Question

Cast_detail_fragment：

public class Cast_detail_fragment extends Fragment {

    VolleySingleton volleySingleton;
    RequestQueue requestQueue;
    Cast_detail_adapter adapter;
    private ArrayList<cast_class_details> castlist=new ArrayList<>();
    RecyclerView cast_recycler;



    public Cast_detail_fragment() {
        // Required empty public constructor
    }


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


        final LinearLayoutManager layoutManager = new LinearLayoutManager(getActivity());
        layoutManager.setOrientation(LinearLayoutManager.VERTICAL);
        cast_recycler.setLayoutManager(layoutManager);
        //cast_recycler.setLayoutManager(new LinearLayoutManager(getActivity()));
        adapter=new Cast_detail_adapter(getActivity());
        cast_recycler.setAdapter(adapter);
        getdata();
        adapter.setcastlist(castlist);
       // Toast.makeText(getActivity(),"far",Toast.LENGTH_LONG).show();

        return view;
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        volleySingleton = VolleySingleton.getInstance();
        requestQueue = volleySingleton.getRequestQueue();
    }

    private void getdata() {
        JsonObjectRequest objectRequest = new JsonObjectRequest(Request.Method.GET,"http://api.rottentomatoes.com/api/public/v1.0/movies/770672122/cast.json?apikey=54wzfswsa4qmjg8hjwa64d4c", (String) null, new Response.Listener<JSONObject>() {
            @Override
            public void onResponse(JSONObject response) {

                parseData(response);
                // setData();

            }
        }, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError error) {
                Toast.makeText(getActivity(), "error volley", Toast.LENGTH_SHORT).show();

            }
        });
        requestQueue.add(objectRequest);
    }

    private void parseData(JSONObject response) {
        try {
            String chara;
            String name;
            JSONArray cast= response.getJSONArray("cast");
            JSONObject cast_object;
            for(int i=0;i<cast.length();i++){
                cast_object=cast.getJSONObject(i);
                name=cast_object.getString("name");
                //Toast.makeText(this, name, Toast.LENGTH_LONG).show();
                JSONArray character=cast_object.getJSONArray("characters");
                if(!character.isNull(0)){
                    chara=character.getString(0);
                }else{
                    chara="";
                }
                cast_class_details cast_class_object=new cast_class_details();
                cast_class_object.character=chara;
                cast_class_object.name=name;
                castlist.add(cast_class_object);

            }
            Toast.makeText(getActivity(), "done", Toast.LENGTH_LONG).show();
            Toast.makeText(getActivity(),String.valueOf(castlist.size()),Toast.LENGTH_LONG).show();

        } catch (JSONException e) {
            e.printStackTrace();
            Toast.makeText(getActivity(),"error",Toast.LENGTH_SHORT).show();
        }
    }

}

Fragment_cast_detail.xml

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.mohd.materialdesign.Cast_detail_fragment">

    <!-- TODO: Update blank fragment layout -->
    <android.support.v7.widget.RecyclerView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_marginBottom="20dp"
        android:id="@+id/fragment_cast_recycler"
        android:layout_marginLeft="10dp"
        android:layout_marginRight="10dp"/>

</FrameLayout>

Class_detail_adapter：

  public LayoutInflater layoutinflater;
    ArrayList<cast_class_details> castlist=new ArrayList<cast_class_details>();


    public Cast_detail_adapter(Context context)
    {

        layoutinflater=LayoutInflater.from(context);
    }

    public void setcastlist(ArrayList<cast_class_details> castlist){
        this.castlist=castlist;
        notifyItemRangeChanged(0,castlist.size());
      //  Toast.makeText(this,String.valueOf(castlist.size()),Toast.LENGTH_SHORT).show();
    }

    @Override
    public Myholder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view= layoutinflater.inflate(R.layout.custom_cast_row,parent,false);
        Myholder viewholder=new Myholder(view);
        return viewholder;
    }

    @Override
    public void onBindViewHolder(Myholder holder, int position) {
        cast_class_details cast_class_object=castlist.get(position);
       // holder.name.setText(cast_class_object.name);
       // holder.character.setText(cast_class_object.character);
        holder.name.setText(String.valueOf(castlist.size()));
        holder.character.setText("yo");

    }



    @Override
    public int getItemCount() {

        return castlist.size();
    }


    class Myholder extends RecyclerView.ViewHolder{
        TextView name,character;

        public Myholder(View itemView) {
            super(itemView);
            name= (TextView) itemView.findViewById(R.id.cast_name);
            character= (TextView) itemView.findViewById(R.id.cast_character);
        }
    }
}

custom_cast_row：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:text="Large Text"
        android:id="@+id/cast_name"
        android:layout_marginTop="15dp"
        android:layout_marginLeft="15dp" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceMedium"
        android:text="Medium Text"
        android:id="@+id/cast_character"
        android:layout_marginLeft="20dp"
        android:layout_marginTop="8dp"
        android:layout_marginBottom="15dp" />
</LinearLayout>

我已经显示了toast来检查片段是否正常工作并且它完全正常。 Toast显示“完成”和获取的演员表数量。但仍然片段显示空白似乎适配器或回收者视图似乎不起作用。请帮忙，谢谢。

Answer 1

 public void setcastlist(ArrayList<cast_class_details> castlist){
    this.castlist=castlist;
    notifyItemRangeChanged(0,castlist.size());
  //  Toast.makeText(this,String.valueOf(castlist.size()),Toast.LENGTH_SHORT).show();
}

替换为

  public void setcastlist(ArrayList<cast_class_details> castlist){
    this.castlist=castlist;
    notifyDataSetChanged();
  //  Toast.makeText(this,String.valueOf(castlist.size()),Toast.LENGTH_SHORT).show();
}

有关详细信息，请参阅https://stackoverflow.com/a/32769238/3817374。

Answer 2

下面：

getdata(); //<<<
adapter.setcastlist(castlist);

setcastlist在调用getdata方法后执行，无需等待调用parseData方法，在castlist ArrayList中添加新项目。

要使其工作，请adapter.setcastlist或parseData方法移动onResponse：

 @Override
 public void onResponse(JSONObject response) {
    parseData(response);
    castlist.clear(); 
    adapter.setcastlist(castlist);
 }

为什么我的Recycler适配器/ Recycler视图没有连接到片段而没有显示？

2 个答案: