Maui Android PDF Renderer example

gistfile1.txt

namespace TestApp.Platforms.Android.Services
{
    internal class PDFRenderService : IPDFRenderService
    {
        private AppCompatActivity activity;

        public PDFRenderService(AppCompatActivity activity)
        {
            this.activity = activity;
        }

        public byte[] RenderPdf(string filePath, int pageNum, int left, int top, int right, int bottom, int width)
        {
            //var fileStreamPath = this.activity.GetFileStreamPath(filePath);
            var fileStreamPath = new Java.IO.File(filePath);
            var renderer = new PdfRenderer(ParcelFileDescriptor.Open(fileStreamPath, ParcelFileMode.ReadOnly));
            //var screenWidth = Resources.System.DisplayMetrics.WidthPixels;

            var page = renderer.OpenPage(pageNum);

            // create bitmap at appropriate size
            var ratio = (float)page.Height / page.Width;
            var newHeight = width * ratio;
            var bitmap = Bitmap.CreateBitmap(width, (int)newHeight, Bitmap.Config.Argb8888);

            // render PDF page to bitmap
            var rect = new androidGraphics.Rect(left, top, right, bottom);
            page.Render(bitmap, rect, null, PdfRenderMode.ForPrint);
            page.Close();
            renderer.Close();

            using (var ms = new MemoryStream())
            {
                if (bitmap.Compress(Bitmap.CompressFormat.Png, 100, ms))
                {
                    return ms.ToArray();
                }
            }

            return null;
        }
    }
}