Flutter PDF阅读插件flutter_full_pdf_viewer的使用

Flutter PDF阅读插件flutter_full_pdf_viewer的使用

Android 和 iOS 支持的 PDF 阅读器！

使用此软件包作为库

1. 依赖于它

在你的 pubspec.yaml 文件中添加以下内容：

dependencies:
  flutter_full_pdf_viewer: ^1.0.6

2. 安装它

你可以通过命令行安装包：

$ flutter packages get

或者，你的编辑器可能支持 pub get 或 flutter packages get。请查阅你的编辑器文档以了解更多信息。

3. 导入它

现在你可以在 Dart 代码中使用以下导入语句：

import 'package:flutter_full_pdf_viewer/flutter_full_pdf_viewer.dart';
import 'package:flutter_full_pdf_viewer/full_pdf_viewer_plugin.dart';
import 'package:flutter_full_pdf_viewer/full_pdf_viewer_scaffold.dart';

4. 在 Android 上发布信息

首先，你需要遵循这些步骤：部署 Android 应用

之后，你需要将 NDK 过滤器添加到你的发布配置中：

buildTypes {
    release {
        signingConfig signingConfigs.release
        minifyEnabled true
        useProguard true
        proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'

        ndk {
            abiFilters 'armeabi-v7a'
        }
    }

    debug {
        minifyEnabled false
        useProguard false
    }
}

现在你的发布应用应该可以正常工作了。

示例代码

以下是完整的示例代码，展示了如何使用 flutter_full_pdf_viewer 插件来打开并显示 PDF 文件：

import 'dart:async';
import 'dart:io';

import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:flutter_full_pdf_viewer/full_pdf_viewer_scaffold.dart';
import 'package:path_provider/path_provider.dart';

void main() {
  runApp(MaterialApp(
    title: 'PDF Viewer Example',
    home: MyApp(),
  ));
}

class MyApp extends StatefulWidget {
  [@override](/user/override)
  _MyAppState createState() => new _MyAppState();
}

class _MyAppState extends State<MyApp> {
  String pathPDF = "";

  [@override](/user/override)
  void initState() {
    super.initState();
    createFileOfPdfUrl().then((f) {
      setState(() {
        pathPDF = f.path;
        print(pathPDF);
      });
    });
  }

  Future<File> createFileOfPdfUrl() async {
    final url = "http://africau.edu/images/default/sample.pdf";
    final filename = url.substring(url.lastIndexOf("/") + 1);
    var request = await HttpClient().getUrl(Uri.parse(url));
    var response = await request.close();
    var bytes = await consolidateHttpClientResponseBytes(response);
    String dir = (await getApplicationDocumentsDirectory()).path;
    File file = new File('$dir/$filename');
    await file.writeAsBytes(bytes);
    return file;
  }

  [@override](/user/override)
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text('PDF Viewer Example')),
      body: Center(
        child: RaisedButton(
          child: Text("打开 PDF"),
          onPressed: () => Navigator.push(
            context,
            MaterialPageRoute(builder: (context) => PDFScreen(pathPDF)),
          ),
        ),
      ),
    );
  }
}

class PDFScreen extends StatelessWidget {
  String pathPDF = "";
  PDFScreen(this.pathPDF);

  [@override](/user/override)
  Widget build(BuildContext context) {
    return PDFViewerScaffold(
        appBar: AppBar(
          title: Text("文档"),
          actions: <Widget>[
            IconButton(
              icon: Icon(Icons.share),
              onPressed: () {},
            ),
          ],
        ),
        path: pathPDF);
  }
}