Question

我想从选定的多个图像中获取一个图像路径，我正在使用此link来选择多个图像，但是我有资产，我希望从选定的多个图像中获取路径，因为我想上传到API。我在pubspec.yaml中添加了此依赖项，如果有任何好的方法，请告诉我

multi_image_picker: ^4.6.3

这是我的文件上传类，该用户界面类似于Facebook。

import 'dart:typed_data';
import 'package:auto_size_text/auto_size_text.dart';
import 'package:flutter/material.dart';
import 'package:multi_image_picker/multi_image_picker.dart';

class UpdateStatus extends StatefulWidget {
  @override
  _UpdateStatusState createState() => _UpdateStatusState();
}

class _UpdateStatusState extends State<UpdateStatus> {
  List<Asset> images = List<Asset>();
  String _error = 'No Error Dectected';

  Future<ByteData> byteData;
 // List<int> imageData = byteData.buffer.asUint8List();

  @override
  void initState() {
    // TODO: implement initState
    super.initState();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Create Post'),
        actions: <Widget>[
          Padding(
            padding: const EdgeInsets.all(18.0),
            child: InkWell(child: Text('POST',style: TextStyle(fontSize: 18.0),),onTap: ()
              {
                print('Post this post');
              },),
          )
        ],
      ),
      body: SingleChildScrollView(
        child: Container(
          height: MediaQuery.of(context).size.height,
          width:MediaQuery.of(context).size.width ,
          color: Colors.white,
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.stretch,
            children: <Widget>[
              Container(
                height: 300.0,
                color: Colors.white,
                child: Padding(
                  padding: const EdgeInsets.all(8.0),
                  child: TextFormField(
                    keyboardType: TextInputType.multiline,
                    maxLines: 100,
                      style: new TextStyle(
                          fontSize: 18.0,
                          color: Colors.black
                      ),
                    decoration: InputDecoration(
                      hintText: 'Enter your Post Details Here !',
                      border: InputBorder.none,
                    ),
                  ),
                ),
              ),
              Divider(
                thickness: 1.0,
              ),
              Column(
                children: <Widget>[
                  Container(
                    height: 40.0,
                    color: Colors.white70,
                    child: Padding(
                      padding:EdgeInsets.only(left: 18.0,),
                      child: InkWell(
                        child: Row(
                          children: <Widget>[
                            Icon(Icons.add_a_photo,),
                            Text("  Choose Image",style: TextStyle(fontSize: 24.0,),),
                          ],
                        ),
                        onTap: ()
                        {
                          print(images.toList().toString());
                          print('choose image from local');
                        },
                      ),
                    ),
                  ),
                  Divider(
                    thickness: 1.0,
                  ),
                  Container(
                    height: 40.0,
                    color: Colors.white70,
                    child: Padding(
                      padding:EdgeInsets.only(left: 18.0,),
                      child: InkWell(
                        child: Row(
                          children: <Widget>[
                            Icon(Icons.add_photo_alternate,),
                            Text("  Choose Video",style: TextStyle(fontSize: 24.0,),),
                          ],
                        ),
                        onTap: ()
                        {
                          print('choose video from local');
                        },
                      ),
                    ),
                  ),
                ],
              ),
              Divider(
                thickness: 1.0,
              ),
         Container(
           height: 200,
              child: Column(
                children: <Widget>[
                  Center(child: Text('Error: $_error')),
                  RaisedButton(
                    child: Text("Pick images"),
                    onPressed: loadAssets,
                  ),
                  Expanded(
                    child: buildGridView(),
                  )
                ],
              ),
         ),
         /*
          Column(
            children: <Widget>[
              Center(child: Text('Error: $_error')),
              RaisedButton(
                child: Text("Pick images"),
                onPressed: loadAssets,
              ),
              Expanded(
                child: buildGridView(),
              )
            ],
          ),

              */
            ],
          ),
        ),
      ),
    );
  }

  Future<void> loadAssets() async {

    List<Asset> resultList = List<Asset>();
    String error = 'No Error Dectected';

    ByteData byteData;


    try {
      resultList = await MultiImagePicker.pickImages(
        maxImages: 300,
        enableCamera: true,
        selectedAssets: images,
        cupertinoOptions: CupertinoOptions(takePhotoIcon: "chat"),
        materialOptions: MaterialOptions(
          actionBarColor: "#abcdef",
          actionBarTitle: "Ilma",
          allViewTitle: "All Photos",
          useDetailsView: false,
          selectCircleStrokeColor: "#000000",
        ),
      );

    } on Exception catch (e) {
      error = e.toString();
    }

    // If the widget was removed from the tree while the asynchronous platform
    // message was in flight, we want to discard the reply rather than calling
    // setState to update our non-existent appearance.
    if (!mounted) return;

    setState(() {
      images = resultList;
      _error = error;
      print('000000000000000000000');
      print('000000000000000000000');
      print(images);
      print('000000000000000000000');
      print('000000000000000000000');
    });



  }

  Widget buildGridView() {
    return GridView.count(
      crossAxisCount: 3,
      children: List.generate(images.length, (index) {
        Asset asset = images[index];

        byteData=asset.getByteData();

        print('0000');
        print(byteData);
        print('0000');



        return AssetThumb(
          asset: asset,
          width: 300,
          height: 300,
        );
      }),
    );
  }

}

Answer 1

Padding(
            padding: const EdgeInsets.all(18.0),
            child: InkWell(
              child: Text(
                'POST',
                style: TextStyle(fontSize: 18.0),
              ),
              onTap: () async {

 List<MultipartFile> multipart = List<MultipartFile>();

                for (int i = 0; i < images.length; i++) {
                  var path = await FlutterAbsolutePath.getAbsolutePath(images[i].identifier);

                }   

              },
            ),
          )

Answer 2

我正在使用下面的代码通过 file_picker：^ 2.0.7 库选择多张图像。长按选择多个图像。选择“图像”后，您可以使用 f arr显示图像。

List<File> f = List();

 RaisedButton(
            child: Text("Pick Image"),
            onPressed: () async {
              FilePickerResult result = await FilePicker.platform.pickFiles(
                allowMultiple: true,
                type: FileType.custom,
                allowedExtensions: ['jpg', 'png', 'jpeg'],
              );
              if (result != null) {
                f = result.paths.map((path) => File(path)).toList();
                setState(() {});
                print(f);
              }
            },
          ),

样本API调用用于图像上传和常规数据。图片上传列应为arr（photo []）。

 List<MultipartFile> newList = new List<MultipartFile>();


Future<String> ImageUpload() async {

var request = http.MultipartRequest('POST', url);
 request.headers["Authorization"] = pref.getString("token");
    request.headers["Accept"] = "application/json";
   //Image Data
  for (int i = 0; i < f.length; i++) {
      newList.add(await http.MultipartFile.fromPath('photo[]', f[i].path));
    }
    request.files.addAll(newList);
    
    Map<String, dynamic> data = Map<String, String>();
    //normal data
    data["user_id"] = user_id;
    data["project_id"] = pro_id;
    
    request.fields.addAll(data);
    var res = await request.send();
    
    if (res.statusCode == 200) {
      debugPrint("Status${res}");
      }else {
      debugPrint("status code${res}");
      }
      
    }

Try This You can select and upload multiple images easily. Thank you.

