private void DownloadButtonOnClick(object sender, EventArgs eventArgs)
{
Toast.MakeText(this, "File downloading started", ToastLength.Short).Show();
if (authSwitch.Checked) downloadViewModel.SetAuthData(loginEditText.Text, passwordEditText.Text);
downloadViewModel.StartDownloadAsync(urlEditText.Text).ContinueWith(task => { OnFileDownloaded(); });
}