@Override
    protected String doInBackground(Context... contexts) {
        // get the string from params, which is an array
        Context context = contexts[0];
        System.out.println("Got context: " + context.toString());

        // Do something that takes a long time, for example:
        OkHttpClient client = new OkHttpClient();
      /*  if (BuildConfig.DEBUG) {
            client.interceptors().add(new LoggingInterceptor());
        } */

        System.out.println("Created new OkHttpClient");

        try {
            InputStream inputStream = context.getResources().openRawResource(R.raw.keys);
            String jsonString = new Scanner(inputStream).useDelimiter("\\A").next();
            JSONObject object = (JSONObject) new JSONTokener(jsonString).nextValue();
            String CLIENT_ID = object.optString("client_id");
            String REDIRECT_URI = object.optString("redirect_uri");
            String CLIENT_SECRET = object.optString("client_secret");
            String AUTHORIZATION_CODE = object.optString("authorization_code");
            String GRANT_TYPE = object.optString("grant_type");
            String TARGET_URL = object.optString("token_target_url");
            System.out.println("Got everything from keys.json");

            RequestBody bodyBuilder = new FormBody.Builder()
                    .addEncoded("client_secret", CLIENT_SECRET)
                    .addEncoded("client_id", CLIENT_ID)
                    .add("code", AUTHORIZATION_CODE)
                    .add("grant_type", GRANT_TYPE)
                    .add("redirect_uri", REDIRECT_URI)
                    .build();
            System.out.println("Built body: " + bodyBuilder.toString());

     //       String mediaTypeString = "application/x-www-form-urlencoded";
       //     MediaType mediaType = MediaType.parse(mediaTypeString);
         //   RequestBody body = RequestBody.create(mediaType, bodyBuilder.toString());

            Request request = new Request.Builder()
                    .url(TARGET_URL)
                    .post(bodyBuilder)
        //            .addHeader("content-type", mediaTypeString)
                    .addHeader("cache-control", "no-cache")
                    .build();

            try {
                System.out.println("Starting request.");
                Response response = client.newCall(request).execute();
                String targetUrl = request.url().toString() + bodyToString(request);
                System.out.println("request: " + targetUrl);
                String responseBodyString = response.body().string();
                System.out.println("response: " + responseBodyString);
                return responseBodyString;
            } catch (IOException ex) {
                System.out.println("Oof. IOException - take a look! " + ex);
            }

            return "Error in getting access token.";
        } catch (JSONException e) {
            e.printStackTrace();
        }

        return "Error in getting keys.json";

    }