create image file from byte array in documents Xamarin Android

问题

Could anyone help me about how to create image file from byte array in documents Xamarin Android and get the new path for the image please ?

Here my code :

Stream stream = ContentResolver.OpenInputStream(data.Data);
Bitmap bitmap = BitmapFactory.DecodeStream(stream);
MemoryStream memStream = new MemoryStream();
bitmap.Compress(Bitmap.CompressFormat.Jpeg, 50, memStream);
byte[] picData;
picData = memStream.ToArray();

now picData is byte array, and I need to create a Jpeg file in doucments and get the new path .. Thanks advance.

回答1:

You can bypass using a MemoryStream and decode/compress an Android Bitmap directly to a FileStream to save resources (memory and processing time):

var bitmap = BitmapFactory.BitmapFactory.DecodeStream(stream);
var path = Path.Combine(GetExternalFilesDir(Environment.DirectoryDocuments).AbsolutePath, "sameImagePath.jpg");
if (!File.Exists(path))
{
    using (var filestream = new FileStream(path, FileMode.Create))
    {
        if (bitmap.Compress(Bitmap.CompressFormat.Jpeg, 50, filestream))
        {
            filestream.Flush();
        }
        else {} // handle failure case...
    }
}
bitmap.Recycle();
bitmap.Dispose();

来源：https://stackoverflow.com/questions/43899497/create-image-file-from-byte-array-in-documents-xamarin-android