如何在片段中实现分页库

Question

所以我尝试实现分页库，但是由于 PageKeyedDataSource 是一个抽象类，所以我无法在Fragment中实现它。

这是我到目前为止所做的，但是正如您在我的API调用中所看到的那样，我正在制作该片段的实例-categoryFragment.getCategoryName（）是执行此操作的一种不好的方法。我不知道该如何传递，因为我不能使用sharedPreferences。

片段

  public void callComponents() {
        mainActivityViewModel.getPagedListLiveData().observe(this, new Observer<PagedList<Component.Rows>>() {
            @Override
            public void onChanged(@Nullable PagedList<Component.Rows> photos) {
                componentAdapter = new ComponentAdapter(getActivity(),photos);
                componentAdapter.submitList(photos);
                recyclerView.setAdapter(componentAdapter);

            }

        });

API调用

 List<Component.Rows> list;
    CategoryFragment categoryFragment = new CategoryFragment();
    @Override
    public void loadInitial(@NonNull LoadInitialParams<Long> params, @NonNull final LoadInitialCallback<Long, Component.Rows> callback) {

        JsonPlaceHolderApi api = ApiClient.getClient().create(JsonPlaceHolderApi.class);
        Call<Component.Rows> data =
                api.listComponents(API,categoryFragment.getCategoryName(),"purchase_cost");
        list = new ArrayList<>();
        data.enqueue(
                new Callback<Component.Rows>() {
                    @Override

                    public void onResponse(Call<Component.Rows> call, Response<Component.Rows> response) {
                        for (int i = 0; i < response.body().getRows().size(); i++) {
                            Component.Rows photosList = response.body();
                            list.add(photosList);
                        }
                        callback.onResult(list,
                                null, (long) 2);
                    }

                    @Override

                    public void onFailure(Call<Component.Rows> call, Throwable t) {
                    }
                });
...other methods
    }

ViewModel

public MainActivityViewModel(@NonNull Application application) {

        super(application);

        photoDataSourceFactory = new PhotoDataSourceFactory();

        dataSourceMutableLiveData = photoDataSourceFactory.getMutableLiveData();
        PagedList.Config config = (
                new PagedList.Config.Builder())
                .setEnablePlaceholders(
                        true)
                .setInitialLoadSizeHint(10)
                .setPageSize(4)
                .setPrefetchDistance(4)
                .build();

        executor = Executors.newFixedThreadPool(5);

        pagedListLiveData = (new LivePagedListBuilder<Long, Component.Rows>(photoDataSourceFactory, config))
                .setFetchExecutor(
                        executor)
                .build();
    }

    public LiveData<PagedList<Component.Rows>> getPagedListLiveData() {
        return pagedListLiveData;
    }

}