异步请求网络json

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package com.example.lxss;import android.os.AsyncTask;import android.os.Bundle;import android.support.v7.app.AppCompatActivity;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.Button;import android.widget.ListView;import android.widget.TextView;import com.google.gson.Gson;import java.io.ByteArrayOutputStream;import java.io.InputStream;import java.net.HttpURLConnection;import java.net.URL;public class MainActivity extends AppCompatActivity {private  Button button; private  Button button1; private Bean bean;    private  ListView lv;    private Mydapter ma;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        button = (Button) findViewById(R.id.button);        button1 = (Button) findViewById(R.id.button2);        lv = (ListView) findViewById(R.id.lv);        ma=new Mydapter();button.setOnClickListener(new View.OnClickListener() {    @Override    public void onClick(View view) {        new AsyncTask<String,String,String>()        {            @Override            protected String doInBackground(String... strings) {                return getData();            }            @Override            protected void onPostExecute(String str) {                Gson gson = new Gson();               bean = gson.fromJson(str, Bean.class);                lv.setAdapter(ma);                super.onPostExecute(str);            };        }.execute();    }});    }    class Mydapter extends BaseAdapter{        @Override        public int getCount() {            return bean.getNewslist().size();        }        @Override        public Object getItem(int i) {            return bean.getNewslist().get(i );        }        @Override        public long getItemId(int i) {            return i;        }        @Override        public View getView(int i, View view, ViewGroup viewGroup) {            ViewHoder vi;            if (view==null){                vi = new ViewHoder();                view = View.inflate(MainActivity.this, R.layout.list, null);                vi.textView3=(TextView) view.findViewById(R.id.textView3);                vi.textView4=(TextView) view.findViewById(R.id.textView4);                vi.textView5=(TextView) view.findViewById(R.id.textView5);                vi.textView6=(TextView) view.findViewById(R.id.textView6);                   vi.tvs=(TextView) view.findViewById(R.id.tvs);         view.setTag(vi);            }else {              vi = (ViewHoder) view.getTag();            }            vi.textView3.setText(bean.getNewslist().get(i).getCtime());            vi.textView4.setText(bean.getNewslist().get(i).getDescription());            vi.textView5.setText(bean.getNewslist().get(i).getPicUrl());            vi.textView6.setText(bean.getNewslist().get(i).getTitle());            vi.tvs.setText(bean.getNewslist().get(i).getUrl());            return view;        }        class ViewHoder{            public TextView tvs;            public TextView textView3;            public TextView textView4;            public TextView textView5;            public TextView textView6;        }    }    private String getData(){String str="";    try {        URL url = new URL("https://api.tianapi.com/wxnew/?key=8d6e3228d25298f13af4fc40ce6c9679&num=10");        HttpURLConnection conn = (HttpURLConnection) url.openConnection();        conn.setRequestMethod("GET");        int code = conn.getResponseCode();        if (code==200)        {            InputStream stream = conn.getInputStream();            ByteArrayOutputStream bos = new ByteArrayOutputStream();            int len=-1;            byte[] b = new byte[1024];            while ((len=stream.read(b))!=-1){                bos.write(b,0,len);            }            str = new String (bos.toByteArray(),"GBK");        }    } catch (Exception e) {        e.printStackTrace();    }    return str;}}
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