advance_pdf_viewer: any

// Load from assets
PDFDocument doc = await PDFDocument.fromAsset('assets/test.pdf');
 
// Load from URL
PDFDocument doc = await PDFDocument.fromURL('http://www.africau.edu/images/default/sample.pdf');

// Load from file
File file  = File('...');
PDFDocument doc = await PDFDocument.fromFile(file);

// Load specific page
PDFPage pageOne = await doc.get(page: _number);

@override
  Widget build(BuildContext context) {
    Scaffold(
        appBar: AppBar(
          title: Text('Example'),
        ),
        body: Center(
        child: _isLoading
            ? Center(child: CircularProgressIndicator())
            : PDFViewer(document: document)),
    );
  }