App clash after build the apk

[Silerqin]

I am using flutter_pdfview which is version ^1.0.0+10 to open a PDF file in flutter apps. When my app is in debug mode, there is no error. After I build the app the PDF file cannot open in apps. My app will clash and close the app suddenly. I have open the permission in AndroidManifest.xml:

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />

Here is my code:

@override
  Widget build(BuildContext context) {
    return MaterialApp(
        body: Center(
          child: Builder(
            builder: (context) => Column(children: <Widget>[
                    RaisedButton(child: Text("Open PDF "),onPressed: () {
                     Navigator.push(context,MaterialPageRoute(builder: (context) =>
                       PdfViewPage(path: '/storage/emulated/0/Download/$pdfName')));
                        }
                      },
                    )
                  ],
                ),
          ),
        ),
      ),
    );
  }
}

class PdfViewPage extends StatefulWidget {
  final String path;

  const PdfViewPage({Key key, this.path}) : super(key: key);
  @override
  _PdfViewPageState createState() => _PdfViewPageState();
}

class _PdfViewPageState extends State<PdfViewPage> {
  int _totalPages = 0;
  int _currentPage = 0;
  bool pdfReady = false;
  PDFViewController _pdfViewController;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
      ),
      body: Stack(
        children: <Widget>[
          PDFView(
            filePath: widget.path,
            autoSpacing: true,
            enableSwipe: true,
            pageSnap: true,
            swipeHorizontal: true,
            nightMode: false,
            onError: (e) {
              print(e);
            },
            onRender: (_pages) {
              setState(() {
                _totalPages = _pages;
                pdfReady = true;
              });
            },
            onViewCreated: (PDFViewController vc) {
              _pdfViewController = vc;
            },
            onPageChanged: (int page, int total) {
              setState(() {});
            },
            onPageError: (page, e) {},
          ),
          !pdfReady
              ? Center(
                  child: CircularProgressIndicator(),
                )
              : Offstage()
        ],
      ),
    );
  }
}

How can solve this error? Thanks in advanced

[RomeoDar]

Did You Find Any Solutiuon Yet ? https://stackoverflow.com/questions/60617934/how-to-open-pdf-file-in-the-app-using-flutter (Proguard-rule solve this issue or not ? )