SharedPreferencesUtils.java

package com.asksven.android.common.utils;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.Map;
import java.util.Map.Entry;

import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;

public class SharedPreferencesUtils {

	public static boolean saveSharedPreferencesToFile(SharedPreferences prefs, String file)
	{
		boolean res = false;
		ObjectOutputStream output = null;
		File dst = null;
		try
		{
			dst = new File(file);
			output = new ObjectOutputStream(new FileOutputStream(dst));

			output.writeObject(prefs.getAll());

			res = true;
		}
		catch (FileNotFoundException e)
		{
			e.printStackTrace();
		}
		catch (IOException e)
		{
			e.printStackTrace();
		}
		finally
		{
			try
			{
				if (output != null)
				{
					output.flush();
					output.close();
				}

			}
			catch (IOException ex)
			{
				ex.printStackTrace();
			}
		}
		return res;
	}

	@SuppressWarnings({ "unchecked" })
	public static boolean loadSharedPreferencesFromFile(SharedPreferences prefs, String file)
	{
		boolean res = false;
		ObjectInputStream input = null;
		File src = null;
		try
		{
			src = new File(file);
			input = new ObjectInputStream(new FileInputStream(src));
			Editor prefEdit = prefs.edit();
			prefEdit.clear();
			Map<String, ?> entries = (Map<String, ?>) input.readObject();
			for (Entry<String, ?> entry : entries.entrySet())
			{
				Object v = entry.getValue();
				String key = entry.getKey();

				if (v instanceof Boolean)
					prefEdit.putBoolean(key, ((Boolean) v).booleanValue());
				else if (v instanceof Float)
					prefEdit.putFloat(key, ((Float) v).floatValue());
				else if (v instanceof Integer)
					prefEdit.putInt(key, ((Integer) v).intValue());
				else if (v instanceof Long)
					prefEdit.putLong(key, ((Long) v).longValue());
				else if (v instanceof String)
					prefEdit.putString(key, ((String) v));
			}
			prefEdit.commit();
			res = true;
		}
		catch (FileNotFoundException e)
		{
			e.printStackTrace();
		}
		catch (IOException e)
		{
			e.printStackTrace();
		} 
		catch (ClassNotFoundException e)
		{
			e.printStackTrace();
		}
		finally
		{
			try
			{
				if (input != null)
				{
					input.close();
				}
			}
			catch (IOException ex)
			{
				ex.printStackTrace();
			}
		}
		return res;
	}
}