how to get a variable in an activity from another activity and make the main activity to use variable after initializing from there ?(kotlin ) my kotlin project has 2 activitis (main , second called : AddPlayer) main activity has a button called "Add a player" that it starts second activity . in second activity i have 2 edit text to get a number and a text from user . after press submit button in second activity , in the main activity i want add these values to my mutablelist but idk how to do it ( i think it crashed because main activity uses those variables before getting values from user) plz guide me . my activity code : class...