GridView Fragment

package com.bawei.eplus.fragment;


import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.GridView;

import com.bawei.eplus.R;
import com.bawei.eplus.adapter.FLAdapter;
import com.bawei.eplus.bean.FLBean;
import com.bawei.eplus.net.HttpUtils;
import com.google.gson.Gson;
import com.handmark.pulltorefresh.library.PullToRefreshBase;
import com.handmark.pulltorefresh.library.PullToRefreshGridView;

import java.util.ArrayList;
import java.util.List;

/**
 * 福利页面
 *
 * @author zhaoliang
 * @version 1.0
 * @create 2018/6/22
 */
public class TwoFragment extends Fragment {

    private PullToRefreshGridView gridView;
    private HttpUtils httpUtils;
    private String api = "http://gank.io/api/data/%E7%A6%8F%E5%88%A9/10/";
    private int page = 1;
    private List<FLBean.ResultsBean> resultsBeans = new ArrayList<>();
    private FLAdapter adapter;

    public TwoFragment() {
        // 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_two, container, false);
        gridView = view.findViewById(R.id.grid_view);

        return view;
    }

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

        // 设置支持上下刷新
        gridView.setMode(PullToRefreshBase.Mode.BOTH);
        // 设置刷新回调
        gridView.setOnRefreshListener(new PullToRefreshBase.OnRefreshListener2<GridView>() {
            @Override
            public void onPullDownToRefresh(PullToRefreshBase<GridView> refreshView) {
                page = 1;
                httpUtils.get(api + page);
            }

            @Override
            public void onPullUpToRefresh(PullToRefreshBase<GridView> refreshView) {
                page ++;
                httpUtils.get(api + page);
            }
        });

        loadData();
    }

    private void loadData() {
        httpUtils = HttpUtils.getInstance();
        httpUtils.setCallback(new HttpUtils.NetCallback() {
            @Override
            public void onSuccess(String s) {
                Gson gson = new Gson();
                FLBean flBean = gson.fromJson(s, FLBean.class);
                if (page == 1) {
                    adapter = new FLAdapter(getActivity(), resultsBeans);
                    gridView.setAdapter(adapter);
                    resultsBeans.clear();
                }
                resultsBeans.addAll(flBean.getResults());
                adapter.notifyDataSetChanged();
                gridView.onRefreshComplete();
            }

            @Override
            public void onError(String errorMsg) {

            }
        });
        httpUtils.get(api + page);
    }
}