Question

我的recyclerview没有在片段内填充。我从凌空得到了适当的回应。我已经以正确的格式解析了arraylist中的JSON，唯一的问题是 recyclerview没有填充。

MyFragment.java

@Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        View view = inflater.inflate(R.layout.fragment_undekha_tadka, container, false);
        recyclerView = (RecyclerView) view.findViewById(R.id.recyclerView);
        myVolleyOperation(view);
        return view;
    }

    private void myVolleyOperation(View v) {
        volleySingleton = VolleySingleton.getInstance();
        requestQueue = volleySingleton.getRequestQueue();
        String url = "http://abcd.com/undekha.html";

        StringRequest stringRequest = new StringRequest(Request.Method.GET, url, new Response.Listener<String>() {
            @Override
            public void onResponse(String response) {
                jsonParsing(response);
                Toast.makeText(getContext(), response, Toast.LENGTH_SHORT).show();
            }
        }, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError error) {
                Toast.makeText(getContext(), "ERROR\n" + error.toString(), Toast.LENGTH_SHORT).show();
            }
        });

        requestQueue.add(stringRequest);

        recyclerViewAdapter = new RecyclerViewAdapter(undekhaList, v.getContext());
        layoutManager = new LinearLayoutManager(getContext());
        recyclerView.setLayoutManager(layoutManager);
        recyclerView.setAdapter(recyclerViewAdapter);
    }

RecyclerViewAdapter.java

public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerViewAdapter.RecyclerViewHolder> {
    ArrayList<UndekhaModel> myArrayList = new ArrayList<>();
    Context context;

    VolleySingleton volleySingleton;
    ImageLoader imageLoader;

    public RecyclerViewAdapter(ArrayList<UndekhaModel> myArrayList, Context context) {
        this.myArrayList = myArrayList;
        this.context = context;

        volleySingleton = VolleySingleton.getInstance();
        imageLoader = volleySingleton.getImageLoader();
    }

    @Override
    public RecyclerViewAdapter.RecyclerViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.single_row, parent, false);
        RecyclerViewHolder recyclerViewHolder = new RecyclerViewHolder(view, context, myArrayList);

        return recyclerViewHolder;
    }

    @Override
    public void onBindViewHolder(final RecyclerViewAdapter.RecyclerViewHolder holder, int position) {
        UndekhaModel undekhaModel = myArrayList.get(position);

        holder.title.setText(undekhaModel.getTitle());

        String loadUrl = "http://img.youtube.com/vi/" + undekhaModel.getId() + "/0.jpg";
        if (loadUrl!=null){
            imageLoader.get(loadUrl, new ImageLoader.ImageListener() {
                @Override
                public void onResponse(ImageLoader.ImageContainer response, boolean isImmediate) {
                    holder.thumbnail.setImageBitmap(response.getBitmap());
                }

                @Override
                public void onErrorResponse(VolleyError error) {
                    holder.thumbnail.setImageResource(R.mipmap.ic_launcher);
                }
            });
        }
    }

    @Override
    public int getItemCount() {
        return myArrayList.size();
    }

    public static class RecyclerViewHolder extends RecyclerView.ViewHolder {

        TextView title;
        ImageView thumbnail;
        ArrayList<UndekhaModel> modelArrayList = new ArrayList<>();
        Context context;

        public RecyclerViewHolder(View itemView, final Context ctx, final ArrayList<UndekhaModel> modelArrayList) {
            super(itemView);
            this.context = ctx;
            this.modelArrayList = modelArrayList;

            title = (TextView) itemView.findViewById(R.id.tvTitle);
            thumbnail = (ImageView) itemView.findViewById(R.id.ivShow);
        }
    }
}

Answer 1

您的方法jsonParsing()需要填充RecyclerViewAdapter的数据，需要通知更新，适配器需要返回正在管理的项目的正确数量。现在它的getItemCount()总是返回0，所以RecyclerView认为没有任何东西要显示。

Answer 2

与此相同的问题

https://stackoverflow.com/a/35802948/2144418

尝试在布局管理器之前设置适配器

将 myVolleyOperation 的最后两行更改为此

recyclerView.setAdapter(recyclerViewAdapter);
recyclerView.setLayoutManager(layoutManager);

RecyclerView不使用齐射填充片段内部

2 个答案: