imagepicker不会将文件复制到flutter中的其他位置

问题描述

我是Flutter的新手。我只想拍照并显示相机和图库应用程序。但是当我使用下面的代码时，它不会将图库文件保存在应用程序目录中。

实际上，路径提供程序在哪里存储文件，为什么不复制它？ 我缺少任何许可吗..请帮助我

import 'package:Flutter/material.dart';
import 'dart:io';

import 'package:image_picker/image_picker.dart';
import 'package:path/path.dart';
import 'package:path_provider/path_provider.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatefulWidget {
  @override
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  File _storedImage;

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Imagesave',theme: ThemeData(
        primarySwatch: Colors.blue,visualDensity: VisualDensity.adaptivePlatformDensity,),home: Scaffold(
        appBar: AppBar(
          title: Text('image save'),body: Column(
          children: [
            _storedImage != null
                ? Image.file(_storedImage)
                : Text('No image selected'),RaisedButton(
              child: Text("hi"),onpressed: () {
                _takePicture();
              },)
          ],);
  }

  void _takePicture() async {
    // 1. Create an ImagePicker instance.
    final ImagePicker _picker = ImagePicker();

    
    final PickedFile pickedImage =
        await _picker.getimage(source: ImageSource.gallery);

        if (pickedImage == null) {
      return;
    }

        File tmpFile = File(pickedImage.path);

        Directory directory = await getApplicationDocumentsDirectory();
    final String path = directory.path;
    final String fileName =
        basename(tmpFile.path); // Filename without extension
    final String fileExtension = extension(tmpFile.path); // e.g. '.jpg'

        File tmpFile2 = await tmpFile.copy('$path/$fileName$fileExtension');

        setState(() {
      _storedImage = tmpFile2;
    });
    //setState(() => _storedImage = tmpFile);
  }
}

解决方法

1。添加最新版本的Dependency image_picker和路径提供程序

2。在清单文件中授予以下权限

uses-permission android：name =“ android.permission.READ_EXTERNAL_STORAGE”

uses-permission android：name =“ android.permission.WRITE_EXTERNAL_STORAGE”

uses-permission android：name =“ android.permission.CAMERA”

3.pub获得

4。再次运行