android – PDF file download from url and store on internal storage then try to open it from any PDF reader its shows file format is not supported in flutter-ThrowExceptions

Exception or error:

I am trying to open my downloaded PDF file within my app then it shows fine, but when I open it from any other app like PDF reader its shows file format is not supported.

  • PDF file is stored in this directory:
    internal storage/MyApp/pdf
  • I want to access that PDF file from any PDF reader or its open from my file manager so what needs to do.
  • I am not using path directory of getExternalStorageDirectory()
  • I give internal storage path direct like /storage/emulated/0/MyApp

This is my complete code

import 'dart:io';
import 'package:flutter/material.dart';
import 'package:logger/logger.dart';
import 'package:open_file/open_file.dart';
import 'package:path_provider/path_provider.dart';
import 'package:http/http.dart' as http;

void main(){
  runApp(new MaterialApp(
      debugShowCheckedModeBanner: false,
      home: new FileDownloadView()

  ));
}


class FileDownloadView extends StatefulWidget {
  @override
  _FileDownloadViewState createState() => _FileDownloadViewState();
}

class _FileDownloadViewState extends State<FileDownloadView> {
  String _filePath = "";

  Future<String> get _localDevicePath async {

    final _devicePath = await getExternalStorageDirectory();
    return _devicePath.path;
  }

  Future<File> _localFile({String path, String type}) async {
    String _path = await _localDevicePath;

    var _newPath = await Directory("/storage/emulated/0/$path").create();
    return File("${_newPath.path}/pdf.$type");
  }

  Future _downloadSamplePDF() async {
    final _response =
    await http.get("https://firebasestorage.googleapis.com/v0/b/text-recognition-28371.appspot.com/o/Direct%20Recruitment%202020.pdf?alt=media&token=114498c1-0e84-48e0-bda0-15d4b688f745");
    if (_response.statusCode == 200) {
      final _file = await _localFile(path: "MyApp", type: "pdf");
      final _saveFile = await _file.writeAsBytes(_response.bodyBytes);

      Logger().i("File write complete. File Path ${_saveFile.path}");
      setState(() {
        _filePath = _saveFile.path;
      });
    } else {
      Logger().e(_response.statusCode);
    }
  }

  Future _downloadSampleVideo() async {
    final _response = await http.get(
        "https://sample-videos.com/video123/mp4/720/big_buck_bunny_720p_2mb.mp4");
    if (_response.statusCode == 200) {
      final _file = await _localFile(type: "mp4", path: "videos");
      final _saveFile = await _file.writeAsBytes(_response.bodyBytes);
      Logger().i("File write complete. File Path ${_saveFile.path}");
      setState(() {
        _filePath = _saveFile.path;
      });
    } else {
      Logger().e(_response.statusCode);
    }
  }


  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            FlatButton.icon(
              icon: Icon(Icons.file_download),
              label: Text("Sample Pdf"),
              onPressed: () {
                _downloadSamplePDF();



              },
            ),
            FlatButton.icon(
              icon: Icon(Icons.file_download),
              label: Text("Sample Videos"),
              onPressed: () {
                _downloadSampleVideo();

              },
            ),
            Text(_filePath),
            FlatButton.icon(
              icon: Icon(Icons.shop_two),
              label: Text("Show"),
              onPressed: () async {
                final _openFile = await OpenFile.open(_filePath);
                Logger().i(_openFile);
              },
            ),
          ],
        ),
      ),
    );
  }
}

Android Manifest

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example2.downloder_app">
    <uses-permission android:name="android.permission.INTERNET"></uses-permission>
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"></uses-permission>
    <uses-permission android:name="android.permission.READ_PHONE_STATE"></uses-permission>
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
    <!-- io.flutter.app.FlutterApplication is an android.app.Application that
         calls FlutterMain.startInitialization(this); in its onCreate method.
         In most cases, you can leave this as-is, but you if you want to provide
         additional functionality it is fine to subclass or reimplement
         FlutterApplication and put your custom class here. -->
    <application
        android:name="io.flutter.app.FlutterApplication"
        android:label="downloder_app"
        android:icon="@mipmap/ic_launcher"
        android:testOnly="false">
        <activity
            android:name=".MainActivity"
            android:launchMode="singleTop"
            android:theme="@style/LaunchTheme"
            android:configChanges="orientation|keyboardHidden|keyboard|screenSize|smallestScreenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
            android:hardwareAccelerated="true"
            android:windowSoftInputMode="adjustResize">
            <intent-filter>
                <action android:name="android.intent.action.MAIN"/>
                <category android:name="android.intent.category.LAUNCHER"/>
            </intent-filter>
        </activity>
        <!-- Don't delete the meta-data below.
             This is used by the Flutter tool to generate GeneratedPluginRegistrant.java -->
        <meta-data
            android:name="flutterEmbedding"
            android:value="2" />
    </application>
</manifest>
How to solve:

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