app/src/main/java/uk/me/njae/sunshine/SettingsActivity.java

   1 package uk.me.njae.sunshine;
   2
   3 import android.os.Bundle;
   4 import android.preference.ListPreference;
   5 import android.preference.Preference;
   6 import android.preference.PreferenceActivity;
   7 import android.preference.PreferenceManager;
   8
   9 /**
  10  * A {@link PreferenceActivity} that presents a set of application settings.
  11  * <p>
  12  * See <a href="http://developer.android.com/design/patterns/settings.html">
  13  * Android Design: Settings</a> for design guidelines and the <a
  14  * href="http://developer.android.com/guide/topics/ui/settings.html">Settings
  15  * API Guide</a> for more information on developing a Settings UI.
  16  */
  17 public class SettingsActivity extends PreferenceActivity
  18         implements Preference.OnPreferenceChangeListener {
  19
  20     @Override
  21     public void onCreate(Bundle savedInstanceState) {
  22         super.onCreate(savedInstanceState);
  23         // Add 'general' preferences, defined in the XML file
  24         addPreferencesFromResource(R.xml.pref_general);
  25
  26         // For all preferences, attach an OnPreferenceChangeListener so the UI summary can be
  27         // updated when the preference changes.
  28         bindPreferenceSummaryToValue(findPreference(getString(R.string.pref_location_key)));
  29     }
  30
  31     /**
  32      * Attaches a listener so the summary is always updated with the preference value.
  33      * Also fires the listener once, to initialize the summary (so it shows up before the value
  34      * is changed.)
  35      */
  36     private void bindPreferenceSummaryToValue(Preference preference) {
  37         // Set the listener to watch for value changes.
  38         preference.setOnPreferenceChangeListener(this);
  39
  40         // Trigger the listener immediately with the preference's
  41         // current value.
  42         onPreferenceChange(preference,
  43                 PreferenceManager
  44                         .getDefaultSharedPreferences(preference.getContext())
  45                         .getString(preference.getKey(), ""));
  46     }
  47
  48     @Override
  49     public boolean onPreferenceChange(Preference preference, Object value) {
  50         String stringValue = value.toString();
  51
  52         if (preference instanceof ListPreference) {
  53             // For list preferences, look up the correct display value in
  54             // the preference's 'entries' list (since they have separate labels/values).
  55             ListPreference listPreference = (ListPreference) preference;
  56             int prefIndex = listPreference.findIndexOfValue(stringValue);
  57             if (prefIndex >= 0) {
  58                 preference.setSummary(listPreference.getEntries()[prefIndex]);
  59             }
  60         } else {
  61             // For other preferences, set the summary to the value's simple string representation.
  62             preference.setSummary(stringValue);
  63         }
  64         return true;
  65     }
  66
  67 }