CarregaDadosMethod

 public String carregarDadosDeTemperatura(String stringUrl)
    {
        HttpURLConnection conexao = null;
        BufferedReader reader=null;
        String jsonTemperatura = null;
        InputStream inputStream=null;
        URL url = null;

        try {
            url  = new URL(stringUrl);
            conexao = (HttpURLConnection) url.openConnection();
            conexao.setRequestMethod("GET");
            conexao.setReadTimeout(10000);

            inputStream = conexao.getInputStream();
            StringBuffer buffer = new StringBuffer();
            if (inputStream == null) {
                // Nothing to do.
                jsonTemperatura = null;
            }
            reader = new BufferedReader(new InputStreamReader(inputStream));

            String line;
            while ((line = reader.readLine()) != null) {
                // Since it's JSON, adding a newline isn't necessary (it won't affect parsing)
                // But it does make debugging a *lot* easier if you print out the completed
                // buffer for debugging.
                buffer.append(line + "\n");
            }

            if (buffer.length() == 0) {
                // Stream was empty.  No point in parsing.
                jsonTemperatura = null;
            }

            jsonTemperatura = buffer.toString();



        } catch (MalformedURLException e) {
            e.printStackTrace();
        }
        catch(IOException e)
        {

        }
        finally {

            if(inputStream!=null)
            {
                try {
                    inputStream.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }

            }
        }

        return jsonTemperatura;
    }