Android Open Source - nsa-away Preferences Activity

From Project

Back to project page nsa-away.
License

The source code is released under:
GNU General Public License
If you think the Android project nsa-away listed in this page is inappropriate, such as containing malicious code/tools or violating the copyright, please email info at java2s dot com, thanks.
Java Source Code

/*
 * Copyright (C) 2008 ZXing authors/*from w  w  w .j a v a 2s.co m*/
 * Copyright 2011 Robert Theis
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.sector67.nsaaway.ocr.complex;

import org.sector67.nsaaway.R;

import android.content.SharedPreferences;
import android.content.SharedPreferences.OnSharedPreferenceChangeListener;
import android.os.Bundle;
import android.preference.EditTextPreference;
import android.preference.ListPreference;
import android.preference.PreferenceActivity;
import android.preference.PreferenceManager;
import org.sector67.nsaaway.ocr.complex.language.LanguageCodeHelper;


/**
 * Class to handle preferences that are saved across sessions of the app. Shows
 * a hierarchy of preferences to the user, organized into sections. These
 * preferences are displayed in the options menu that is shown when the user
 * presses the MENU button.
 * 
 * The code for this class was adapted from the ZXing project: http://code.google.com/p/zxing
 */
public class PreferencesActivity extends PreferenceActivity implements
  OnSharedPreferenceChangeListener {
  
  // Preference keys not carried over from ZXing project
  public static final String KEY_SOURCE_LANGUAGE_PREFERENCE = "sourceLanguageCodeOcrPref";
  public static final String KEY_CONTINUOUS_PREVIEW = "preference_capture_continuous";
  public static final String KEY_PAGE_SEGMENTATION_MODE = "preference_page_segmentation_mode";
  public static final String KEY_OCR_ENGINE_MODE = "preference_ocr_engine_mode";
  public static final String KEY_CHARACTER_BLACKLIST = "preference_character_blacklist";
  public static final String KEY_CHARACTER_WHITELIST = "preference_character_whitelist";
  public static final String KEY_TOGGLE_LIGHT = "preference_toggle_light";
  
  // Preference keys carried over from ZXing project
  public static final String KEY_AUTO_FOCUS = "preferences_auto_focus";
  public static final String KEY_DISABLE_CONTINUOUS_FOCUS = "preferences_disable_continuous_focus";
  public static final String KEY_HELP_VERSION_SHOWN = "preferences_help_version_shown";
  public static final String KEY_NOT_OUR_RESULTS_SHOWN = "preferences_not_our_results_shown";
  public static final String KEY_REVERSE_IMAGE = "preferences_reverse_image";
  public static final String KEY_PLAY_BEEP = "preferences_play_beep";
  public static final String KEY_VIBRATE = "preferences_vibrate";
  
  private ListPreference listPreferenceSourceLanguage;
  private ListPreference listPreferenceOcrEngineMode;
  private EditTextPreference editTextPreferenceCharacterBlacklist;
  private EditTextPreference editTextPreferenceCharacterWhitelist;
  private ListPreference listPreferencePageSegmentationMode;
  
  private static SharedPreferences sharedPreferences;
  
  /**
   * Set the default preference values.
   * 
   * @param Bundle
   *            savedInstanceState the current Activity's state, as passed by
   *            Android
   */
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    addPreferencesFromResource(R.xml.preferences);
    
    sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);
    
    listPreferenceSourceLanguage = (ListPreference) getPreferenceScreen().findPreference(KEY_SOURCE_LANGUAGE_PREFERENCE);
    listPreferenceOcrEngineMode = (ListPreference) getPreferenceScreen().findPreference(KEY_OCR_ENGINE_MODE);
    editTextPreferenceCharacterBlacklist = (EditTextPreference) getPreferenceScreen().findPreference(KEY_CHARACTER_BLACKLIST);
    editTextPreferenceCharacterWhitelist = (EditTextPreference) getPreferenceScreen().findPreference(KEY_CHARACTER_WHITELIST);
    listPreferencePageSegmentationMode = (ListPreference) getPreferenceScreen().findPreference(KEY_PAGE_SEGMENTATION_MODE);

    
  }
  
  /**
   * Interface definition for a callback to be invoked when a shared
   * preference is changed. Sets summary text for the app's preferences. Summary text values show the
   * current settings for the values.
   * 
   * @param sharedPreferences
   *            the Android.content.SharedPreferences that received the change
   * @param key
   *            the key of the preference that was changed, added, or removed
   */
  @Override
  public void onSharedPreferenceChanged(SharedPreferences sharedPreferences,
      String key) {    
    // Update preference summary values to show current preferences
    if(key.equals(KEY_SOURCE_LANGUAGE_PREFERENCE)) {
      
