Android Open Source - AndroidToDoList I O Manager

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License

The source code is released under:

GNU General Public License

Java Source Code

package com.example.todolist;
// ww  w . j ava2 s.  c  o  m
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.ArrayList;

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

public class IOManager {
  static final String mainFile = "main";
  static final String ArchiveFile = "archive";
  static final String mKey = "studentList";
  static final String aKey = "ArchiveList";
  
  Context context;
  
  private IOManager IOManager = null;
  
  public void initManager(Context context) {
    if (IOManager == null) {
      if (context==null) {
        throw new RuntimeException("missing context for IOManager");
      }
      IOManager = new IOManager(context);
    }    
  }
  
  public IOManager getManager() {
    if (IOManager==null) {
      throw new RuntimeException("Did not initialize Manager");
    }
    return IOManager;
  }
  
  
  public IOManager(Context context) {
    this.context = context;
  }

  public ArrayList<todoItem> loadArray() throws ClassNotFoundException, IOException {
    SharedPreferences settings = context.getSharedPreferences(mainFile, Context.MODE_PRIVATE);
    String ArrayData = settings.getString(aKey, "");
    if (ArrayData.equals("")) {
      return new ArrayList<todoItem>();
    } else {
      return ArrayListFromString(ArrayData);
    }
  }
  static public ArrayList<todoItem> ArrayListFromString(String ArrayData) throws ClassNotFoundException, IOException {
    ByteArrayInputStream bi = new ByteArrayInputStream(Base64.decode(ArrayData, Base64.DEFAULT));
    ObjectInputStream oi = new ObjectInputStream(bi);
    return (ArrayList<todoItem>) oi.readObject();  
  }
  static public String ArrayListToString(ArrayList<todoItem> al) throws IOException {
    ByteArrayOutputStream bo = new ByteArrayOutputStream();
    ObjectOutputStream oo = new ObjectOutputStream(bo);
    oo.writeObject(al);
    oo.close();
    byte bytes[] = bo.toByteArray();
    return Base64.encodeToString(bytes,Base64.DEFAULT);
  }
  
  public void saveArrayList(ArrayList<todoItem> al) throws IOException {
    SharedPreferences settings = context.getSharedPreferences(mainFile, Context.MODE_PRIVATE);
    Editor editor = settings.edit();
    editor.putString(mKey, ArrayListToString(al));
    editor.commit();
  }
}

Java Source Code List

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