What is the correct way to use SharedPreferences for Switch?

Question

Java

It is necessary that when you press the button every time you press it, the value changes, and when you restart the application, this value remains.
Change of value works now. But it is not saved.
I added SharedPreferences, but I know it's not correct, I took it from saving in the settings for strings. But how to do for switch?

def_pref = PreferenceManager.getDefaultSharedPreferences(this);
        String text_shar = def_pref.getString("key", "Шар");
        if (text_shar != null) {
                status_pub++;
                switch (status_pub) {
                    case 0:
                        button.setText("");
                        status_pub = 0;
                        break;
                    case 1:
                        button.setText("AAA");
                        status_pub = 1;
                        break;
                    case 2:
                        button.setText("BBB");
                        status_pub = 2;
                        break;
                    case 3:
                        button.setText("CCC");
                        status_pub = 0;
                        break;
                }
            }
        }

Answer 1

SharedPreferences#getBoolean