CODEWITHSUNDEEP
imagexamarin.androiddownloadsave
BlokerX
BlokerX

Reputation: 13

Download and open picture from url/http [Android Xamarin App]

Hello, would any of you send a working code to download a photo from a given http address on android Xamarin c #? First, I need to create a new folder for my application files. My goal is to download the file from the internet to my Android folder (saving this file with its original name is best). The next step is to display the image from that folder in "ImageView". It is also important that there are permissions in android and I do not fully understand it. Could any of you send it to me or help me understand it and explain the topic?

*Actually i have this code:

string address = "https://i.sstatic.net/X3V3w.png";
using (WebClient webClient = new WebClient())
{
     webClient.DownloadFileCompleted += WebClient_DownloadFileCompleted;
     webClient.DownloadFile(address, Path.Combine(pathDire, "MyNewImage1.png"));
     //System.Net.WebException: 'An exception occurred during a WebClient request.'
}

Upvotes: 1

Views: 718

Answers (1)

Cherry Bu - MSFT
Cherry Bu - MSFT

Reputation: 10356

Loading image from url and display in imageview.

 private void Btn1_Click(object sender, System.EventArgs e)
    {
        var imageBitmap = GetImageBitmapFromUrl("http://xamarin.com/resources/design/home/devices.png");
        imagen.SetImageBitmap(imageBitmap);
    }

    private Bitmap GetImageBitmapFromUrl(string url)
    {
        Bitmap imageBitmap = null;

        using (var webClient = new WebClient())
        {
            var imageBytes = webClient.DownloadData(url);
            if (imageBytes != null && imageBytes.Length > 0)
            {

                SavePicture("ImageName.jpg", imageBytes, "imagesFolder");
                imageBitmap = BitmapFactory.DecodeByteArray(imageBytes, 0, imageBytes.Length);
            }
        }

        return imageBitmap;
    }

download image and save it in local storage.

 private void SavePicture(string name, byte[] data, string location = "temp")
    {
        
        var documentsPath = System.Environment.GetFolderPath(System.Environment.SpecialFolder.Personal);
        documentsPath = System.IO.Path.Combine(documentsPath, "Orders", location);
        Directory.CreateDirectory(documentsPath);

        string filePath = System.IO.Path.Combine(documentsPath, name);      
        using (FileStream fs = new FileStream(filePath, FileMode.OpenOrCreate))
        {             
            int length = data.Length;
            fs.Write(data, 0, length);
        }
    }

you need to add permission WRITE_EXTERNAL_STORAGE and READ_EXTERNAL_STORAGE in AndroidMainfeast.xml, then you also need to Runtime Permission Checks in Android 6.0.

  private void checkpermission()
    {
        if (ContextCompat.CheckSelfPermission(this, Manifest.Permission.WriteExternalStorage) == (int)Permission.Granted)
        {
            // We have permission, go ahead and use the writeexternalstorage.
        }
        else
        {
            // writeexternalstorage permission is not granted. If necessary display rationale & request.
        }
        if (ContextCompat.CheckSelfPermission(this, Manifest.Permission.ReadExternalStorage) == (int)Permission.Granted)
        {
            // We have permission, go ahead and use the ReadExternalStorage.
        }
        else
        {
            // ReadExternalStorage permission is not granted. If necessary display rationale & request.
        }
    }

Upvotes: 1

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