public boolean ObjectToFile(String fileName, Object obj){
    boolean success = false;
    FileOutputStream fos = null;
    ObjectOutputStream out = null;
    try{
        File dir = GetAppDir();
        if(dir != null){
            fos = new FileOutputStream(dir + "/" + fileName);
            out = new ObjectOutputStream(fos);
            out.writeObject(obj);
            out.close();
            success = true;
        }
    }catch(Exception e){}
    return success;
}

public Object FileToObject(String fileName){
    Object obj = null;
    try{
        File dir = GetAppDir();
        if(dir != null){
            File f = new File(dir, fileName);
            if(f.exists() && f.isFile()){
                FileInputStream fis = null;
                ObjectInputStream in = null;
                fis = new FileInputStream(f);
                in = new ObjectInputStream(fis);
                obj = in.readObject();
                in.close();
            }
        }
    }catch(Exception e){}
    return obj;
}