URIConnection

public class MainActivity extends AppCompatActivity {
    private String urlString = "http://api.expoon.com/AppNews/getNewsList/type/1/p/1";
    private String urlBitmap = "https://img-my.youkuaiyun.com/uploads/201407/26/1406383265_8550.jpg";
    private ImageView iv;
    private ListView lv;
    private List<String> list;
    private MyAdapter adapter;
    private List<News.DataBean> dataBeanList;
    private Handler handler = new Handler() {
        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
            if (msg.what == 1) {
                adapter = new MyAdapter(list, MainActivity.this);
                lv.setAdapter(adapter);
            } else if (msg.what == 2) {
                Bitmap bitmap = (Bitmap) msg.obj;
                iv.setImageBitmap(bitmap);
            }
        }
    };


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        iv = (ImageView) findViewById(R.id.imageView);
        lv = (ListView) findViewById(R.id.lv);

    }

    public void getNetData(View v) {
        Log.e("TAG", "我被点击了");
        new Thread() {

            @Override
            public void run() {
                super.run();
                String data = Tools.getData(urlString);
                Gson gson = new Gson();
                News news = gson.fromJson(data, News.class);
                dataBeanList = news.getData();
                list = new ArrayList<String>();
                for (int i = 0; i < dataBeanList.size(); i++) {
                    String summary = dataBeanList.get(i).getNews_summary();
                    list.add(summary);
                }
                Message message = Message.obtain();
                message.what = 1;
                handler.sendMessage(message);
            }
        }.start();
    }

    public void getNetBitmap(View v) {
        new Thread() {
            @Override
            public void run() {
                super.run();
                Bitmap bitmap = Tools.getBitmap(urlBitmap);
                Message message = Message.obtain();
                message.obj = bitmap;
                message.what = 2;
                handler.sendMessage(message);
            }
        }.start();
    }
}

public class Tools {
    public static String getData(String urlString){
        try {
            URL url = new URL(urlString);
            HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
            urlConnection.setRequestMethod("GET");
            urlConnection.setConnectTimeout(8000);

            InputStream inputStream = urlConnection.getInputStream();

            BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
            StringBuilder stringBuilder = new StringBuilder();
            String temp = "";
            while((temp = bufferedReader.readLine())!= null){
                stringBuilder.append(temp);
            }
            String data = stringBuilder.toString();
            return data;
        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }

        return "";
    }

    public static Bitmap getBitmap(String urlString){
        try {
            URL url = new URL(urlString);
            HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
            //获取联网状态码
            int code = urlConnection.getResponseCode();

            if(code == 200){
                InputStream inputStream = urlConnection.getInputStream();
                Bitmap bitmap = BitmapFactory.decodeStream(inputStream);
                return bitmap;
            }
        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return null;
    }
}