【flutter上传图片】

1.使用multi_image_picker插件

//选择图片
openPhotoSelect(int maxImages,context) async {
    try {
      List<Asset> images = await MultiImagePicker.pickImages(
        maxImages: maxImages - state.selectImageList.length,
        enableCamera: true,
        cupertinoOptions: CupertinoOptions(takePhotoIcon: "chat"),
        materialOptions: MaterialOptions(
          actionBarTitle: "图片选择",
          allViewTitle: "所有图片",
          useDetailsView: true,
          selectCircleStrokeColor: "#4dc8b6",
          selectionLimitReachedText: "最多选择$maxImages张图片",
        ),
      );

      state.selectImageList.addAll(file);
      state.publishType = 1;
      update();
    } on Exception catch (e) {
      print(e);
    }
  }

		//选择的图片显示
		AssetThumb(
            asset: asset,
            width: 105,
            height: 105,
          )

//上传图片
  Future<bool> uploadImagesData() async {
    state.imageVideoParamList.clear();
    ByteData byteData;
    List<int> imageData;
    MultipartFile multipartFile;
    FormData formData;
    Response response;
    Dio dio = Dio();

    if(state.selectImageList.length > 0){
      for (int i = 0; i < state.selectImageList.length; i++) {
        Asset asset = state.selectImageList[i];
        byteData = await asset.getByteData();
        imageData = byteData.buffer.asUint8List();
        multipartFile =
            MultipartFile.fromBytes(imageData, filename: "${asset.name}");
        formData = FormData.fromMap({
          "android": "1",
          "file": multipartFile,
        });

        response = await dio.post('${MyApi.UPLOAD_FILE}', data: formData);
        if (response.statusCode == 200 && response.data['code'] == 200) {
          state.uploadIndex = i + 1;
          if (i == 0) {
            state.image = response.data['data'] /*+
                '?Size=${asset.originalWidth}x${asset.originalHeight}'*/;

            state.imageVideoParamList.add(
                {
                  'type':'P',
                  'url':'${response.data['data'] +
                      '?Size=${asset.originalWidth}x${asset.originalHeight}'}'
                }
            );

            update();
          } else {
            state.image = "${state.image};" +
                response.data['data'] +
                '?Size=${asset.originalWidth}x${asset.originalHeight}';
            state.imageVideoParamList.add(
                {
                  'type':'P',
                  'url':'${response.data['data'] +
                      '?Size=${asset.originalWidth}x${asset.originalHeight}'}'
                });
            update();
          }
        }
      }
      // 图片上传结束
      if (state.selectImageList.length > state.uploadIndex) {
        // 部分图片上传失败
        state.uploadIndex = null;
        return false;
      }
    }
    return true;
  }
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2.使用wechat_assets_picker插件

// 打开图片选择
  openPhotoSelect(int maxImages,context) async {
    try {
      List<AssetEntity> images = await AssetPicker.pickAssets(
          context,
          maxAssets: maxImages - state.selectImageList.length
      );
      images.forEach((element) async {
        File file = await element.file;
        state.selectImageList.add(file);
      });
      state.publishType = 1;
      update();
    } on Exception catch (e) {
      print(e);
    }
  }
//选择的图片的显示(加透明度渐变动画)
Image(
            width: 105,
            height: 105,
            cacheWidth: 105,
            cacheHeight: 105,
            image: AssetEntityImageProvider(assetEntity, isOriginal: false),
            fit: BoxFit.fill,
            frameBuilder: (context, child, frame, wasSynchronouslyLoaded){
              if(wasSynchronouslyLoaded){
                return child;
              }
              return AnimatedOpacity(
                child: child,
                opacity: frame == null ? 0 : 1,
                duration: const Duration(seconds: 4),
                curve: Curves.easeOut,
              );
            }
          )
//选择的图片的显示（wechat_assets_picker插件提供的方法）
/*Image(
            width: 105,
            height: 105,
            image: AssetEntityImageProvider(assetEntity, isOriginal: false),
            fit: BoxFit.fill,*/

//上传图片
  Future<bool> uploadImagesData() async {
    state.imageVideoParamList.clear();
    ByteData byteData;
    List<int> imageData;
    MultipartFile multipartFile;
    FormData formData;
    Response response;
    Dio dio = Dio();

    if(state.selectImageList.length > 0){
      for (int i = 0; i < state.selectImageList.length; i++) {
        File file = state.selectImageList[i];
        String imageName = file.path.substring(file.path.lastIndexOf("/") + 1, file.path.length);
        multipartFile =
            MultipartFile.fromFileSync(file.path, filename: "$imageName");
        formData = FormData.fromMap({
          "android": "1",
          "file": multipartFile,
        });

        response = await dio.post('${MyApi.UPLOAD_FILE}', data: formData);
        if (response.statusCode == 200 && response.data['code'] == 200) {
          state.uploadIndex = i + 1;
          if (i == 0) {
            state.image = response.data['data'];

            state.imageVideoParamList.add(
                {
                  'type':'P',
                  'url':'${response.data['data']}'
                }
            );

            update();
          } else {
            state.image = "${state.image};" +
                response.data['data'];

            state.imageVideoParamList.add(
                {
                  'type':'P',
                  'url':'${response.data['data']}'
                });
            update();
          }
        }
      }
      // 图片上传结束
      if (state.selectImageList.length > state.uploadIndex) {
        // 部分图片上传失败
        state.uploadIndex = null;
        return false;
      }
    }

    return true;
  }
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选择视频

/// 视频选择
  void openVideoSelect(BuildContext context) async {
    PickedFile pickedFile =
    await ImagePicker().getVideo(source: ImageSource.gallery);
    File videoFile = File(pickedFile.path);
    //state.videoPath = videoFile.path;
    update();
    VideoPlayerController _controller = VideoPlayerController.file(videoFile);
    _controller.initialize().then((_) async {
      Duration duration = _controller.value.duration;
      if (duration.inSeconds > 60) {
        esLoadingToast('发布视频长度不能大于1分钟');
      } else {
        // 解码视频
        Loading.showLoading(context);
       bool end = await openVideoEncode(videoFile.path);
       if(end){
         Loading.hideLoading(context);
       }
      }
    });
  }
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