Removing Android framework dependency in the `PresenterManager` class

[vishnuharidas]

The PresenterManager class currently accepts a Bundle object passed via the savePresenter(BasePresenter<?, ?> presenter, Bundle outState) and the restorePresenter(Bundle savedInstanceState) to keep a reference of a presenter. This makes a dependency on the Android framework.

What about passing a unique key string from the Activity (or Fragment) that uses this presenter? This will remove the dependency on the Bundle class as well.

For example,

• savePresenter(BasePresenter<?, ?> presenter, String key)
• restorePresenter(String key)

and in Activity's onCreate() method,

    private static final String MY_ACTIVITY_KEY = "login_activity";
    .....
    if (savedInstanceState == null) {
        presenter = new MainPresenter();
    } else {
        presenter = PresenterManager.getInstance().restorePresenter(MY_ACTIVITY_KEY);
    }