PUM | Zad 2

using System;
using Android.App;
using Android.Widget;
using Android.OS;
using Android.Graphics;

using System.IO;
using System.Net;
using System.Threading.Tasks;

namespace Zad2PUM
{

    [Activity(Label = "Zad2PUM", MainLauncher = true,
        ConfigurationChanges = Android.Content.PM.ConfigChanges.Orientation)]
    public class MainActivity : Activity
    {
        int _counter = 0;
        string _imie, _nazwisko;
        WebClient webClient;
        Button downloadButton, clickButton;
        ImageView imageview;
        ProgressBar downloadProgress;
        private EditText Imie, Nazwisko, CounterText, urlText;
        private string urlGlobal;


        protected override void OnCreate(Bundle bundle)
        {
            base.OnCreate(bundle);

            // Set our view from the "main" layout resource
            SetContentView(Resource.Layout.Main);

            if (bundle != null)
            {
                _imie = bundle.GetString("imie", "");
                _nazwisko = bundle.GetString("nazwisko", "");
                _counter = bundle.GetInt("counter", 0);
            }

            CounterText = FindViewById<EditText>(Resource.Id.CounterText);
            Imie = FindViewById<EditText>(Resource.Id.EditName);
            Nazwisko = FindViewById<EditText>(Resource.Id.EditSecondName);
            urlText = FindViewById<EditText>(Resource.Id.ImageAddress);

            this.downloadButton = FindViewById<Button>(Resource.Id.ButtonDowload);
            this.clickButton = FindViewById<Button>(Resource.Id.CounterButton);
            this.imageview = FindViewById<ImageView>(Resource.Id.ImageView);
            this.downloadProgress = FindViewById<ProgressBar>(Resource.Id.ProgressBar);


            CounterText.Text = _counter.ToString();
            urlText.Text = "https://upload.wikimedia.org/wikipedia/commons/thumb/b/ba/Reh11ibb.jpg/240px-Reh11ibb.jpg";
            urlGlobal = urlText.Text;

            downloadButton.Click += downloadAsync;

            clickButton.Click += (object sender, EventArgs e) =>
            {
                _counter++;
                CounterText.Text = _counter.ToString();
            };
        }

        async void downloadAsync(object sender, System.EventArgs evarg)
        {
            webClient = new WebClient();
            var url = new Uri(urlGlobal);
            byte[] bytes = null;

            webClient.DownloadProgressChanged += HandleDownloadProgressChanged;

            this.downloadButton.Text = "Stop";
            this.downloadButton.Click -= downloadAsync;
            this.downloadButton.Click += cancelDownload;
            try
            {
                bytes = await webClient.DownloadDataTaskAsync(url);
            }
            catch (TaskCanceledException)
            {
                Toast.MakeText(this, "Przerwano pobieranie", ToastLength.Long).Show();
                return;
            }
            catch (Exception e)
            {
                Console.WriteLine(e.ToString());

                renewButton();
                return;
            }
            string documentsPath = System.Environment.GetFolderPath(System.Environment.SpecialFolder.Personal);
            string localFilename = "sarna.jpg";
            string localPath = System.IO.Path.Combine(documentsPath, localFilename);

            FileStream fs = new FileStream(localPath, FileMode.OpenOrCreate);
            await fs.WriteAsync(bytes, 0, bytes.Length);

            fs.Close();

            BitmapFactory.Options options = new BitmapFactory.Options();
            options.InJustDecodeBounds = true;
            await BitmapFactory.DecodeFileAsync(localPath, options);

            options.InSampleSize = options.OutWidth > options.OutHeight ? options.OutHeight / imageview.Height : options.OutWidth / imageview.Width;
            options.InJustDecodeBounds = false;

            Bitmap bitmap = await BitmapFactory.DecodeFileAsync(localPath, options);

            Toast.MakeText(this, "Pobrano!", ToastLength.Long).Show();

            imageview.SetImageBitmap(bitmap);

            renewButton();
        }

        void HandleDownloadProgressChanged(object sender, DownloadProgressChangedEventArgs e)
        {
            this.downloadProgress.Progress = e.ProgressPercentage;
        }

        void cancelDownload(object sender, System.EventArgs eeaa)
        {
            Toast.MakeText(this, "Przerwano pobieranie", ToastLength.Long).Show();
            if (webClient != null)
                webClient.CancelAsync();

            webClient.DownloadProgressChanged -= HandleDownloadProgressChanged;

            renewButton();
        }

        protected override void OnSaveInstanceState(Bundle outState)
        {
            outState.PutInt("counter", _counter);
            outState.PutString("imie", _imie);
            outState.PutString("nazwisko", _nazwisko);
            base.OnSaveInstanceState(outState);

        }

        protected override void OnRestoreInstanceState(Bundle savedState)
        {
            base.OnRestoreInstanceState(savedState);
            _counter = savedState.GetInt("counter");
            _imie = savedState.GetString("imie");
            _nazwisko = savedState.GetString("nazwisko");
        }

        private async Task loadMyImage()
        {
            string documentsPath = System.Environment.GetFolderPath(System.Environment.SpecialFolder.Personal);
            string localFilename = "sarna.jpg";
            string localPath = System.IO.Path.Combine(documentsPath, localFilename);

            BitmapFactory.Options options = new BitmapFactory.Options();
            options.InJustDecodeBounds = true;
            await BitmapFactory.DecodeFileAsync(localPath, options);

            options.InSampleSize = options.OutWidth > options.OutHeight ? options.OutHeight / imageview.Height : options.OutWidth / imageview.Width;
            options.InJustDecodeBounds = false;

            Bitmap bitmap = await BitmapFactory.DecodeFileAsync(localPath, options);
            imageview.SetImageBitmap(bitmap);
        }
        private void renewButton()
        {
            this.downloadButton.Click -= cancelDownload;
            this.downloadButton.Click += downloadAsync;
            this.downloadButton.Text = "Download image";
            this.downloadProgress.Progress = 0;
        }
    }
}