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         bindPreferenceSummaryToValue(findPreference(getString(R.string.pref_units_key)));
  30
  31     }
  32
  33     /**
  34      * Attaches a listener so the summary is always updated with the preference value.
  35      * Also fires the listener once, to initialize the summary (so it shows up before the value
  36      * is changed.)
  37      */
  38     private void bindPreferenceSummaryToValue(Preference preference) {
  39         // Set the listener to watch for value changes.
  40         preference.setOnPreferenceChangeListener(this);
  41
  42         // Trigger the listener immediately with the preference's
  43         // current value.
  44         onPreferenceChange(preference,
  45                 PreferenceManager
  46                         .getDefaultSharedPreferences(preference.getContext())
  47                         .getString(preference.getKey(), ""));
  48     }
  49
  50     @Override
  51     public boolean onPreferenceChange(Preference preference, Object value) {
  52         String stringValue = value.toString().trim();
  53
  54         if (preference instanceof ListPreference) {
  55             // For list preferences, look up the correct display value in
  56             // the preference's 'entries' list (since they have separate labels/values).
  57             ListPreference listPreference = (ListPreference) preference;
  58             int prefIndex = listPreference.findIndexOfValue(stringValue);
  59             if (prefIndex >= 0) {
  60                 preference.setSummary(listPreference.getEntries()[prefIndex]);
  61             }
  62         } else {
  63             // For other preferences, set the summary to the value's simple string representation.
  64             preference.setSummary(stringValue);
  65         }
  66         return true;
  67     }
  68
  69 }