使用HttpURLConnection访问网络接口，展示列表数据

xml文件

main布局

<com.handmark.pulltorefresh.library.PullToRefreshListView    android:id="@+id/pull_refresh_list"    android:layout_width="match_parent"    android:layout_height="match_parent"    ></com.handmark.pulltorefresh.library.PullToRefreshListView>

MainActivity类

public class MainActivity extends AppCompatActivity {    private ListView lv;    private List<Jbean.NewslistBean> newslist;    private Shipei sheipei;    private PullToRefreshListView pi;    private Handler handler = new Handler();    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        pi = (PullToRefreshListView) findViewById(R.id.pull_refresh_list);        shuju();    }    public void shuju(){        new Thread(){            @Override            public void run() {                super.run();                final String getjson = Qingqiu.getjson();                runOnUiThread(new Runnable() {                    @Override                    public void run() {                        Gson gson = new Gson();                        Jbean jBean = gson.fromJson(getjson, Jbean.class);                        newslist = jBean.newslist;                        sheipei = new Shipei();                        pi.setAdapter(sheipei);                        pi.onRefreshComplete();//设置让刷新关闭                    }                });            }        }.start();    }    class Shipei extends BaseAdapter {        @Override        public int getCount() {            return newslist.size();        }        @Override        public Object getItem(int i) {            return newslist.get(i);        }        @Override        public long getItemId(int i) {            return i;        }        @Override        public View getView(int i, View view, ViewGroup viewGroup) {            ViewHolder hd = null;            //优化            if (view==null){                hd = new ViewHolder();                view = View.inflate(MainActivity.this,R.layout.item,null);                hd.iv = view.findViewById(R.id.iv);                hd.tv1 = view.findViewById(R.id.tv1);                hd.tv2 = view.findViewById(R.id.tv2);                view.setTag(hd);            }else {                hd = (ViewHolder) view.getTag();            }            hd.tv1.setText(newslist.get(i).title);            hd.tv2.setText(newslist.get(i).ctime);            ImageLoader.getInstance().displayImage(newslist.get(i).picUrl,hd.iv);            return view;        }    }    class ViewHolder{        ImageView iv;        TextView tv1,tv2;    }}

 Img类

ImageLoaderConfiguration configuration = new ImageLoaderConfiguration.Builder(this).build();ImageLoader.getInstance().init(configuration);

Qingqiu类

public class Qingqiu {    static String path = "https://api.tianapi.com/wxnew/?key=8d6e3228d25298f13af4fc40ce6c9679&num=10&page=1";    private static ByteArrayOutputStream outputStream;    public static String getjson(){        try {            URL url = new URL(path);            HttpURLConnection connection = (HttpURLConnection) url.openConnection();            connection.setReadTimeout(5000);            int  responseCode = connection.getResponseCode();            outputStream = new ByteArrayOutputStream();            if (responseCode==200){                InputStream inputStream = connection.getInputStream();                byte[] b = new byte[1024];                int len = -1;                while ((len=inputStream.read(b)) != -1){                    outputStream.write(b,0,len);                }                return outputStream.toString();            }        } catch (Exception e) {            e.printStackTrace();        }        return outputStream.toString();    }}