package com.example.myapplication;

import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import androidx.annotation.Nullable;
import androidx.fragment.app.Fragment;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import com.alibaba.fastjson.JSONObject;
import com.example.myapplication.adapter.CellListAdapter;
import com.example.myapplication.entity.Article;
import com.example.myapplication.entity.FirstPageVO;
import okhttp3.*;
import org.jetbrains.annotations.NotNull;

import java.io.IOException;
import java.util.ArrayList;


/**
 * A simple {@link Fragment} subclass.
 * Use the {@link HomeFragment#newInstance} factory method to
 * create an instance of this fragment.
 */
public class HomeFragment extends Fragment {

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


    // TODO: Rename and change types and number of parameters
    public static HomeFragment newInstance(String param1, String param2) {
        HomeFragment fragment = new HomeFragment();
        Bundle args = new Bundle();

        fragment.setArguments(args);
        return fragment;
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

    }

    static ArrayList<Article> data = new ArrayList<>();
    // ListView listView;
    static RecyclerView recyclerView;
    private static int total = 100;
    private static final int size = 5;
    private static int pages = 10;
    private static int page = 1;
    CellListAdapter adapter = null;


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {


        return inflater.inflate(R.layout.home_fragment, container, false);

        // ViewGroup pa = (ViewGroup) rootView.getParent();
        // if(pa!=null) {
        //     pa.removeView(rootView);
        // }


    }

    @Override
    public void onActivityCreated(@Nullable Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);

        recyclerView = requireActivity().findViewById(R.id.recycler_view);

        recyclerView.setLayoutManager(new LinearLayoutManager(requireActivity()));


        adapter = new CellListAdapter(requireActivity(), data);

        recyclerView.setAdapter(adapter);

        recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {

            protected boolean isSlideToBottom(RecyclerView recyclerView) {
                if (recyclerView == null) return false;
                if (recyclerView.computeVerticalScrollExtent() + recyclerView.computeVerticalScrollOffset() >= recyclerView.computeVerticalScrollRange()) {
                    return true;
                }
                return false;
            }
            @Override
            public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
                super.onScrollStateChanged(recyclerView, newState);
            }

            @Override
            public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
                super.onScrolled(recyclerView, dx, dy);
                if(isSlideToBottom(recyclerView)) {
                    getFirstPageData();
                }

            }
        });
        // Article article = new Article();
        // article.setTitle("6666");
        // data.add(article);

        // adapter = new CellListAdapter(getActivity(), data);
        // listView.setAdapter(adapter);
        getFirstPageData();
    }

    public void getFirstPageData() {
        //如果超过页数，就不继续请求数据了
        if (data.size() >= total) {
            return;
        }

        OkHttpClient client = new OkHttpClient();
        Request request = new Request.Builder()
                .url("http://www.itshare.club/api/blogList?page=" + page + "&size=" + size)
                .get().build();
        Call call = client.newCall(request);
        page++;
        call.enqueue(new Callback() {
            @Override
            public void onFailure(@NotNull Call call, @NotNull IOException e) {

            }

            @Override
            public void onResponse(@NotNull Call call, @NotNull Response response) throws IOException {
                // System.out.println(("res"+ response.body().string() ));
                FirstPageVO json = JSONObject.parseObject(response.body().string(), FirstPageVO.class);

                FirstPageVO.Data d = json.getData();
                total = d.getTotal();
                pages = d.getPages();
                data.addAll(d.getContentList());
                getActivity().runOnUiThread(() -> {
                    Log.i("request .", "success" + page);
                    // adapter.setList(data);
                    adapter.notifyDataSetChanged();
                });
                ;
            }
        });
    }


    // @Override
    // public void switchContent(Fragment from, Fragment to) {
    //     if (mContent != to) {
    //         mContent = to;
    //         FragmentTransaction transaction = mFragmentMan.beginTransaction().setCustomAnimations(
    //                 android.R.anim.fade_in, R.anim.slide_from_right);
    //         if (!to.isAdded()) {    // 先判断是否被add过
    //             transaction.hide(from).add(R.id.content_frame, to).commit(); // 隐藏当前的fragment，add下一个到Activity中
    //         } else {
    //             transaction.hide(from).show(to).commit(); // 隐藏当前的fragment，显示下一个
    //         }
    //     }
    // }


