Android Open Source - filemanager App Preferences

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License

The source code is released under:

MIT License

Java Source Code

/*******************************************************************************
 * Copyright (c) 2014 Michal Dabski//w  w  w. j  a  v a2  s . c o m
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy of
 * this software and associated documentation files (the "Software"), to deal in
 * the Software without restriction, including without limitation the rights to
 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
 * the Software, and to permit persons to whom the Software is furnished to do so,
 * subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
 * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
 * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 ******************************************************************************/
package com.michaldabski.filemanager;

import android.content.Context;
import android.content.SharedPreferences;
import android.os.Environment;

import com.michaldabski.utils.FileUtils;

import java.io.File;
import java.security.InvalidParameterException;
import java.util.Comparator;

public class AppPreferences
{
  private static final String 
    NAME = "FileExplorerPreferences",
    
    PREF_START_FOLDER = "start_folder",
    PREF_CARD_LAYOUT = "card_layout",
    PREF_SORT_BY = "sort_by";
  
  public static final int
    SORT_BY_NAME = 0,
    SORT_BY_TYPE = 1,
    SORT_BY_SIZE = 2;
  
  public static final int
    CARD_LAYOUT_MEDIA = 0,
    CARD_LAYOUT_ALWAYS = 1,
    CARD_LAYOUT_NEVER = 2;
  
  private final static int DEFAULT_SORT_BY = SORT_BY_NAME;
  
  File startFolder;
  int sortBy;
  int cardLayout;
  
  private AppPreferences() {    
  }
  
  private void loadFromSharedPreferences(SharedPreferences sharedPreferences)
  {
    String startPath = sharedPreferences.getString(PREF_START_FOLDER, null);
    if (startPath == null)
    {
      if (Environment.getExternalStorageDirectory().list() != null)
        startFolder = Environment.getExternalStorageDirectory();
      else 
        startFolder = new File("/");
    }
    else this.startFolder = new File(startPath);
    this.sortBy = sharedPreferences.getInt(PREF_SORT_BY, DEFAULT_SORT_BY);
    this.cardLayout = sharedPreferences.getInt(PREF_CARD_LAYOUT, CARD_LAYOUT_MEDIA);
  }
  
  private void saveToSharedPreferences(SharedPreferences sharedPreferences)
  {
    sharedPreferences.edit()
      .putString(PREF_START_FOLDER, startFolder.getAbsolutePath())
      .putInt(PREF_SORT_BY, sortBy)
      .putInt(PREF_CARD_LAYOUT, cardLayout)
      .apply();
  }
  
  public void saveChangesAsync(final Context context)
  {
    new Thread(new Runnable()
    {
      
      @Override
      public void run()
      {
        saveChanges(context);
        
      }
    }).run();
  }
  
  public void saveChanges(Context context)
  {
    saveToSharedPreferences(context.getSharedPreferences(NAME, Context.MODE_PRIVATE));
  }

  public AppPreferences setStartFolder(File startFolder)
  {
    this.startFolder = startFolder;
    return this;
  }
  
  public void setCardLayout(int cardLayout)
  {
    this.cardLayout = cardLayout;
  }
  
  public int getCardLayout()
  {
    return cardLayout;
  }
  
  public AppPreferences setSortBy(int sortBy)
  {
    if (sortBy < 0 || sortBy > 2)
      throw new InvalidParameterException(String.valueOf(sortBy)+" is not a valid id of sorting order");
    
    this.sortBy = sortBy;
    return this;
  }
  
  public int getSortBy()
  {
    return sortBy;
  }
  
  public File getStartFolder()
  {
        if (startFolder.exists() == false)
            startFolder = new File("/");
    return startFolder;
  }
  
  public Comparator<File> getFileSortingComparator()
  {
    switch (sortBy)
    {
      case SORT_BY_SIZE:
        return new FileUtils.FileSizeComparator();
        
      case SORT_BY_TYPE:
        return new FileUtils.FileExtensionComparator();
        
      default:
        return new FileUtils.FileNameComparator();
    }
  }
  
  public static AppPreferences loadPreferences(Context context)
  {
    AppPreferences instance = new AppPreferences();
    instance.loadFromSharedPreferences(context.getSharedPreferences(NAME, Context.MODE_PRIVATE));
    return instance;
  }
}

Java Source Code List

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