带有翻新自定义列表的Cheesesquare-master

Question

我想更改Cheesesquare-master Git链接 cheesesquare-master

使用翻新从我的网站加载列表

https://www.youtube.com/watch?v=FFHGkuWUsXg

http://www.jsonschema2pojo.org/

但不幸的是，我无法从我的网站加载。

此MainActivity.java是默认的Cheesesquare主活动。我刚刚更改了适配器片段类（FoodListFragment）。

That Foodlist fragment class initially set by random list using setupRecyclerView
recyclerView.setAdapter(new SimpleStringRecyclerViewAdapter(getActivity(),
               getRandomSublist(Cheeses.sCheeseStrings, 5)));

在这里，我想更改随机列表以从Web加载。

我的MainActivity.java

    private void setupViewPager(ViewPager viewPager) {
        Adapter adapter = new Adapter(getSupportFragmentManager());
        adapter.addFragment(new CheeseListFragment(), "Home");
        adapter.addFragment(new FoodListFragment(), "Message");
        //adapter.addFragment(new FoodlistAdapter(), "Message");
        adapter.addFragment(new CheeseListFragment(), "Home Work");
        viewPager.setAdapter(adapter);
    }

FoodListFragment.Java

    public class FoodListFragment extends Fragment {

        private RecyclerView mProductRView;
        private LinearLayoutManager mLayoutManager;
        private ArrayList<LoadAbout> mProductList = new ArrayList<>() ;
        private FoodlistAdapter mProductAdapter;
        private APIInterface mAPIInterfacel;

        @Nullable
        @Override
        public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
            RecyclerView rv = (RecyclerView) inflater.inflate(
                    R.layout.fragment_food_list, container, false);
             setupRecyclerView(rv);
            fetchData(); //Here i got calling error
//Error Description : Java.lang.NullPointerException: Attempt to invoke interface method 'retrofit2.Call com.test.myapp.Main.APIInterface.getProduct()' on a null object reference   

            return rv;

        }

        private void fetchData() {
            mAPIInterfacel.getProduct().enqueue(new Callback<ArrayList<LoadAbout>>() {
                @Override
                public void onResponse(Call<ArrayList<LoadAbout>> call, retrofit2.Response<ArrayList<LoadAbout>> response) {
                    mProductList.addAll(response.body());
                    mProductAdapter.notifyDataSetChanged();
                }

                @Override
                public void onFailure(Call<ArrayList<LoadAbout>> call, Throwable t) {
                    Log.d("Error G", "Test: ");
                }
            });
        }



        private void setupRecyclerView(RecyclerView recyclerView) {

            recyclerView.setLayoutManager(new LinearLayoutManager(recyclerView.getContext()));
            //recyclerView.setAdapter(new SimpleStringRecyclerViewAdapter(getActivity(),
            //        getRandomSublist(Cheeses.sCheeseStrings, 5)));
            //mProductAdapter = new FoodlistAdapter(this.mProductList);
            //fetchData();
            recyclerView.setAdapter(new FoodlistAdapter(getActivity(), mProductList) );

        }

        private List<String> getRandomSublist(String[] array, int amount) {
    //        ArrayList<String> list = new ArrayList<>(amount);
    //        Random random = new Random();
    //        while (list.size() < amount) {
    //            //list.add(array[random.nextInt(array.length)]);
    //            list.add("1 to 5");
    //        }
            List<String> list = Arrays.asList( array );
            return list;
        }

        public static class SimpleStringRecyclerViewAdapter
                extends RecyclerView.Adapter<SimpleStringRecyclerViewAdapter.ViewHolder> {

            private final TypedValue mTypedValue = new TypedValue();
            private int mBackground;
            private List<String> mValues;

            public static class ViewHolder extends RecyclerView.ViewHolder {
                public String mBoundString;

                public final View mView;
                //public final ImageView mImageView;
                public final TextView mTextView;
                public final TextView mTextView2;

                public ViewHolder(View view) {
                    super(view);
                    mView = view;
                    //mImageView = view.findViewById(R.id.avatar);
                    mTextView = view.findViewById(android.R.id.text1);
                    mTextView2 = view.findViewById(android.R.id.text2);
                }

                @Override
                public String toString() {
                    return super.toString() + " '" + mTextView.getText();
                }
            }

            public SimpleStringRecyclerViewAdapter(Context context, List<String> items) {
                context.getTheme().resolveAttribute(R.attr.selectableItemBackground, mTypedValue, true);
                mBackground = mTypedValue.resourceId;
                mValues = items;
            }

            @Override
            public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
                View view = LayoutInflater.from(parent.getContext())
                        .inflate(R.layout.food_list_item, parent, false);
                view.setBackgroundResource(mBackground);
                return new ViewHolder(view);
            }

