在按钮上单击它会更新第二个活动微调器和textviews

Question

I am creating an app which has 2 activities. Main activity has three buttons with different movie genre. On clicking any of the three buttons it should go to the second activity which consists of:

2 spinners: to display movie name and 1 for movie time 2 textview to display movie rating and casts textview to open calendar

the spinners should be updated depending on the movie genre selected as well as the textviews for movie rating and cast

So far i have created the XML for main activity and class to make an arraylist to hold the movie details. I also did intent to go to next page but i am confused on how to display movies in spinner only for selected genre.

Answer 1

The simplest way would be to pass something to the next activity:

Intent i = new Intent(context,activity2.class);
i.putExtra("genre", mGenre);  
startActivity(i);  

Then in activity2 on load you can pull the genre:

String genre = getintent().getStringExtra("genre");  

Then you fill the lists based off the genre. You could pass an int as well if you dont feel like dealing with strings.

Answer 2

You should make your movie class Serializable in order to pass it to next Activity. There are different ways to achieve that which I have mentioned two in below:

1. http://www.parcelabler.com/
2. https://github.com/johncarl81/parceler

Then you can pass your ArrayList to the second activity.

FirstActivity

ArrayList<Movie> myMovieList = new ArrayList<>();
...
Intent intent = new Intent(context, secondActivity.class);
i.putExtra("my_movie_list", myMovieList);  
startActivity(i); 

SecondActivity

ArrayList<Movie> myMovieList = getintent().getExtra("my_movie_list");  

Update (Extracting specific movies from movie list):

        List<Movie> selectedMovieList = new ArrayList<>();
        for(int i=0 ; i < movieList.size(); i++ ) {
            if(movieList.get(i).getGenre().equals("selected_genre_name")) {
                selectedMovieList.add(movieList.get(i));
            }
         }