Bitcoin Price Watcher on the SSaurel's Blog

App1.java

private void launchTimer() {
 timer = new Timer();
 timer.schedule(new TimerTask() {
   @Override
   public void run() {
     loadBitcoinPrice(new Callback() {
       @Override
       public void onResponse(Call call, Response response) throws IOException {
         String str = response.body().string();
         parseBitcoinPrice(str);
       }

       @Override
       public void onFailure(Call call, IOException ioe) { }
    });
   }
  }, 0, PERIOD);
}

private void cancelTimer() {
 if (timer != null) {
  timer.cancel();
 }
}

private void loadBitcoinPrice(Callback callback) {
 Request request = new Request.Builder().url(BITCOIN_PRICE_ENDPOINT).build();
 client.newCall(request).enqueue(callback);
}