Problems with singleton in android

Please browse this Android API FAQ topic , here you will surely find the most suitable solution for your problem (do you need short time, live or long-lasting data).

.

. , / ( /). , SharedPreferences .

/ SharedPreferences:

// the name with which to store the shared preference
public static final String PERSON_LIST = "my.personlist";

// a sample data structure that will be stored
public static final class Person
{
    private String name;
    private int age;

    public String toString() 
    {
        return name + "|" + age;
    }

    // splits the passed String parameter, and retrieves the members
    public static Person loadPersonFromString(final String personString)
    {
        final Person p = new Person();
        final String[] data = personString.split("|");
        p.name = data[0];
        p.age = Integer.parseInt(data[1]);
        return p;
    }
}

/**
 * Saves the current list of Persons in SharedPreferences 
 * @param persons: the list to save
 */
public void savePersonList(final ArrayList<Person> persons) 
{
    final SharedPreferences prefs = PreferenceManager.
        getDefaultSharedPreferences(getApplicationContext());
    final Editor editor = prefs.edit();
    final StringBuilder builder = new StringBuilder();
    for (final Person person : persons)
    {
        if (builder.length() > 0)
            builder.append("-Person-");
        builder.append(person.toString());
    }
    editor.putString(PERSON_LIST, builder.toString());
    editor.commit();
}

/**
 * Loads the list of Persons from SharedPreferences
 * @return the loaded list
 */
public ArrayList<Person> loadPersonList()
{
    final SharedPreferences prefs = PreferenceManager.
        getDefaultSharedPreferences(getApplicationContext());
    final ArrayList<Person> persons = new ArrayList<Menu.Person>();
    final String[] array = prefs.getString(PERSON_LIST, "").split("-Person-");
    for (final String personString : array) 
    {
        if (personString.length() > 0)
            persons.add(Person.loadPersonFromString(personString));
    }
    return persons;
}