I am trying to generate pdf in flutter application using " Pdf creation library". While generating pdf in other language it gives exception

I have had similar error when am trying to generate pdf in flutter application using “ Pdf creation library”. While generating pdf have right single quotation mark " ’ " "&#8217" in my source text.

Code with error

final String soutceString = 'My source text with " ’ "';final Document pdf = Document(deflate: zlib.encode);pdf.addPage(    MultiPage(       build: (Context context) => <Widget>[            Paragraph(text: soutceString),       ]    ));

Error log

flutter: 'package:pdf/src/font.dart': Failed assertion: line 145 pos 14: 'false':---------------------------------------------Can not decode the string to Latin1.This font does not support Unicode characters.If you want to use strings other than Latin strings, use a TrueType (TTF) font instead. 

When I found wrong symbol I just replace it.

Code with fast fix

final String sourceString = 'My source text with " ’ "';final Document pdf = Document(deflate: zlib.encode);sourceString.replaceAll('’', '`'),pdf.addPage(MultiPage(   build: (Context context) => <Widget>[            Paragraph(text: sourceString)        ]    ));

But I was afraid, of new wrong symbol come in future. I added arial.ttf fonts in to assets (arial.ttf contain my symbol) and use it. Adding assets

Best case for me

import 'package:flutter/services.dart' show rootBundle;final String sourceString = 'My source text with " ’ "';final Document pdf = Document(deflate: zlib.encode);pdf.addPage(MultiPage(     theme: Theme.withFont(        base: Font.ttf(await rootBundle.load("assets/arial.ttf")),        bold: Font.ttf(await rootBundle.load("assets/arial.ttf")),        italic: Font.ttf(await rootBundle.load("assets/arial.ttf")),        boldItalic: Font.ttf(await rootBundle.load("assets/arial.ttf")),      ),   build: (Context context) => <Widget>[            Paragraph(text: sourceString)          ]    ));