      // Set the summary text for the source language name
      listPreferenceSourceLanguage.setSummary(LanguageCodeHelper.getOcrLanguageName(getBaseContext(), sharedPreferences.getString(key, CaptureActivity.DEFAULT_SOURCE_LANGUAGE_CODE)));
      
      // Retrieve the character blacklist/whitelist for the new language
      String blacklist = OcrCharacterHelper.getBlacklist(sharedPreferences, listPreferenceSourceLanguage.getValue());
      String whitelist = OcrCharacterHelper.getWhitelist(sharedPreferences, listPreferenceSourceLanguage.getValue());
      
      // Save the character blacklist/whitelist to preferences
      sharedPreferences.edit().putString(KEY_CHARACTER_BLACKLIST, blacklist).commit();
      sharedPreferences.edit().putString(KEY_CHARACTER_WHITELIST, whitelist).commit();
      
      // Set the blacklist/whitelist summary text
      editTextPreferenceCharacterBlacklist.setSummary(blacklist);
      editTextPreferenceCharacterWhitelist.setSummary(whitelist);

    } else if (key.equals(KEY_PAGE_SEGMENTATION_MODE)) {
      listPreferencePageSegmentationMode.setSummary(sharedPreferences.getString(key, CaptureActivity.DEFAULT_PAGE_SEGMENTATION_MODE));
    } else if (key.equals(KEY_OCR_ENGINE_MODE)) {
      listPreferenceOcrEngineMode.setSummary(sharedPreferences.getString(key, CaptureActivity.DEFAULT_OCR_ENGINE_MODE));
    } else if (key.equals(KEY_CHARACTER_BLACKLIST)) {  
      
      // Save a separate, language-specific character blacklist for this language
      OcrCharacterHelper.setBlacklist(sharedPreferences, 
          listPreferenceSourceLanguage.getValue(), 
          sharedPreferences.getString(key, OcrCharacterHelper.getDefaultBlacklist(listPreferenceSourceLanguage.getValue())));
      
      // Set the summary text
      editTextPreferenceCharacterBlacklist.setSummary(sharedPreferences.getString(key, OcrCharacterHelper.getDefaultBlacklist(listPreferenceSourceLanguage.getValue())));
      
    } else if (key.equals(KEY_CHARACTER_WHITELIST)) {
      
      // Save a separate, language-specific character blacklist for this language
      OcrCharacterHelper.setWhitelist(sharedPreferences, 
          listPreferenceSourceLanguage.getValue(), 
          sharedPreferences.getString(key, OcrCharacterHelper.getDefaultWhitelist(listPreferenceSourceLanguage.getValue())));
      
      // Set the summary text
      editTextPreferenceCharacterWhitelist.setSummary(sharedPreferences.getString(key, OcrCharacterHelper.getDefaultWhitelist(listPreferenceSourceLanguage.getValue())));
      
    }

    
  }

  
  /**
   * Sets up initial preference summary text
   * values and registers the OnSharedPreferenceChangeListener.
   */
  @Override
  protected void onResume() {
    super.onResume();
    // Set up the initial summary values
    listPreferenceSourceLanguage.setSummary(LanguageCodeHelper.getOcrLanguageName(getBaseContext(), sharedPreferences.getString(KEY_SOURCE_LANGUAGE_PREFERENCE, CaptureActivity.DEFAULT_SOURCE_LANGUAGE_CODE)));
    listPreferencePageSegmentationMode.setSummary(sharedPreferences.getString(KEY_PAGE_SEGMENTATION_MODE, CaptureActivity.DEFAULT_PAGE_SEGMENTATION_MODE));
    listPreferenceOcrEngineMode.setSummary(sharedPreferences.getString(KEY_OCR_ENGINE_MODE, CaptureActivity.DEFAULT_OCR_ENGINE_MODE));
    editTextPreferenceCharacterBlacklist.setSummary(sharedPreferences.getString(KEY_CHARACTER_BLACKLIST, OcrCharacterHelper.getDefaultBlacklist(listPreferenceSourceLanguage.getValue())));
    editTextPreferenceCharacterWhitelist.setSummary(sharedPreferences.getString(KEY_CHARACTER_WHITELIST, OcrCharacterHelper.getDefaultWhitelist(listPreferenceSourceLanguage.getValue())));
    
    // Set up a listener whenever a key changes
    getPreferenceScreen().getSharedPreferences().registerOnSharedPreferenceChangeListener(this);
  }

  /**
   * Called when Activity is about to lose focus. Unregisters the
   * OnSharedPreferenceChangeListener.
   */
  @Override
  protected void onPause() {
    super.onPause();
    getPreferenceScreen().getSharedPreferences().unregisterOnSharedPreferenceChangeListener(this);
  }
}
Java Source Code List
