Handler获取网络数据

public class MainActivity extends AppCompatActivity {
private ListView listview;
@SuppressLint("HandlerLeak")
private Handler handler = new Handler() {
    @Override
    public void handleMessage(Message msg) {
        super.handleMessage(msg);
        String obj = (String) msg.obj;

        Log.i("abc", "handlerMessage:" + obj);

        Gson gson = new Gson();

        JsonBean fromJson = gson.fromJson(obj, JsonBean.class);

        ArrayList<Data> data = fromJson.getData();

        MyAdapter adapter = new MyAdapter(MainActivity.this, data);

        listview.setAdapter(adapter);


    }
};

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    listview = findViewById(R.id.listview);

    getHttp();

}

private void getHttp() {
    new Thread(new Runnable() {
        @Override
        public void run() {
            try {
                URL url = new URL("http://www.xieast.com/api/news/news.php?page=1");
                HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
                urlConnection.setRequestMethod("GET");
                urlConnection.setConnectTimeout(5000);
                urlConnection.setReadTimeout(5000);
                if (urlConnection.getResponseCode() == HttpURLConnection.HTTP_OK) {
                    InputStream stream = urlConnection.getInputStream();
                    BufferedReader reader = new BufferedReader(new InputStreamReader(stream));
                    StringBuilder builder = new StringBuilder();
                    String string = "";
                    while ((string = reader.readLine()) != null) {
                        builder.append(string);
                    }
                    Message message = new Message();
                    message.obj = builder.toString();
                    handler.sendMessage(message);
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }).start();
}}