Creating the SharedPreference utility

The SharedPreference utility class acts as an interface between the XML key value pair to read and write the data. We will create three methods for saving notes, fetching all the notes, and removing one particular note: 

• saveNote(..);
• getAllNotes(..);
• removeNote(..);

Inside the util package, let's create two Java classes called Constants.java and SharedPreferencesUtils.java.

Inside Constants.java, let's add the following constants:

public static final String NOTE_ID = "NOTE_ID";
public static final String NOTE_TITLE = "NOTE_TITLE";
public static final String NOTE_LIST = "NOTE_LIST";
public static final String ACTION = "ACTION";
public static final String ITEM_POSITION = "ITEM_POSITION";

public static final int ACTION_ADD = 9001;
public static final int ACTION_DELETE = 9002;
public static final int ACTION_SYNC = 9003;

The complete class looks as follows:

package com.ashok.packt.wear_note_1.utils;

/**
 * Created by ashok.kumar on 15/02/17.
 */

public class Constants {

 public static final String NOTE_ID = "NOTE_ID";
 public static final String NOTE_TITLE = "NOTE_TITLE";
 public static final String NOTE_LIST = "NOTE_LIST";
 public static final String ACTION = "ACTION";
 public static final String ITEM_POSITION = "ITEM_POSITION";

 public static final int ACTION_ADD = 9001;
 public static final int ACTION_DELETE = 9002;
 public static final int ACTION_SYNC = 9003;

}

Now, it's the time to work on the SharedPreferencesUtils.java class. In this class, we will create the methods to save data, retrieve data, and delete data.