package com.example.android.sunshine.app;

import android.os.Bundle;
import android.preference.ListPreference;
import android.preference.Preference;
import android.preference.PreferenceActivity;
import android.preference.PreferenceManager;

/**
 * A {@link PreferenceActivity} that presents a set of application settings.
 *
 * See Android Design: Settings
 *
 * @link http://developer.android.com/design/patterns/settings.html
 *
 * `Settings API Guide` for more information on developing a Settings UI.
 * @link http://developer.android.com/guide/topics/ui/settings.html
 *
 * Created by Francis Rodrigues on 1/19/17.
 */

public class SettingsActivity extends PreferenceActivity
        implements Preference.OnPreferenceChangeListener {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        // Add 'general' preferences, defined in the XML file
        // TODO: Add preferences from XML

        // For all preferences, attach an OnPreferenceChangeListener so the UI summary can be
        // updated when the preference changes
        // TODO: Add preference
    }

    /**
     * Attaches a listener so the summary is always updated with the preference value.
     * Also fires the listener once, to initialize the summary (so it shows up before the value
     * is changed.)
     */
    private void bindPreferenceSymmaryToValue(Preference preference) {
        // Set the listener to watch for value changes.
        preference.setOnPreferenceChangeListener(this);

        // Trigger the listener immediately with the preference's current value.
        onPreferenceChange(preference, PreferenceManager
                .getDefaultSharedPreferences(preference.getContext())
                .getString(preference.getKey(), "")
        );
    }

    @Override
    public boolean onPreferenceChange(Preference preference, Object newValue) {
        String stringValue = String.valueOf(newValue);

        if (preference instanceof ListPreference) {
            // For list preferences, look up the correct display value in
            // the preference's 'entries' list (since they have separate labels/values)
            ListPreference listPreference = (ListPreference) preference;
            int prefIndex = listPreference.findIndexOfValue(stringValue);
            if (prefIndex >= 0) {
                preference.setSummary(listPreference.getEntries()[prefIndex]);
            }
        } else {
            // For other preferences, set the summary to the value's simple string representation.
            preference.setSummary(stringValue);
        }

        return true;
    }
}

package com.example.android.sunshine.app;

import android.os.Bundle;
import android.preference.ListPreference;
import android.preference.Preference;
import android.preference.PreferenceActivity;
import android.preference.PreferenceManager;

/**
 * A {@link PreferenceActivity} that presents a set of application settings.
 *
 * See Android Design: Settings
 *
 * @link http://developer.android.com/design/patterns/settings.html
 *
 * `Settings API Guide` for more information on developing a Settings UI.
 * @link http://developer.android.com/guide/topics/ui/settings.html
 *
 * Created by Francis Rodrigues on 1/19/17.
 */

public class SettingsActivity extends PreferenceActivity
        implements Preference.OnPreferenceChangeListener {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        // Add 'general' preferences, defined in the XML file
        addPreferencesFromResource(R.xml.pref_general);

        // For all preferences, attach an OnPreferenceChangeListener so the UI summary can be
        // updated when the preference changes
        bindPreferenceSymmaryToValue(findPreference(getString(R.string.pref_location_key)));
    }

    /**
     * Attaches a listener so the summary is always updated with the preference value.
     * Also fires the listener once, to initialize the summary (so it shows up before the value
     * is changed.)
     */
    private void bindPreferenceSymmaryToValue(Preference preference) {
        // Set the listener to watch for value changes.
        preference.setOnPreferenceChangeListener(this);

        // Trigger the listener immediately with the preference's current value.
        onPreferenceChange(preference, PreferenceManager
                .getDefaultSharedPreferences(preference.getContext())
                .getString(preference.getKey(), "")
        );
    }

    @Override
    public boolean onPreferenceChange(Preference preference, Object newValue) {
        String stringValue = String.valueOf(newValue);

        if (preference instanceof ListPreference) {
            // For list preferences, look up the correct display value in
            // the preference's 'entries' list (since they have separate labels/values)
            ListPreference listPreference = (ListPreference) preference;
            int prefIndex = listPreference.findIndexOfValue(stringValue);
            if (prefIndex >= 0) {
                preference.setSummary(listPreference.getEntries()[prefIndex]);
            }
        } else {
            // For other preferences, set the summary to the value's simple string representation.
            preference.setSummary(stringValue);
        }

        return true;
    }
}

Inflate view in SettingsActivity