Question

在使用 aptter build 构建的apk中完成pdf下载后，我的应用程序崩溃了。

下载完成后，在调试时的相同操作中，控制台会出现错误，但不会崩溃，并且pdf_viewer可以正常工作。

 W/System  (31159): A resource failed to call release.

请建议下载文件后，我该如何阻止我的应用崩溃。

代码是这样的

import 'dart:async';
import 'package:firebase_storage/firebase_storage.dart';
import 'package:flutter/material.dart';
import 'package:flutter_pdfview/flutter_pdfview.dart';
import 'package:fluttertoast/fluttertoast.dart';
import 'dart:io';
import 'package:path_provider/path_provider.dart';

class PdfViewerPage extends StatefulWidget {
  final name;
  final title;
  PdfViewerPage({this.name, this.title});
  @override
  _PdfViewerPageState createState() => _PdfViewerPageState();
}

class _PdfViewerPageState extends State<PdfViewerPage> {
  bool loading = true;
  String localfile;
  int current = 1;
  int total;

  Future<String> loaddata() async {
    var dir = await getTemporaryDirectory();
    File file = new File(dir.path + widget.name);

    await FirebaseStorage()
        .ref()
        .child(widget.name)
        .getData(50000000)
        .then((value) async {
      file.writeAsBytes(value);
    }).catchError((onError) {
      Fluttertoast.showToast(msg: onError);
    });
    return file.path;
  }

  @override
  void initState() {
    super.initState();
    loaddata().then((value) {
      setState(() {
        localfile = value;
        loading = false;
      });
    });
  }

  @override
  Widget build(BuildContext context) {
    return SafeArea(
        child: Scaffold(
      appBar: AppBar(
        title: Text(widget.title, style: TextStyle(color: Colors.black)),
      ),
      body: loading
          ? Center(
              child: CircularProgressIndicator(),
            )
          : PDFView(
              filePath: localfile,
              fitEachPage: true,
              onPageChanged: (t, c) {
                setState(() {
                  current = t + 1;
                  total = c;
                });
              },
            ),
      floatingActionButton: total != null
          ? FloatingActionButton.extended(
              backgroundColor: Colors.white,
              onPressed: () {},
              label: Row(
                mainAxisAlignment: MainAxisAlignment.spaceAround,
                children: <Widget>[
                  Text(current.toString()),
                  SizedBox(
                    width: 20,
                  ),
                  Text(total.toString())
                ],
              ))
          : Container(),
    ));
  }
}

Answer 1

我在StackOverflow link上发现了类似的问题。

当我们从代码构建apk时，Flutter阻止了插件代码，这导致应用程序崩溃。解决方案是使用progaurd规则来启用pdf插件。链接中提到了ProGaurd规则。

使用flutter_pdfview软件包时Flutter应用程序崩溃

1 个答案: