Android Preferences Example

PersistenceManager.java

import android.content.Context;

import com.whp.android.SharedPreferencesDao;
import com.whp.android.serialization.SerializationUtils;

import java.io.IOException;

public class PersistenceManager {

	/**
	 * Property Name : PREFERENCE_KEY
	 * 
	 */
	public static final String PREFERENCE_KEY_SUFFIX = "preferences";

	/**
	 * Property Name : PREFERENCE_GENERAL_SETTINGS
	 * 
	 */
	public static final String PREFERENCE_GENERAL_SETTINGS = "PREFERENCE_GENERAL_SETTINGS";

	/**
	 * getSettings
	 * 
	 * @return
	 * @throws IOException
	 * @throws ClassNotFoundException
	 */
	public static Settings getSettings(Context context) throws IOException, ClassNotFoundException {

		SharedPreferencesDao preferences;
		String tmp;
		String preferencesKey = context.getPackageName () + "." + PREFERENCE_KEY_SUFFIX;

		preferences = new SharedPreferencesDao (context, preferencesKey);

		tmp = preferences.get (PREFERENCE_GENERAL_SETTINGS);
		if ((tmp != null) && (!"".equals (tmp))) {
			return (Settings) SerializationUtils.fromString (tmp);
		} else {
			return new Settings ();
		}
	}

	/**
	 * setSettings
	 * 
	 * @param settings
	 * @throws IOException
	 */
	public static void setSettings(Context context, Settings settings) throws IOException {

		SharedPreferencesDao preferences;
		String preferencesKey = context.getPackageName () + "." + PREFERENCE_KEY_SUFFIX;

		preferences = new SharedPreferencesDao (context, preferencesKey);

		if (settings != null) {
			preferences.add (PREFERENCE_GENERAL_SETTINGS, SerializationUtils.toString (settings));
		} else {
			preferences.delete (PREFERENCE_GENERAL_SETTINGS);
		}

	}
}

Sample use

	private boolean getBooleanValue () {

		//	Get stored information about the game
		Settings settings = null;
		try {
			settings = PersistenceManager.getSettings(this);
		} catch (IOException e) {
			//	TODO : Ignore this, should not happen
			e.printStackTrace ();
			return false;
		} catch (ClassNotFoundException e) {
			//	TODO : Ignore this, should not happen
			e.printStackTrace ();
			return false;
		}

		return settings.getBooleanValue();

	}

Settings.java

import java.io.Serializable;

public class Settings implements Serializable {


	private static final long serialVersionUID = -4079752511950172473L;

	private Boolean booleanValue;
  private Integer integerValue;
  private String stringValue;
  
	/**
	 * Constructor
	 */
	public Settings () {
		this.booleanValue = false;
	}

	public Bool getBooleanValue () {

		return booleanValue;
	}

	public void setBooleanValue (Boolean booleanValue) {

		this.booleanValue = booleanValue;
	}

	//  And so
}