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 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();
    }
}