceChangeListener(this);
    }

    @Override
    protected void onPause() {
        super.onPause();
        getPreferenceScreen().getSharedPreferences().unregisterOnSharedPreferenceChangeListener(this);
    }

    @Override
    public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {
        initSummary(findPreference(key));
    }

    private void initSummary(Preference preference) {
        if (preference instanceof PreferenceGroup) {
            PreferenceGroup group = (PreferenceGroup) preference;
            for (int i = 0; i < group.getPreferenceCount(); i++) {
                initSummary(group.getPreference(i));
            }
        }
        else {
            if (preference instanceof EditTextPreference) {
                EditTextPreference editTextPreference = (EditTextPreference) preference;
                preference.setSummary(editTextPreference.getText());
            }
            else if (preference instanceof ListPreference) {
                ListPreference listPreference = (ListPreference) preference;
                preference.setSummary(listPreference.getEntry());
            }
        }
    }
}