Xamarin android image URI to Byte array

Question

i'm simply trying to upload image to server.

when i choose image from , i get URI to that image. the question is how can i convert this URI to byte[] byte array?

no more no less. thats my question

this is what ive been trying.

i tried to rewrite this https://colinyeoh.wordpress.com/2012/05/18/android-convert-image-uri-to-byte-array/ to C#

    public byte[] convertImageToByte(Android.Net.Uri uri)
    {
        byte[] data = null;
        try
        {

            ContentResolver cr = this.ContentResolver;
            var inputStream = cr.OpenInputStream(uri);
            Bitmap bitmap = BitmapFactory.DecodeStream(inputStream);
            var baos = new ByteArrayOutputStream();
            bitmap.Compress(Bitmap.CompressFormat.Jpeg, 100, baos);
            data = baos.ToByteArray();
        }
        catch (FileNotFoundException e)
        {
            e.PrintStackTrace();
        }
        return data;
    }

but the error...

Error CS1503: Argument `#3' cannot convert `Java.IO.ByteArrayOutputStream' expression to type `System.IO.Stream' (CS1503) (Foodle.Droid)

how to fix this? or new code to get image from gallery and convert that to byte array is fine.

help!

You could try reading all the data using inputStream.Read(), then using BitmapFactory.DecodeByteArray(bytes, 0, bytes.Length); to get the image — Saranga Athukorale
– Saranga Athukorale, Commented May 3, 2017 at 10:37

zchpit · Accepted Answer · 2018-03-12 18:40:49Z

7

public byte[] convertImageToByte(Android.Net.Uri uri)
{
    Stream stream = ContentResolver.OpenInputStream(uri);   
    byte[] byteArray;

    using (var memoryStream = new MemoryStream())
    {
       stream.CopyTo(memoryStream);
       byteArray = memoryStream.ToArray();
    }
    return byteArray;
}

edited Mar 12, 2018 at 18:40

answered Feb 13, 2018 at 17:31

zchpit

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4 Comments

zchpit Over a year ago

what here is to explain? User want's to take byteArray from android image object (Android.Net.Uri) and this method is doing the job.

zchpit Over a year ago

p.s. eventualy, you can use DI and return Stream stream from android code, and use MemoryStream in shared code.

CDrosos Over a year ago

what is this fileStream?

zchpit Over a year ago

this fileStream is just stream

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