android - adapter.notifyDataSetChanged() 在 android 中不工作

Question

这是我的代码，我将适配器设置为值 originalProductList，它最初有 0 个元素。稍后我将更新打印 1595(数据项数)的字段

private List<ParentListItem> originalProductList = new ArrayList<>();

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);


    recyclerView = (RecyclerView) findViewById(R.id.crime_recycler_view);
    recyclerView.setLayoutManager(new LinearLayoutManager(this));
    adapter = new MyAdapter(this, originalProductList);
    adapter.onRestoreInstanceState(savedInstanceState);
    recyclerView.setAdapter(adapter);

    getProducts();

}

private void getProducts() {
    if (Utility.getParentListItems().size() == 0) {
        final ProgressDialog loading = new ProgressDialog(ActivityProductList.this, R.style.MyTheme);
        loading.setCancelable(true);
        loading.show();

        Retrofit retrofit = new Retrofit.Builder()
                .baseUrl(Constants.BASERESTURL)
                .addConverterFactory(GsonConverterFactory.create())
                .build();

        RestInterface service = retrofit.create(RestInterface.class);
        Call<List<Product>> call = service.getProducts();

        call.enqueue(new Callback<List<Product>>() {

            @Override
            public void onResponse(Response<List<Product>> response, Retrofit retrofit) {
                List<Product> products = response.body();
                loading.dismiss();


                //logic to parse data
                Utility.setParentListItems(parentListItems);
                originalProductList.clear();
                originalProductList.addAll(Utility.getParentListItems());
                Utility.displayToast("in fetch: " + originalProductList.size());  // this prints 1595
                adapter.notifyDataSetChanged();


            }
            @Override
            public void onFailure(Throwable t) {
                //Utility.displaySnackBar(coordinatorLayout, "INTERNET CONNECTION LOST");
                Utility.displayToast("some error");
                loading.dismiss();
            }
        });
    }
}

调用此适配器.notifyDataSetChanged()；但它没有更新 UI，也没有错误。

逻辑上有什么问题？如何解决这个问题？

Answer 1

@Override
public void onResponse(Response<List<Product>> response, Retrofit retrofit) {
    List<Product> products = response.body();
    loading.dismiss();

    //logic to parse data
    Utility.setParentListItems(parentListItems);
    originalProductList.clear();
    originalProductList.addAll(Utility.getParentListItems());
    madapter.addData(originalProductList);
}


public class Adapter {
    ...
    private List<Product> product;

    public void addData(List<Product> product) {
        this.product= product;
        notifyDataSetChanged();
    }
}