Saving some data in Kotlin fragments I have 2 fragments, first(start_fragment) should shows when app starts and have 2 buttons, 1 which close app(declineButton), and second which hide this fragment and show main fragment(webview_fragment). If user press agreeButton, next time app will starts already in main fragment(webview_fragment). How could i save that user press agree button? I tried to create boolean variable but can't imagine how can i put new value from button within fragment to variable within mainactivity....