android – 如何从Retrofit的函数onResponse返回值并在其他过程中调用它？

我是改装的新手,我想让我的getData列表从onResponse正文列表中保存值,并在不同的程序中调用它.最简单的方法是什么？
我一直在尝试它,数据已经在onResponse中显示但是当我想在不同的过程中使用它时,值getData列表仍为null

我的onCreate

@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
   // getDataSeason();
    listSeason=new ArrayList<>();
    progress = new ProgressDialog(getActivity());
    progress.setCancelable(false);
    progress.setMessage("Loading. . .");
    progress.show();

    Retrofit retrofit = new Retrofit.Builder()
            .baseUrl(getURL.GetMyURL())
            .addConverterFactory(GsonConverterFactory.create())
            .build();
    SeasonAPI api = retrofit.create(SeasonAPI.class);

    Call<SeasonList> call = api.getAllSeason();
    call.enqueue(new Callback<SeasonList>() {
        @Override
        public void onResponse(Call<SeasonList> call, Response<SeasonList> response) {
            progress.dismiss();
            response.body();
            for(int i=0;i<response.body().getResult().size();i++){
                getData.add(i,response.body().getResult().get(i));
            }
        }

        @Override
        public void onFailure(Call<SeasonList> call, Throwable t) {
            t.printstacktrace();
            progress.dismiss();
            Toast.makeText(getActivity(),"Network Connection Error",Toast.LENGTH_SHORT).show();
        }

    });}

字符串临时

我的getData列表

public class FragmentPromo extends Fragment {

public List<Season> getData;

我的季节清单

public class SeasonList {
@Serializedname("value")
@Expose
private Integer value;
@Serializedname("result")
@Expose
private List<Season> result = null;

public Integer getValue() {
    return value;
}

public void setValue(Integer value) {
    this.value = value;
}

public List<Season> getResult() {
    return result;
}

public void setResult(List<Season> result) {
    this.result = result;
}}

当我想在onc​​reateView中显示getData值时,它为null

public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    View view= inflater.inflate(R.layout.fragment_promo,container,false);
    //Set date in Text View
    txtDate=(TextView)view.findViewById(R.id.txtDateTime);
    txtDate.setText(currendtDateTimeString);

    myRecycleView=(RecyclerView)view.findViewById(R.id.season_view);
    recycleViewAdapterSeason =new RecycleViewAdapterSeason(getContext(),listSeason);
    myRecycleView.setLayoutManager(new linearlayoutmanager(getActivity()));
    myRecycleView.setAdapter(recycleViewAdapterSeason);
    getDataSeason();
    Toast.makeText(getActivity(),getData.get(0).getNamaSeason(),Toast.LENGTH_SHORT).show();

    return view;
}

解决方法:

>首先,在处理Retrofit时,最好制作一个Singleton类,你可以阅读这个设计模式以及它在内存管理方面是如何帮助的
>其次,在onResponse()为什么你在循环之前调用response.body()而不使用它？
>您将获得空指针异常,因为您希望在不初始化的情况下使用列表
>所有你要做的就是从SesaonList类创建一个对象并将它的值赋给你的响应,getData将通过调用getResult从对象获取season的列表来分配,这应该工作

@覆盖
        public void onResponse(Call< SeasonList> call,Response< SeasonList> response){
            progress.dismiss();
            Seasonlist seasonlist = response.body();
            getData = seasonlist.getResult();
}