            @Override
            public void onBindViewHolder(@NonNull final ViewHolder holder, int position) {
                holder.mBoundString = mValues.get(position);
                holder.mTextView.setText(mValues.get(position));
                final int img_pos = position;
                holder.mView.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        Context context = v.getContext();
                        if (img_pos == 0) {

                        } else {


                        }

                    }
                });

                RequestOptions options = new RequestOptions();

            }

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

FoodlistAdapter.java

public class FoodlistAdapter extends RecyclerView.Adapter<FoodlistAdapter.MyViewHolder> {
    private Context mContext;
    private ArrayList<LoadAbout> mItemList;
    public FoodlistAdapter (Context con, ArrayList<LoadAbout> list) {

        this.mContext = con;
        this.mItemList = list;
    }

    @NonNull
    @Override
    public MyViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
        View itemView = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.fragment_food_list, viewGroup, false);
        //return null;
        return new MyViewHolder(itemView);
    }

    @Override
    public void onBindViewHolder(@NonNull MyViewHolder myViewHolder, int i) {
        LoadAbout item = mItemList.get(i);
        myViewHolder.mnameTxt.setText(item.getMessage());
    }

    @Override
    public int getItemCount() {
        //return 0;
        return mItemList.size();
    }

    public class MyViewHolder extends RecyclerView.ViewHolder {
        public TextView mnameTxt;
        public MyViewHolder(@NonNull View itemView) {
            super(itemView);
            mnameTxt = (TextView)itemView.findViewById(R.id.text1);
        }
    }
}

food_list_item.xml

    <?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:state_focused="false"
    android:gravity="center_vertical">

    <TextView
        android:id="@+id/name_text"
        android:paddingRight="@dimen/album_title_padding"
        android:paddingLeft="@dimen/album_title_padding"
        android:paddingTop="@dimen/album_title_padding"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="15sp"
        android:textAppearance="@style/TextAppearance.AppCompat.Title"/>

    <android.support.v7.widget.CardView
        style="@style/Widget.CardContent"
        android:focusable="false"
        android:focusableInTouchMode="false"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginBottom="@dimen/album_top"
        android:layout_marginTop="@dimen/album_title"
        android:layout_marginLeft="@dimen/album_title"
        android:layout_marginRight="@dimen/album_title" >
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:padding="@dimen/album_margin"
        android:orientation="vertical">

        <TextView
            android:id="@+id/text1"
            android:paddingRight="@dimen/album_title_padding"
            android:paddingLeft="@dimen/album_title_padding"
            android:paddingTop="@dimen/album_title_padding"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textSize="15sp"
            android:textAppearance="@style/TextAppearance.AppCompat.Title"/>

        <TextView
            android:id="@android:id/text2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:paddingRight="@dimen/album_title_padding"
            android:paddingLeft="@dimen/album_title_padding"
            android:paddingTop="@dimen/album_title_padding"
            android:paddingBottom="@dimen/album_title_padding"
            android:text="@string/cheese_ipsum" />

    </LinearLayout>

    </android.support.v7.widget.CardView>
</LinearLayout>

APIInterface.java

import java.util.ArrayList;

import retrofit2.Call;
import retrofit2.http.GET;
import retrofit2.http.POST;

public interface APIInterface {
    @GET("about.php")
    Call<ArrayList<LoadAbout>> getProduct();
}

APIClient.java

import retrofit2.Retrofit;
import retrofit2.converter.gson.GsonConverterFactory;

public class APIClient {
    private static Retrofit retrofit = null;
    public static Retrofit getClient(){
        retrofit = new Retrofit.Builder()
                .baseUrl("http://app.themaxtech.com/api/test/")
        .addConverterFactory(GsonConverterFactory.create())
        .build();
        return retrofit;
    }

LoadAbout.java

import java.util.List;
import com.google.gson.annotations.Expose;
import com.google.gson.annotations.SerializedName;

public class LoadAbout {

    @SerializedName("success")
    @Expose
    private Integer success;
    @SerializedName("message")
    @Expose
    private String message;
    @SerializedName("poststr")
    @Expose
    private List<Poststr> poststr = null;

    public Integer getSuccess() {
        return success;
    }

    public void setSuccess(Integer success) {
        this.success = success;
    }

    public String getMessage() {
        return message;
    }

    public void setMessage(String message) {
        this.message = message;
    }

    public List<Poststr> getPoststr() {
        return poststr;
    }

    public void setPoststr(List<Poststr> poststr) {
        this.poststr = poststr;
    }
}

Poststr.java

import com.google.gson.annotations.Expose;
import com.google.gson.annotations.SerializedName;

public class Poststr {

    @SerializedName("dat")
    @Expose
    private String dat;
    @SerializedName("des")
    @Expose
    private String des;

    public String getDat() {
        return dat;
    }

    public void setDat(String dat) {
        this.dat = dat;
    }

    public String getDes() {
        return des;
    }

    public void setDes(String des) {
        this.des = des;
    }

}