Android Open Source - robattery Settings

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License

The source code is released under:

GNU General Public License

Java Source Code

/*
 *  Copyright (C) 2009-2010    John Reese, LeetCode.net
 *//from w ww . j  a  va2 s.  c  o  m
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

package net.leetcode.robattery;

import android.content.SharedPreferences;
import android.media.Ringtone;
import android.media.RingtoneManager;
import android.net.Uri;
import android.os.Bundle;
import android.preference.PreferenceActivity;
import android.preference.PreferenceManager;
import android.util.Log;

/**
 * Activity screen for setting Robattery preferences
 * @author jreese
 */
public class Settings extends PreferenceActivity {
  public static final String LOGCAT = "RobatterySettings";

  /**
   * Listener class for passing preference updates to the settings activity.
   * in order to update list item summaries.
   */
  private class RobatterySettingsUpdateListener implements SharedPreferences.OnSharedPreferenceChangeListener {
    public void onSharedPreferenceChanged(SharedPreferences prefs, String key) {
      Log.d(LOGCAT, "onSharedPreferencesChanged: " + key);
      
      updateSummaries(prefs);
    }
  }
  
  /**
   * Update list preference summaries to match new pref values.
   * @param prefs SharedPreferences instance to use for value lookups
   */
  public void updateSummaries(SharedPreferences prefs) {
    // Battery level pref summary
    updateSummary(prefs, "notification_level", R.array.notification_levels, R.array.notification_level_values);
    
    // Notification interval pref summary
    updateSummary(prefs, "notification_interval", R.array.notification_intervals, R.array.notification_interval_values);
    
    // Ringtone pref summary
    String path = prefs.getString("notification_ringtone", "");
    Uri uri = Uri.parse(path);
    Log.d(LOGCAT, "Uri: " + uri.toString());
    if (path.equals("")) {
      findPreference("notification_ringtone").setSummary(R.string.silent);
    } else if (RingtoneManager.isDefault(uri)) {
      findPreference("notification_ringtone").setSummary(R.string.default_ringtone);
    } else {
      Ringtone tone = RingtoneManager.getRingtone(getBaseContext(), uri);
      findPreference("notification_ringtone").setSummary(tone.getTitle(getBaseContext()));
    }
  }
  
  /**
   * Given a preference name and R.array ids, set the preference summary based
   * on the user's selected value.
   * @param prefs
   * @param pref
   * @param rlabels
   * @param rvalues
   */
  private void updateSummary(SharedPreferences prefs, String pref, int rlabels, int rvalues) {
    String[] labels = getResources().getStringArray(rlabels);
    String[] values = getResources().getStringArray(rvalues);
    int index = findIndex(labels, values, prefs.getString(pref, ""));
    if (index >= 0) {
      findPreference(pref).setSummary(labels[index]);
    }
  }
  
  /**
   * Given string arrays, return the index representing the given value.
   * @param labels
   * @param values
   * @param value
   * @return index
   */
  private int findIndex(String[] labels, String[] values, String value) {
    for (int i = 0; i < labels.length && i < values.length; i++) {
      if (values[i].equals(value)) {
        return i;
      }
    }
    return -1;
  }
  
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    addPreferencesFromResource(R.xml.settings);
    
    // start the update listener and initialize summaries
    SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(getBaseContext());
    prefs.registerOnSharedPreferenceChangeListener(new RobatterySettingsUpdateListener());
    updateSummaries(prefs);
  }

  @Override
  public void onResume() {
    super.onResume();
    
    // kick the update listener and refresh summaries
    SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(getBaseContext());
    prefs.registerOnSharedPreferenceChangeListener(new RobatterySettingsUpdateListener());
    updateSummaries(prefs);
  }
}

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