如何从 Retrofit onResponse 获取数据

Question

I want to get an ArrayList<ItemList> from my Retrofit Callback and save it in as a ArrayList variable in my class. In other word I need to use data from retrofitList even when I leave the onResponse method. What is the best way to do it? Here is my code.

@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    retrofitList = new ArrayList<>();

    Retrofit retrofit = new Retrofit.Builder()
            .baseUrl("https://b98afcf5.ngrok.io/")
            .addConverterFactory(GsonConverterFactory.create())
            .build();
    jsonPlaceHolder = retrofit.create(JsonPlaceHolder.class);

    Call<List<ItemList>> call = jsonPlaceHolder.getItemList();
    call.enqueue(new Callback<List<ItemList>>() {
        @Override
        public void onResponse(Call<List<ItemList>> call, Response<List<ItemList>> response) {
            if(!response.isSuccessful()) {
                return;
            }
            List<ItemList> listOfitems = response.body();
            for(ItemList itemList : listOfitems){
                retrofitList.add(new ItemList(itemList.getId(),
                        itemList.getName(),
                        itemList.getPhone(),
                        itemList.getIsLocated()));
            }
            //I WANT TO SAVE "retrofitList" INTO MY CLASS FROM HERE
        }

        @Override
        public void onFailure(Call<List<ItemList>> call, Throwable t) {}
    });
}

Answer 1

I recommend serialization it will make your life easier. Try this and this . Create a method in your class that you will call from onResponse with your list. Save the list in some field variable. If you call this variable before it is filled with items from onResponse it won't have them.