我想使用Adapters和RecyclerViews 无休止地滚动代码，我正在使用 Volley 从 JSON 提取我的商品。尽管我已经阅读了这些指南（Codepath和github），但发现将其应用于自己的场景很困难。
我的json具有以下格式：
[{"id":"9","title":"Shokungeki no Souma","ano":"2016","categoria":"A\u00e7\u00e3o, Drama, Super Poderes, Vida Escolar, Romance","capa":"http:\/\/localhost:8080\/image\/2cc4dea4df2797c797615a0c7767878c1524864330_full.jpg","sinopse":"Obrigado e um canal de comunica\u00e7\u00e3o e marketing e comunica\u00e7\u00e3o visual e decidi que vou fazer"},{"id":"10","title":"Fate\/Stay Night","ano":"2006","categoria":"A\u00e7\u00e3o, Drama, Super Poderes, Vida Escolar, Romance","capa":"http:\/\/localhost:8080\/image\/IMG-20180912-WA0000.jpg","sinopse":"Obrigado e um canal de comunica\u00e7\u00e3o"},{"id":"11","title":"Sword Art Online","ano":"2015","categoria":"A\u00e7\u00e3o, Drama, Super Poderes, Vida Escolar, Romance","capa":"http:\/\/localhost:8080\/image\/FB_IMG_15366178545093060.jpg","sinopse":"Obrigado e um abra\u00e7o e at\u00e9 amanh\u00e3 de noite de sono \u00e9 um canal do le\u00e3o e Castela um abra\u00e7o a todas que est\u00e3o na mesma situa\u00e7\u00e3o e n\u00e3o consegui abrir"},{"id":"8","title":"Charlotte","ano":"2015","categoria":"A\u00e7\u00e3o, Drama, Super Poderes, Vida Escolar, Romance","capa":"http:\/\/localhost:8080\/image\/f67a9d25f1a79891bd8cc9e68bf6021c1435186459_full.jpg","sinopse":"Um n\u00famero muito reduzido de adolescentes possui poderes sobrenaturais. No entanto, todos esses poderes s\u00e3o imperfeitos, tendo, por isso, uma utilidade muito limitada. Otosaka Yuu \u00e9 um desses jovens e usa a sua habilidade de possuir outras pessoas por cinco segundos para ter uma vida escolar satisfat\u00f3ria e entrar numa escola prestigiosa, possuindo os melhores alunos e copiando-os. Contudo, certo dia \u00e9 denunciado por Tomori Nao, que tamb\u00e9m possui poderes e \u00e9 presidente da Associa\u00e7\u00e3o de Estudantes da Academia Hoshinoumi, institui\u00e7\u00e3o destinada \u00e0queles com habilidades sobrenaturais. O seu encontro leva Yuu a transferir-se para a Academia Hoshinoumi e, assim, a descobrir o duro destino daqueles que possuem poderes."}]
以下是我正在使用的代码：
片段：
public class AllFragment extends Fragment {
private RecyclerView recyclerView;
private AVLoadingIndicatorView avi;
private GridLayoutManager gridLayoutManager;
private Data2Adapter adapter;
private List<Data> data_list;
Boolean isScrolling = false;
int currentItems, totalItems, scrollOutItems;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_all, container, false);
recyclerView = (RecyclerView) view.findViewById(R.id.recycler_all);
avi = (AVLoadingIndicatorView) view.findViewById(R.id.fragmentallProgress);
data_list = new ArrayList<>();
load_data_from_server(0);
avi.show();
gridLayoutManager = new GridLayoutManager(getContext(),2);
recyclerView.setLayoutManager(gridLayoutManager);
adapter = new Data2Adapter(getContext(),data_list);
recyclerView.setAdapter(adapter);
recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
@Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
}
});
return view;
}
private void load_data_from_server(int id) {
String url = "http://localhost:8000/getanimes.php?filter=#";
StringRequest stringRequest = new StringRequest(url, new Response.Listener<String>() {
@Override
public void onResponse(String response) {
try
{
JSONArray array = new JSONArray(response);
for (int i=0; i<array.length(); i++){
JSONObject object = array.getJSONObject(i);
Data data = new Data(object.getInt("id"),object.getString("title"),
object.getString("capa"));
data_list.add(data);
}
}
catch (JSONException e)
{}
adapter.notifyDataSetChanged();
avi.hide();
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(getContext(), "Ocorreu um erro inesperado!", Toast.LENGTH_SHORT).show();
}
});
RequestQueue requestQueue = Volley.newRequestQueue(getContext());
requestQueue.add(stringRequest);
}
}
适配器：
public class Data2Adapter extends RecyclerView.Adapter<Data2Adapter.ViewHolder> {
private Context context;
private List<Data> my_data;
public Data2Adapter(Context context, List<Data> my_data) {
this.context = context;
this.my_data = my_data;
}
@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View itemView = LayoutInflater.from(parent.getContext()).inflate(R.layout.anim_grid,parent,false);
return new ViewHolder(itemView);
}
@Override
public void onBindViewHolder(ViewHolder holder, int position) {
holder.description.setText(my_data.get(position).getTitle());
Glide.with(context).load(my_data.get(position).getCapa()).into(holder.imageView);
}
@Override
public int getItemCount() {
return my_data.size();
}
public class ViewHolder extends RecyclerView.ViewHolder{
public TextView description;
public ImageView imageView;
public ViewHolder(View itemView) {
super(itemView);
description = (TextView) itemView.findViewById(R.id.textview7);
imageView = (ImageView) itemView.findViewById(R.id.imageview1);
}
}
}
型号：
public class Data {
private int id;
private String title,capa;
public Data(int id, String title, String capa) {
this.id = id;
this.title = title;
this.capa = capa;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getCapa() {
return capa;
}
public void setCapa(String capa) {
this.capa = capa;
}
}
答案 0 :(得分：3)
更改适配器的此覆盖方法：
@Override
public int getItemCount() {
return Integer.MAX_VALUE;
}
并使用此方法通过位置获取模型对象：
private Data getItem(int position) {
return my_data.get(position % my_data.size());
}
由于您使用的是RecyclerView，因此不会创建新对象，并且列表中会重复填充您的商品。