Xamarin Android Download PDF/XLS/DOCX

Question

Helo2,
Im looking for solution to download files (ie: pdf, docx, xls,etc.) using content resolver like in example provided on below link (by @JarvanZhang ) but no luck.
https://learn.microsoft.com/en-us/answers/questions/531801/save-a-picture-from-camera-to-device-gallery-using.html
Is there any additional part to add?
Here's my code

Android.Content.Context context = MainActivity.Instance;
Android.Content.ContentResolver resolver = context.ContentResolver;
Android.Content.ContentValues contentValues = new Android.Content.ContentValues();
contentValues.Put(Android.Provider.MediaStore.IMediaColumns.DisplayName, Path.GetFileName(url));
contentValues.Put(Android.Provider.MediaStore.IMediaColumns.MimeType, "application/pdf, application/docx");
contentValues.Put(Android.Provider.MediaStore.IMediaColumns.RelativePath, "Download" + "/" + folder);
Android.Net.Uri fileUri = resolver.Insert(Android.Provider.MediaStore.Downloads.ExternalContentUri, contentValues);
var os = resolver.OpenOutputStream(fileUri);
var webClient = new WebClient();
byte[] byteFile = webClient.DownloadData(url);
MemoryStream stream = new MemoryStream(byteFile);
int length;
byte[] buffer = new byte[4096];
while ((length = stream.Read(buffer)) > 0)
{
os.Write(buffer, 0, length);
}
os.Flush();
os.Close();

Answer 1

Hello,​

Welcome to our Microsoft Q&A platform!

I created a basic demo to test the function with the following code, it works as expected. The only difference is MimeType, please set the type for the file separately. For example, set MimeType to application/pdf if you want to save a pdf file. You could use switch to detect the file type.

   if (Android.OS.Build.VERSION.SdkInt > BuildVersionCodes.Q)  
   {  
       ContentResolver resolver = context.ContentResolver;  
       ContentValues contentValues = new ContentValues();  
       contentValues.Put(MediaStore.MediaColumns.DisplayName, fileName);  
       contentValues.Put(MediaStore.MediaColumns.MimeType, "image/png");  
       contentValues.Put(MediaStore.MediaColumns.RelativePath, "Download/" + "test");  
       Android.Net.Uri imageUri = resolver.Insert(MediaStore.Downloads.ExternalContentUri, contentValues);  
       var os = resolver.OpenOutputStream(imageUri);  
       BitmapFactory.Options options = new BitmapFactory.Options();  
       options.InJustDecodeBounds = true;  
       var bitmap = BitmapFactory.DecodeStream(stream);  
       bitmap.Compress(Bitmap.CompressFormat.Png, 100, os);  
       os.Flush();  
       os.Close();  
   }  

Best Regards,

Jarvan Zhang

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