    // public boolean isFragmentViewInit = false;
    // private View lastView;
    // @Override
    // public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
    //     if (!isFragmentViewInit) {
    //         super.onViewCreated(view, savedInstanceState);
    //
    //         isFragmentViewInit = true;
    //     }
    //
    // }


    // @Override
    // public View onCreateView(LayoutInflater inflater, ViewGroup container,
    //                          Bundle savedInstanceState) {
    //     // Log.i(TAG, "onCreateView");
    //
    //     if (rootView == null) {
    //         rootView = inflater.inflate(R.layout.home_fragment, null);
    //     }
    //     // 缓存的rootView需要判断是否已经被加过parent，如果有parent需要从parent删除，要不然会发生这个rootview已经有parent的错误。
    //     ViewGroup parent = (ViewGroup) rootView.getParent();
    //     if (parent != null) {
    //         parent.removeView(rootView);
    //     }
    //     return rootView;
    // }


}

package com.example.myapplication.adapter;

import android.content.Context;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;
import com.bumptech.glide.Glide;
import com.example.myapplication.R;
import com.example.myapplication.entity.Article;

import java.util.List;

/**
 * @Author lyr
 * @create 2020/10/9 12:44
 */

public class CellListAdapter /*extends BaseAdapter */ extends RecyclerView.Adapter<CellListAdapter.ViewHolder>{
    List<Article> list;





    LayoutInflater inflater;

    public CellListAdapter(Context context, List<Article> list) {
        this.list = list;
        inflater = LayoutInflater.from(context);
    }


    @NonNull
    @Override
    public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        inflater = LayoutInflater.from(parent.getContext());
        View itemView  = inflater.inflate(R.layout.cell_item, parent,false);
        ViewHolder viewHolder = new ViewHolder(itemView);
        itemView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Log.i("hello","world");
            }
        });
        return viewHolder;
    }


    @Override
    public void onBindViewHolder(@NonNull ViewHolder holder, int position) {
        Article article = list.get(position);
        holder.title.setText(article.getTitle());
        holder.description.setText(article.getDescription());
        Glide.with(holder.imageView.getContext())
                .load(article.getFirstPicture())
                .into(holder.imageView);
    }


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

    // ViewHolder viewHolder;

    class ViewHolder extends RecyclerView.ViewHolder{
        TextView title;
        ImageView imageView;
        TextView description;

        public ViewHolder(@NonNull View itemView) {
            super(itemView);
            title = itemView.findViewById(R.id.a_title);
            imageView = itemView.findViewById(R.id.a_imageView);
            description = itemView.findViewById(R.id.a_description);
        }
    }


    //
    // // @Override
    // public View getView(int i, View convertView, ViewGroup viewGroup) {
    //     ViewHolder viewHolder;
    //     // 当view为空时才加载布局，否则，直接修改内容
    //     if (convertView == null) {
    //
    //         // 通过inflate的方法加载布局，context需要在使用这个Adapter的Activity中传入。
    //         convertView = inflater.inflate(R.layout.cell_item, null);
    //         viewHolder = new ViewHolder();
    //         viewHolder.title = convertView.findViewById(R.id.a_title);
    //         viewHolder.imageView = convertView.findViewById(R.id.a_imageView);
    //         viewHolder.description = convertView.findViewById(R.id.a_description);
    //         //缓存 viewHolder 对象
    //         convertView.setTag(viewHolder);
    //
    //         // 用setTag方法将处理好的viewHolder放入view中
    //     }else {
    //         viewHolder = (ViewHolder)convertView.getTag();
    //     }
    //     Article article = this.list.get(i);
    //
    //     // imageView.setImageURI(Uri.parse("http://img.itshare.club/20200915222524.png"));
    //     Glide.with(viewHolder.imageView.getContext())
    //             .load(article.getFirstPicture())
    //             .into(viewHolder.imageView);
    //     viewHolder.title.setText(article.getTitle());
    //     viewHolder.description.setText(article.getDescription());
    //
    //     // 从viewHolder中取出对应的对象，然后赋值给他们
    //     // viewHolder.title.setText(list.get(i).getTitle());
    //
    //     // 将这个处理好的view返回
    //     return convertView;
    // }


}

监听点击事件

  @NonNull
    @Override
    public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        inflater = LayoutInflater.from(parent.getContext());
        View itemView  = inflater.inflate(R.layout.cell_item, parent,false);
        ViewHolder viewHolder = new ViewHolder(itemView);
        itemView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Log.i("hello","world");
            }
        });
        return viewHolder;
    }