RxNet.enableLog = true;

    String path = getExternalFilesDir(Environment.DIRECTORY_DOWNLOADS).getAbsolutePath() + File.separator + "weather.apk";
    RxNet.download(url, path, new DownloadCallback() {
        @Override
        public void onStart(Disposable d) {
            LogUtils.d("onStart");
        }

        @Override
        public void onProgress(long totalByte, long currentByte, int progress) {
            LogUtils.d("onProgress " + progress);
        }

        @Override
        public void onFinish(File file) {
            LogUtils.d("onFinish " + file.getAbsolutePath());
        }

        @Override
        public void onError(String msg) {
            LogUtils.d("onError " + msg);
        }