Android Open Source - android_rss_reader Feed Helper

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License

The source code is released under:

Apache License

Java Source Code

/***********************************************************************************************************************
 * ==========================================
 */*from   w  ww  .  j a  v  a  2 s  .co  m*/
 * Copyright (C) 2013 by Paul Oremland
 * http://www.linkedin.com/in/pauloremland
 * https://github.com/poremland
 *
 ***********************************************************************************************************************
 *
 * 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 net.oremland.rss.reader.helpers;

import android.content.Context;
import android.content.SharedPreferences;

import com.google.gson.Gson;
import com.google.gson.reflect.TypeToken;

import java.lang.reflect.*;
import java.util.*;

import net.oremland.rss.reader.MainApplication;
import net.oremland.rss.reader.models.*;

public class FeedHelper
{
  private final static String PREFERENCE = "net.oremland.rss.reader.FEED_PREFERENCE";
  public final static String FEED_LIST = "FEED_LIST";

  public void addFeed(Feed feed)
  {
    if(feed != null)
    {
      SharedPreferences prefs = this.getSharedPreferences();
      ArrayList<Feed> feeds = this.getSavedList(prefs);
      if(!feeds.contains(feed))
      {
        feeds.add(feed);
        this.saveList(feeds, prefs);
      }
    }
  }

  public void removeFeed(Feed feed)
  {
    if(feed != null)
    {
      SharedPreferences prefs = this.getSharedPreferences();
      ArrayList<Feed> feeds = this.getSavedList(prefs);
      if(feeds.contains(feed))
      {
        feeds.remove(feed);
        this.saveList(feeds, prefs);
      }
    }
  }

  public List<Feed> getFeeds()
  {
    SharedPreferences prefs = this.getSharedPreferences();
    return this.getSavedList(prefs);
  }

  private ArrayList<Feed> getSavedList(SharedPreferences prefs)
  {
    ArrayList<Feed> feeds = new ArrayList<Feed>();
    if(prefs != null)
    {
      String feedList = prefs.getString(FEED_LIST, null);
      if(feedList != null)
      {
        feeds = this.feedListFromJson(feedList);
      }
    }
    return feeds;
  }

  private void saveList(ArrayList<Feed> feeds, SharedPreferences prefs)
  {
    if(feeds != null && prefs != null)
    {
      SharedPreferences.Editor editor = prefs.edit();
      if(editor != null)
      {
        String json = this.feedListToJson(feeds);
        editor.putString(FEED_LIST, json);
        editor.commit();
      }
    }
  }

  protected SharedPreferences getSharedPreferences()
  {
    Context context = MainApplication.getContext();
    return context.getSharedPreferences(PREFERENCE, Context.MODE_PRIVATE);
  }

  private String feedListToJson(ArrayList<Feed> feeds)
  {
    Gson gson = new Gson();
    return gson.toJson(feeds);
  }

  private ArrayList<Feed> feedListFromJson(String json)
  {
    Type listType = new TypeToken<ArrayList<Feed>>(){}.getType();
    Gson gson = new Gson();
    return gson.fromJson(json, listType);
  }
}

Java Source Code List

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