public void onClickShowWeather(View view) {
        String city = editTextCity.getText().toString().trim();
        Log.i("hoz_", "onClickShowWeather() ==> city = " + city);
        if (!city.isEmpty()) {
            DownloadWeatherTask task = new DownloadWeatherTask();
            String url = String.format(WEATHER_URL, city);
            Log.i("hoz_", "onClickShowWeather() ==> url = " + url);
            task.execute(url);
        }
        Log.i("hoz_", "onClickShowWeather() ==> The END");
    }

    private class DownloadWeatherTask extends AsyncTask<String, Void, String> {
        @Override
        protected String doInBackground(String... strings) {
            URL url = null;
            HttpURLConnection urlConnection = null;
            StringBuilder result = new StringBuilder();
            try {
                url = new URL(strings[0]);
                urlConnection = (HttpURLConnection) url.openConnection();
                InputStream inputStream = urlConnection.getInputStream();
                InputStreamReader inputStreamReader = new InputStreamReader(inputStream);
                BufferedReader reader = new BufferedReader(inputStreamReader);
                String line = reader.readLine();

                while (line != null) {
                    result.append(line);
                    line = reader.readLine();
                }
                Log.i("hoz_", "doInBackground() ==> result = " + result.toString());

                return result.toString();
            } catch (MalformedURLException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            } finally {
                if (urlConnection != null) {
                    urlConnection.disconnect();
                }
            }
            return null;
        }