MainActivityFragment.java

        HttpURLConnection urlConnection = null;
        BufferedReader reader = null;

        String forecastJsonStr = null;

        try {
            String baseUrl = "http://api.openweathermap.org/data/2.5/forecast/daily?q=94043&mode=json&units=metric&cnt=7";
            String apiKey = "&APPID=" + BuildConfig.OPEN_WEATHER_MAP_API_KEY;
            URL url = new URL(baseUrl.concat(apiKey));

            urlConnection = (HttpURLConnection) url.openConnection();
            urlConnection.setRequestMethod("GET");
            urlConnection.connect();

            InputStream inputStream = urlConnection.getInputStream();
            StringBuffer buffer = new StringBuffer();
            if (inputStream == null) {
                return null;
            }
            reader = new BufferedReader(new InputStreamReader(inputStream));

            String line;
            while ((line = reader.readLine()) != null) {
                buffer.append(line + "\n");
            }

            if (buffer.length() == 0) {
                return null;
            }
            forecastJsonStr = buffer.toString();
        } catch (IOException e) {
            Log.e("MainActivityFragment", "Error ", e);
            return null;
        } finally{
            if (urlConnection != null) {
                urlConnection.disconnect();
            }
            if (reader != null) {
                try {
                    reader.close();
                } catch (final IOException e) {
                    Log.e("MainActivityFragment", "Error closing stream", e);
                }
            }
        }