private void initializePreferenceButton() {
        Button preferenceButton = findViewById(R.id.preference_button);
        preferenceButton.setOnClickListener(createPreferenceButtonListener());
    }
private void initializePreferenceButton ( ) { Button preferenceButton = findViewById ( R . id . preference_button ) ; preferenceButton . setOnClickListener ( createPreferenceButtonListener ( ) ) ; }
Initializes the button, which allows to show a default {@link PreferenceActivity}.