PullPullToRefreshListView的下拉刷新，上拉加载

ublic class MainActivity extends AppCompatActivity {    private PullToRefreshListView pull;    private String url = "https://api.tianapi.com/wxnew/?key=8d6e3228d25298f13af4fc40ce6c9679&num=10";    private ArrayList<Bean> list_bean = new ArrayList<>();    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        //找到控件        pull = (PullToRefreshListView) findViewById(R.id.pull);        initView();    }    Handler hand = new Handler()    {        @Override        public void handleMessage(Message msg) {            if(msg.what==1)            {                String count = (String) msg.obj;                try {                    JSONObject jsonObject = new JSONObject(count);                    JSONArray newslist = jsonObject.optJSONArray("newslist");                    for (int i = 0; i < newslist.length(); i++) {                        JSONObject jsonObject1 = newslist.optJSONObject(i);                        String description = jsonObject1.optString("description");                        String title = jsonObject1.optString("title");                        String picUrl = jsonObject1.optString("picUrl");                        list_bean.add(new Bean(description,title,picUrl));                    }                    //将下拉和上拉的条目隐藏                    pull.onRefreshComplete();                } catch (Exception e) {                    e.printStackTrace();                }                //设置适配器就不多说了，，很容易                pull.setAdapter(new Adapter(MainActivity.this,list_bean));                //让他支持上拉加载                pull.setMode(PullToRefreshBase.Mode.BOTH);                //设置刷新的方法                pull.setOnRefreshListener(new PullToRefreshBase.OnRefreshListener2<ListView>() {                    //下拉刷新                    @Override                    public void onPullDownToRefresh(PullToRefreshBase<ListView> refreshView) {                        //让存储的集合清空，重新请求数据添加进集合                        list_bean.clear();                        //在调用一次查找数据的方法                        initView();                    }                    //上拉加载                    @Override                    public void onPullUpToRefresh(PullToRefreshBase<ListView> refreshView) {                        //调用查找方法，自动拼接到集合中                        initView();                    }                });            }        }    };    //通过线程解析地址    public void initView()    {        new Thread()        {            @Override            public void run() {                try {                    URL ur = new URL(url);                    URLConnection urlConnection = ur.openConnection();                    InputStream inputStream = urlConnection.getInputStream();                    BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));                    String read = "";                    StringBuilder stringBuilder = new StringBuilder();                    while((read=bufferedReader.readLine())!=null)                    {                        stringBuilder.append(read);                    }                    Message message = new Message();                    message.obj = stringBuilder.toString();                    message.what = 1;                    hand.sendMessage(message);                } catch (Exception e) {                    e.printStackTrace();                }            }        }.start();    }}