how to convert an image into base64 in xamarin.android?

Question

I have this code, it works very well in android studio but not in xamarin bitmap.Compress() has different arguments in xamarin and i am confused how to convert

Answer 1

This is how I'm getting a Byte[] for my Bitmap object:

Byte[] imageArray = null;
Bitmap selectedProfilePic = this.GetProfilePicBitmap ();

if (selectedProfilePic != null) {
    using (var ms = new System.IO.MemoryStream ()) {
        selectedProfilePic.Compress (Bitmap.CompressFormat.Png, 0, ms);
        imageArray = ms.ToArray ();
    }
}

Hope this helps.

Answer 2

If you look at the documentation for Bitmap.Compress in Xamarin, you'll see that the last parameter is a Stream.

The equivalent of ByteArrayOutputStream in .NET is MemoryStream, so your code would be:

Bitmap bitmap = BitmapFactory.DecodeResource(Resources, Resource.Drawable.ace1);
MemoryStream stream = new MemoryStream();
bitmap.Compress(Bitmap.CompressFormat.Jpeg, 100, stream);
byte[] ba = stream.ToArray();
string bal = Base64.EncodeToString(ba, Base64.Default);

(You could use Convert.ToBase64String instead of Base64.EncodeToString if you wanted, too.)