okHTTP

 protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        setTitle("展覽通");
        myUrlSpinner = (Spinner) findViewById(R.id.spinner);
        setUrl = (Button) findViewById(R.id.button);
        responseTxt = (TextView) findViewById(R.id.textView);

        setUrl.setOnClickListener(listener);
        myUrlSpinner.setSelection(0, true);
        myUrlSpinner.setOnItemSelectedListener(itemListener);

        Thread thread = new Thread(requestThread);
        thread.start();
    }

    private Runnable requestThread = new Runnable() {
        @Override
        public void run() {
            requestWeb(url);
            runOnUiThread(
                    new Runnable() {
                        @Override
                        public void run() {
                            String setTxt = "";
                            if(result == "")
                                setTxt = "IOExcepftion happen on requestWeb";
                            else
                                setTxt = result;
                            responseTxt.setText(setTxt);
                        }
                    }
            );
        }
    };

    private void requestWeb(String url) {
        Request request = new Request.Builder().url(url).build();
        Response response = null;
        OkHttpClient okClient = new OkHttpClient();
        try {
            response = okClient.newCall(request).execute();
            result = response.body().string();
        } catch (IOException e) {
            result = "";
            e.printStackTrace();
        }
    }