java - Unable to pass array of objects via intent extras -

i'm passing arraylist of movie objects mainactivity detailactivity via intent.

intent.putextra(key_mfavoritemovies, mfavoritemovies); startactivity(intent); 

in other activity, i'm adding additional movie objects.

mfavoritemovies(movie); 

however, mfavoritemovies in mainactivity not appear contain additional movie objects.

is behavior expected?

that expected behaviour because when modify array list @ detailactivity working different instance of movies list.

you can changes make list starting detailactivity startactivityforresult , sending updated list mainactivity

you have @ mainactivity

arraylist<string> mmovies; int detail_request_code = 123; string key_favorite_movies = "key-movies";  private void startdetailactivity() {     intent intent = new intent(this, detailactivity.class);     intent.putstringarraylistextra(key_favorite_movies, mmovies);     startactivityforresult(intent, detail_request_code); }  @override protected void onactivityresult(int requestcode, int resultcode, intent data) {     if (requestcode == detail_request_code && resultcode == result_ok) {         mmovies = data.getstringarraylistextra(key_favorite_movies);     } } 

and have send updated list detailactivity this:

public void finishdetail() {     intent resultintent = new intent();     resultintent.putstringarraylistextra(key_favorite_movies, mmovies);     setresult(activity.result_ok, resultintent);     finish(); }