Moved preference strings from strings.xml to their own category file

app/src/main/java/com/philliphsu/clock2/settings/SettingsActivity.java

@@ -9,18 +9,6 @@ import com.philliphsu.clock2.R;
  * Created by Phillip Hsu on 6/6/2016.
  */
 public class SettingsActivity extends BaseActivity {
-    /*
-     * TODO: Define these keys as string resources instead and then delete these.
-     * TODO: Move the existing string resources for the preferences below from strings.xml to prefs.xml
-     */
-    // World Clock preference keys
-    public static final String KEY_PREF_SHOW_TIME_OFFSETS_FROM = "pref_show_time_offsets_from";
-    // Alarms preference keys
-    public static final String KEY_PREF_TIME_PICKER_STYLE = "pref_time_picker_style";
-    public static final String KEY_PREF_SNOOZE_DURATION = "pref_snooze_duration";
-    public static final String KEY_PREF_FIRST_DAY_OF_WEEK = "pref_first_day_of_week";
-    // Timers preference keys
-    public static final String KEY_PREF_TIMER_RINGTONE = "pref_timer_ringtone";
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {

app/src/main/java/com/philliphsu/clock2/settings/SettingsFragment.java

@@ -23,8 +23,7 @@ public class SettingsFragment extends PreferenceFragment implements SharedPrefer
         super.onCreate(savedInstanceState);
         addPreferencesFromResource(R.xml.preferences);
         // Set ringtone summary
-        setSummary(getPreferenceScreen().getSharedPreferences(),
-                SettingsActivity.KEY_PREF_TIMER_RINGTONE);
+        setSummary(getPreferenceScreen().getSharedPreferences(), getString(R.string.key_timer_ringtone));
         findPreference(getString(R.string.key_alarm_volume))
                 .setOnPreferenceClickListener(new Preference.OnPreferenceClickListener() {
             @Override