SettingsActivity.java

package com.basic.mileagecalculatorwithsettings;

import android.annotation.TargetApi;
import android.content.Context;
import android.content.SharedPreferences.Editor;
import android.content.res.Configuration;
import android.media.Ringtone;
import android.media.RingtoneManager;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.preference.ListPreference;
import android.preference.Preference;
import android.preference.PreferenceActivity;
import android.preference.PreferenceCategory;
import android.preference.PreferenceFragment;
import android.preference.PreferenceManager;
import android.preference.RingtonePreference;
import android.text.TextUtils;
import android.view.MenuItem;
import android.support.v4.app.NavUtils;
import java.util.List;

public class SettingsActivity extends PreferenceActivity
{
    private static final boolean ALWAYS_SIMPLE_PREFS = false;
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setupActionBar();
    }
    @TargetApi(Build.VERSION_CODES.HONEYCOMB)
    private void setupActionBar()
    {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB)
        {
            getActionBar().setDisplayHomeAsUpEnabled(true);
            }
    }
        @Override
        public boolean onOptionsItemSelected(MenuItem item)
        {
            switch (item.getItemId())
            {
            case android.R.id.home:
                NavUtils.navigateUpFromSameTask(this);
                return true;
            }
            return super.onOptionsItemSelected(item);
        }
        @Override
        protected void onPostCreate(Bundle savedInstanceState)
        {
            super.onPostCreate(savedInstanceState);

            setupSimplePreferencesScreen();
        }
        private void setupSimplePreferencesScreen() {
            if (!isSimplePreferences(this)) {
                return;
            }
            addPreferencesFromResource(R.xml.pref_general);}
        @Override
        public boolean onIsMultiPane()
        {
            return isXLargeTablet(this) && !isSimplePreferences(this);
        }
        private static boolean isXLargeTablet(Context context)
        {
            return (context.getResources().getConfiguration().screenLayout & Configuration.SCREENLAYOUT_SIZE_MASK) >= Configuration.SCREENLAYOUT_SIZE_XLARGE;
        }
        private static boolean isSimplePreferences(Context context)
        {
            return ALWAYS_SIMPLE_PREFS
                    || Build.VERSION.SDK_INT < Build.VERSION_CODES.HONEYCOMB
                    || !isXLargeTablet(context);
        }
        @Override
        @TargetApi(Build.VERSION_CODES.HONEYCOMB)
        public void onBuildHeaders(List<Header> target)
        {
            if (!isSimplePreferences(this))
            {
                //loadHeadersFromResource(R.xml.pref_headers, target);
            }
        }
        private static 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 if (preference instanceof RingtonePreference)
                {
                    if (TextUtils.isEmpty(stringValue))
                    {
                        //preference.setSummary(R.string.pref_ringtone_silent);
                    }
                    else
                    {
                        Ringtone ringtone = RingtoneManager.getRingtone(
                                preference.getContext(), Uri.parse(stringValue));
                        if (ringtone == null)
                        {preference.setSummary(null);}
                        else
                        {
                            String name = ringtone.getTitle(preference.getContext());
                            preference.setSummary(name);
                        }
                    }
                }
                else
                {
                    preference.setSummary(stringValue);
                }
                return true;
            }
    };
    private static void bindPreferenceSummaryToValue(Preference preference)
    {
        preference.setOnPreferenceChangeListener(sBindPreferenceSummaryToValueListener);
        sBindPreferenceSummaryToValueListener.onPreferenceChange(preference,PreferenceManager.getDefaultSharedPreferences(preference.getContext()).getString(preference.getKey(),""));
    }
    @TargetApi(Build.VERSION_CODES.HONEYCOMB)
    public static class GeneralPreferenceFragment extends PreferenceFragment
    {
        @Override
        public void onCreate(Bundle savedInstanceState)
        {
            super.onCreate(savedInstanceState);
            addPreferencesFromResource(R.xml.pref_general);
            bindPreferenceSummaryToValue(findPreference("example_list"));
            bindPreferenceSummaryToValue(findPreference("fuel_type"));
            bindPreferenceSummaryToValue(findPreference("unit_type"));
        }
        public void onPause()
        {
          super.onPause();
          addPreferencesFromResource(R.xml.pref_general);
          bindPreferenceSummaryToValue(findPreference("unit_type"));
         }
    }
}