shared preferences backup (working).txt

private boolean saveSharedPreferencesToFile(File dst) {
    boolean res = false;
    ObjectOutputStream output = null;
    try {
        output = new ObjectOutputStream(new FileOutputStream(dst));
        SharedPreferences pref = 
                            getSharedPreferences(prefName, MODE_PRIVATE);
        output.writeObject(pref.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" })
private boolean loadSharedPreferencesFromFile(File src) {
    boolean res = false;
    ObjectInputStream input = null;
    try {
        input = new ObjectInputStream(new FileInputStream(src));
            Editor prefEdit = getSharedPreferences(prefName, MODE_PRIVATE).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;
}