PullToRefreshGridView上拉重新整理下拉載入

<!-- TODO: Update blank fragment layout -->
<com.handmark.pulltorefresh.library.PullToRefreshGridView
    android:id="@+id/gridView"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:numColumns="2"></com.handmark.pulltorefresh.library.PullToRefreshGridView>
 

import android.app.Fragment;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.GridView;

import com.google.gson.Gson;
import com.handmark.pulltorefresh.library.PullToRefreshBase;
import com.handmark.pulltorefresh.library.PullToRefreshGridView;

import java.util.ArrayList;

public class TwoFragment extends Fragment {

private int cc = 1;
private String path = "https://www.apiopen.top/meituApi?page=" + cc;
private PullToRefreshGridView grid;
private ArrayList<Bean.DataBean> list = new ArrayList<Bean.DataBean>();
private GridView mGridView;
private Bean bean;
private Adapteraa adapteraa;

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.fragment_two, container, false);
    grid = view.findViewById(R.id.gridView);
    grid.setMode(PullToRefreshBase.Mode.BOTH);
    mGridView = grid.getRefreshableView();
    sta(cc);
    grid.setOnRefreshListener(new PullToRefreshBase.OnRefreshListener2<GridView>() {
        @Override
        public void onPullDownToRefresh(PullToRefreshBase<GridView> refreshView) {
            sta(cc);
            new GetDataTask().execute();
        }

        @Override
        public void onPullUpToRefresh(PullToRefreshBase<GridView> refreshView) {
            cc++;
            sta(cc);
            new GetDataTask().execute();
        }
    });
    return view;
}

public void sta(int cc) {
    Gong gong = new Gong();
    gong.get(path + cc).getHome(new Gong.HttpGong() {
        @Override
        public void getName(String name) {
            Gson gson = new Gson();
            //list.clear();
            bean = gson.fromJson(name, Bean.class);
            list.addAll(bean.getData());
            adapteraa = new Adapteraa(getActivity(), list);
            mGridView.setAdapter(adapteraa);
        }
    });
}

private class GetDataTask extends AsyncTask<Void, Void, String[]> {

    @Override
    protected String[] doInBackground(Void... params) {
        try {
            Thread.sleep(2000);
        } catch (InterruptedException e) {
        }
        return null;
    }

    @Override
    protected void onPostExecute(String[] result) {
        list.addAll(bean.getData());
        adapteraa.notifyDataSetChanged();
        grid.onRefreshComplete();
        super.onPostExecute(result);
    }
}
 

}