flutter pdf 檔案瀏覽

1.在 pubspec.yaml 檔案中新增如下的包：

dependencies:

# pdf 閱讀器
flutter_full_pdf_viewer: ^1.0.6
# 獲取系統目錄，因為從網路獲取的pdf檔案，需要儲存到手機，所以需要用到這個包
path_provider: ^1.5.0

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() 
@override
} string pathpdf = "";
@override
void initstate() );
});} futurecreatefileofpdfurl() async 
@override
widget build(buildcontext context) 
}/// /////////////////////////// 顯示 pdf **件 //////////////////////////// ///
class pdfscreen extends statelesswidget ,
),],
),path: pathpdf,
);}}

主要有兩個原始碼檔案，分別是 full_pdf_viewer_plugin.dart 和 full_pdf_viewer_scaffold.dart 檔案

1.full_pdf_viewer_plugin.dart

import 'dart:async';

import 'dart:ui';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
enum pdfviewstate 
class pdfviewerplugin 
final _ondestroy = new streamcontroller.broadcast();
streamget ondestroy => _ondestroy.stream;
future_handlemessages(methodcall call) async 
} futurelaunch(string path, ) async ;
if (rect != null) ;
}await _channel.invokemethod('launch', args);
} /// close the pdfviewer
/// will trigger the [ondestroy] event
future close() => _channel.invokemethod('close');
/// adds the plugin as activityresultlistener
/// only needed and used on android
future registeracitivityresultlistener() =>
_channel.invokemethod('registeracitivityresultlistener');
/// removes the plugin as activityresultlistener
/// only needed and used on android
future removeacitivityresultlistener() =>
_channel.invokemethod('removeacitivityresultlistener');
/// close all streams
void dispose() 
/// resize pdfviewer
futureresize(rect rect) async ;
args['rect'] = ;
await _channel.invokemethod('resize', args);
}}

import 'dart:async';

import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:flutter_full_pdf_viewer/full_pdf_viewer_plugin.dart';
class pdfviewerscaffold extends statefulwidget ) : super(key: key);
@override
_pdfviewscaffoldstate createstate() => new _pdfviewscaffoldstate();
}class _pdfviewscaffoldstate extends state
@override
void dispose() 
@override
widget build(buildcontext context) else );}}
return new scaffold(
body: const center(child: const circularprogressindicator()));
} rect _buildrect(buildcontext context) 
return new rect.fromltwh(0.0, top, mediaquery.size.width, height);
}}原文：

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