无法启动活动ComponentInfo {com.testes / com.testes.View_data}：android.os.NetworkOnMainThreadException

Question

我的代码没有错误，但是当我运行android应用程序时，logcats显示：

java.lang.RuntimeException: Unable to start activity 
ComponentInfo{com.testes/com.testes.MainActivity}: java.lang.RuntimeException: Unable to  
start activity ComponentInfo{com.testes/com.testes.View_data}:       
android.os.NetworkOnMainThreadException 

View_data.java：

      public class View_data extends ListActivity {
    private ArrayList<HashMap<String, String>> daftar_sektor = new
        ArrayList<HashMap<String, String>>();
        @Override
        public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.view);
        this.getDataMHS(); //memanggil method getDataMHS (ada di bawah)
        }
        public void getDataMHS(){
            final String url = "http://10.0.2.2/android/check_sektor.php"; 
            Map<String, String> params= new HashMap<String, String>();
            HttpRequestApi http = new HttpRequestApi(url, params,
                    HttpRequestApi.Method.GET);
                    String response = http.sendRequest();
                    try {
                        JSONArray jsarray= new JSONArray(response);
                        for (int i=0;i<jsarray.length();i++){
                        JSONObject jso = (JSONObject) jsarray.get(i);
                        HashMap<String, String> mapMHS = new HashMap<String,
                        String>();
                        HashMap<String, String> map = null;
                        //setiap nilai NIM dan NAMA dimasukkan kelam mapMHS
                        map.put("nama_sektor", jso.getString("nama_sektor"));

                        daftar_sektor.add(map);
                        }
                        } catch (JSONException e) {
                        e.printStackTrace();
                        }
                    ListAdapter adapter = new SimpleAdapter(this, daftar_sektor,
                            R.layout.list_view,
                            new String[] { "nama_sektor" }, new int[] {
                            R.id.txtLstnama_sektor});
                            setListAdapter(adapter);


        }
                 }