It may sound simple, but when it comes to Xamarin, all the problems starts to emerge. So basically Xamarin does not provide any special class for PDF generation.
Failed Solution 1
So we were let alone to use the Android PDFDocument class. Which Unlike in the Native Android did not work. Actually it was giving me a White and blank document. When searching for the Xamarin Documentation what I found was the Xamarin documentation having the Android Reference Code which is very disappointing (Link to Documentation)
Here is the Code snippet for it(I may have made a mistake here, let me know if you guys found a solution for using PDFDocument class )
private String sdCardPathforPDF; private String filePath; private FileStream stream; sdCardPathforPDF = Environment.ExternalStorageDirectory.AbsolutePath; filePath = Path.Combine(sdCardPathforPDF, "MyPDF/test5.pdf"); stream = new FileStream(filePath, FileMode.Create); tView = new TextView(context); tView.SetTextColor(Color.ParseColor(resource.GetString(Resource.Color.black))); tView.Text = "Hello"; tView.SetHeight(50); tView.SetWidth(50); var document = new PdfDocument(); var pageInfo = new PdfDocument.PageInfo.Builder(612, 792, 1).Create(); var page = document.StartPage(pageInfo); tView.Draw(page.Canvas); document.FinishPage(page); document.WriteTo(stream); stream.Close(); document.Close(); Toast.MakeText(context, "PDF Generated", ToastLength.Short).Show();
Failed Solution 2
Then I searched for a plugin or a 3rd party library, ohhh my god, I found some expensive plugins
Who would love to buy a plugin for 1600 usd??? Apitron and XFINIUM are some of them
Failed Solution 3
I found some Free open source libraries for Android, so I thought of Java Bind it, but when i tried to Java Bind them, but I ended up getting lots of errors that i cannot fix it unless I am the developer of that library. So I dropped that Idea as well.
Failed Solution 4
Then after the disappointment of JavaBind, I came across an article saying that the iText library has been published for .Net in the name of iTextSharp. But when I added that Nuget Package I came across an error saying that
System.IO.FileNotFoundException: Could not load assembly 'System.Drawing, Version=188.8.131.52, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'. Perhaps it doesn't exist in the Mono for Android profile?
so It says there is an assembly called System.Drawing dll is missing. I tried to manually add it but it did not work. When I researched on it, it said that Mono for Android(Xamarin Android Framework) does not include that ‘dll’ I dont know how come a popular ‘dll’ got missed out of their framework.
At last a solution that Worked
So with all of the frustration I had, I did not give up on finding a solution till i came across problem where a guy has used ‘iTextSharp’ in Xamarin Android and its working. But he did not mention or reply my question in that thread. So I thought of giving a final look at the Nuget Manager. This time just like the previous time I searched for ‘iTextSharp’ but this time I went through each and every result the list showed.
And Hoooray I found It the one I am searching for, some one has made a nuget of ‘iTextSharp’ for Xamarin, its called “Xam.iTextSharpLGPL”
And this worked like a Magic. And this library has more functionality than the default PDFDocument.
This library is based on iTextSharp 4.1.6 which means licensed under LGPL. Free to use and it is an Open source library.
Open source project can be found in Bit Bucket : https://bitbucket.org/smarongiu/xam.itextsharplgpl
So this is the Basic code of Writing a Simple PDF Doc
System.IO.FileStream fs = new FileStream(Server.MapPath("pdf") + "\\" + "First PDF document.pdf", FileMode.Create) // Create an instance of the document class which represents the PDF document itself. Document document = new Document(PageSize.A4, 25, 25, 30, 30); // Create an instance to the PDF file by creating an instance of the PDF Writer class, using the document and the filestrem in the constructor. PdfWriter writer = PdfWriter.GetInstance(document, fs); Before we can write to the document, we need to open it. // Open the document to enable you to write to the document document.Open(); // Add a simple and well known phrase to the document in a flow layout manner document.Add(new Paragraph("Hello World!")); // Close the document document.Close(); // Close the writer instance writer.Close(); // Always close open file handles explicitly fs.Close();
I grabbed this quick code snippet from Micke Blomquist
Hope this article will help people like me in future…!