Answer 3

您还可以使用 file_picker：^ 1.5.0 + 2 库选择多张图片，并轻松获取所选图片的路径

internal void Reset()
{
    // Retrieves only the fields of this Class
    var bindingFlags = BindingFlags.Instance
                       | BindingFlags.NonPublic
                       | BindingFlags.Public;
    List<FieldInfo> members = this.GetType()
                                  .GetFields(bindingFlags)
                                  .Where(f => f.MemberType == MemberTypes.Field)
                                  .Where(value => value != null)
                                  .ToList();

    // Set all fields to its default type value
    for (int i = 0; i < members.Count(); i++)
    {
        // This expression represents the default value of a type
        // (0 for integer, null for a string, etc.)
        Expression defaultExpr = Expression.Default(typeof(byte));
        // The following statement first creates an expression tree,
        // then compiles it, and then executes it.
        var defaultValue = Expression.Lambda<Func<byte>>(defaultExpr).Compile()();
        // Set the default value
        members[i].SetValue(this, defaultValue);
    }
}

}

使用这样的ListView Builder显示所选图像

Future<int> getFilePath() async {
try {
  files = await FilePicker.getMultiFile();
  if (files == '') {
    return 0;
  }
  else
  {
    setState(() {
      this._filePath = files;
      return 1;
    });
  }

} on PlatformException catch (e) {
  print("Error while picking the file: " + e.toString());
}

Answer 4

使用 multi_image_picker 4.7.14 库选择多个图像。使用以下代码，您可以将选定的资产图片作为文件发送。 `

//Inside Widget Builder
FlatButton(
            child: Image.asset(
              "assets/images/camera.png",
              color: Colors.grey,
            ),
            onPressed: loadAssets,
          ),
          
    SizedBox(
                  // height: SizeConfig.safeBlockHorizontal * 10,
                  height: MediaQuery.of(context).size.height / 2,
                  child: Column(
                    children: <Widget>[
                      Expanded(
                        child: buildGridView(),
                      ),
                    ],
                  ),
                )

List<File> fileImageArray = [];
  List<String> f = List();
  List<Asset> resultList = List<Asset>();
  List<Asset> images = List<Asset>();
  
  Future<void> loadAssets() async {
    try {
      resultList = await MultiImagePicker.pickImages(
        maxImages: 4,
        enableCamera: true,
        selectedAssets: images,
        cupertinoOptions: CupertinoOptions(takePhotoIcon: "chat"),
        materialOptions: MaterialOptions(
          actionBarColor: "#abcdef",
          actionBarTitle: "Example App",
          allViewTitle: "All Photos",
          useDetailsView: false,
          selectCircleStrokeColor: "#000000",
        ),
      );
    } on Exception catch (e) {
      error = e.toString();
    }

    if (!mounted) return;

    for (int i = 0; i < resultList.length; i++) {
      var path =
          await FlutterAbsolutePath.getAbsolutePath(resultList[i].identifier);
      print(path);
      f.add(File(path));
    }

    setState(() {
      images = resultList;
    });

    // return fileImageArray;
  }

//image PreView
  Widget buildGridView() {
    return GridView.count(
      crossAxisCount: 4,
      children: List.generate(images.length, (index) {
        Asset asset = images[index];
        return AssetThumb(
          asset: asset,
          width: 50,
          height: 50,
        );
      }),
    );
  }

API调用：在图片上传位置使用多部分文件

List<MultipartFile> newList = new List<MultipartFile>();
    
  Future<String> multiImagePostAPI() async {
    var request = http.MultipartRequest('POST', url);
    request.headers["Authorization"] = pref.getString("token");
    request.headers["Accept"] = "application/json";
    
     for (int i = 0; i < f.length; i++) {
      newList.add(await http.MultipartFile.fromPath('photo[]', f[i].path));
    }
    request.files.addAll(newList);
     Map<String, dynamic> data = Map<String, String>();
      data["user_id"] = user_id;
      data["project_id"] = pro_id;
      data["title"] = titleController.text;

      request.fields.addAll(data);

      var res = await request.send();
     
     if (res.statusCode == 200) {
      debugPrint("Status$res");
     }else {
      debugPrint("status : $res");
      }
      
     
     }

在Flutter中如何使用多图像选择器选择图像后如何获取图像路径？

4 个答案: