Fragmentone

package com.example.work1.fragment;

import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.support.annotation.NonNull;
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.BaseAdapter;
import android.widget.ListView;
import android.widget.TextView;

import com.example.work1.R;

import com.example.work1.bean.Personbean;
import com.example.work1.bean.Workbean;
import com.google.gson.Gson;

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

public class Fragmentone extends Fragment {

public ListView listview;
public MyBase mybase;
public String urlString="http://api.expoon.com/AppNews/getNewsList/type/1/p/1";
public List<Personbean.DataBean> list=new ArrayList<Personbean.DataBean>();

public Handler handler=new Handler(){
    @Override
    public void handleMessage(Message msg) {
        super.handleMessage(msg);

        if (msg.what==1){
            String jj= (String) msg.obj;
            Gson gson=new Gson();
            Personbean fromJson=gson.fromJson(jj,Personbean.class);
            list=fromJson.getData();
            mybase.notifyDataSetChanged();


        }
    }
};
@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {

    View view=inflater.inflate(R.layout.fragmentone,container,false);
    listview=view.findViewById(R.id.listview);
    mybase=new MyBase();
    listview.setAdapter(mybase);

    return view;
}
class MyBase extends BaseAdapter {

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

    @Override
    public Object getItem(int position) {
        return null;
    }

    @Override
    public long getItemId(int position) {
        return 0;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder holder;
        if (convertView==null){
            holder=new ViewHolder();
            convertView=View.inflate(getActivity(), R.layout.mybase,null);
            holder.name1=(TextView) convertView.findViewById(R.id.basetext1);
            holder.name2=(TextView) convertView.findViewById(R.id.basetext2);
            holder.name3=(TextView) convertView.findViewById(R.id.basetext3);


            convertView.setTag(holder);

        }else {
            holder= (ViewHolder) convertView.getTag();
        }
        holder.name1.setText(list.get(position).getNews_id());
        holder.name2.setText(list.get(position).getNews_title());
        holder.name3.setText(list.get(position).getNews_summary());

        return convertView;
    }
    class ViewHolder{
        TextView name1;
        TextView name2;
        TextView name3;


    }
}

@Override
public void onActivityCreated(@Nullable Bundle savedInstanceState) {
    super.onActivityCreated(savedInstanceState);
    new Thread(
            new Runnable() {
                @Override
                public void run() {
                   String backjson= Workbean.getjson(urlString);
                   Message message=handler.obtainMessage();
                   message.what=1;
                   message.obj=backjson;
                   handler.sendMessage(message);
                }
            }
    ).start();
}

}