Question

In my app I save some files using FileOutputStream class:

    FileOutputStream fos;
    fos = openFileOutput("my_file", Context.MODE_PRIVATE);
    ObjectOutputStream os = new ObjectOutputStream(fos);
    os.writeObject(classToSave);
    os.close();

If I upgrade my app anche the I execute:

    FileInputStream fis = null;
    fis = openFileInput("my_file");
    ObjectInputStream is = new ObjectInputStream(fis);
    myData = (MyClass) is.readObject();
    is.close();

does fis is null or it contains the class that I saved before upgrade?

Answer 1

The file itself will be still there after the upgrade. If you can retrieve the serialised object depends on which changes you made to MyClass in the source code.