Android Open Source - ToDoList Item List Manager

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License

The source code is released under:

GNU General Public License

Java Source Code

package ca.ualberta.cs.todolist;
/*from   w ww . j  a  v  a  2s. c  om*/
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;

import android.content.Context;
import   android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.util.Base64;

public class ItemListManager {
  //modified the following code based on 
  //https://github.com/abramhindle/student-picker/blob/master/src/ca/softwareprocess/studentpicker/StudentListManager.java
  static final String prefFile = "ItemListFile";
  static final String ilKey = "itemList"; 
  static final String prefFile2 = "ArchivedItemListFile";
  static final String ailKey = "archivedItemList";
  Context context;
  
  static private ItemListManager itemListManager = null;
  
  public ItemListManager(Context context) {
    this.context = context;
  }
  
  public static void initManager(Context context) {
    if (itemListManager == null) {
      if (context==null) {
        throw new RuntimeException("missing context for ItemListManager");
      }
      itemListManager = new ItemListManager(context);
    }  
  }
  
  public static ItemListManager getManager() {
    if (itemListManager == null) {
      throw new RuntimeException("Did not initialize Manager");
    }
    return itemListManager;
  }
  
  public ItemList loadItemList() throws ClassNotFoundException, IOException{
    SharedPreferences settings = context.getSharedPreferences(prefFile, Context.MODE_PRIVATE);
    String ItemListData = settings.getString(ilKey, "");
    if (ItemListData.equals("")){
      return new ItemList();
    }
    else{
      return itemListFromString(ItemListData);
    }   
  }
  
  public void saveItemList(ItemList item_list) throws IOException{
    SharedPreferences settings = context.getSharedPreferences(prefFile, Context.MODE_PRIVATE);
    Editor editor = settings.edit();
    editor.putString(ilKey, itemListToString(item_list));
    editor.commit();
  }
  
  public ItemList loadArchivedItemList() throws ClassNotFoundException, IOException{
    SharedPreferences settings = context.getSharedPreferences(prefFile2, Context.MODE_PRIVATE);
    String ArchivedItemListData = settings.getString(ailKey, "");
    if (ArchivedItemListData.equals("")){
      return new ItemList();
    }
    else{
      return itemListFromString(ArchivedItemListData);
    }   
  }
  
  public void saveArchivedItemList(ItemList item_list) throws IOException{
    SharedPreferences settings = context.getSharedPreferences(prefFile2, Context.MODE_PRIVATE);
    Editor editor = settings.edit();
    editor.putString(ailKey, itemListToString(item_list));
    editor.commit();
  }
  
  private ItemList itemListFromString(String itemListData) throws ClassNotFoundException, IOException {
    ByteArrayInputStream bi = new ByteArrayInputStream(Base64.decode(itemListData, Base64.DEFAULT));
    ObjectInputStream oi = new ObjectInputStream(bi);
    return (ItemList)oi.readObject();
  }
  
  private String itemListToString(ItemList item_list) throws IOException {
    ByteArrayOutputStream bo = new ByteArrayOutputStream();
    ObjectOutputStream oo = new ObjectOutputStream(bo);
    oo.writeObject(item_list);
    oo.close();
    byte bytes[] = bo.toByteArray();
    return Base64.encodeToString(bytes,Base64.DEFAULT);
  }
}

Java Source Code List

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