Question

我正在尝试与其他用户共享从颤振相机拍摄的图像。

问题在于，当我尝试共享图像时，出现错误消息：该图像不存在，使我认为存储该图像的临时目录在下一个屏幕出现时不再存在。我的问题是，我可以将其保存到手机上的其他位置以便它仍然存在吗？我正在使用android。这是我得到的错误：

 Unhandled Exception: FileSystemException: Cannot create file, path = '/data/user/0/com.example.pictureapp/cache//data/user/0/com.example.pictureapp/cache/2020-03-20 20:10:24.403289.png' (OS Error: No such file or directory, errno = 2)

我有以下代码：

onPressed: () async {
          // Take the Picture in a try / catch block. If anything goes wrong,
          // catch the error.
          try {
            // Ensure that the camera is initialized.
            await _initializeControllerFuture;

            /////////////////////////////////////////////////////////
            //below is the code I believe needs to be changed
            ////////////////////////////////////////////////////////
            final path = join(
              // Store the picture in the temp directory.
              // Find the temp directory using the `path_provider` plugin.
              (await getTemporaryDirectory()).path,
              '${DateTime.now()}.png',
            );

            // Attempt to take a picture and log where it's been saved.
            await _controller.takePicture(path);

            // If the picture was taken, display it on a new screen.
            Navigator.push(
              context,
              MaterialPageRoute(
                builder: (context) => DisplayPictureScreen(imagePath: path),
              ),
            );
          } catch (e) {
            // If an error occurs, log the error to the console.
            print(e);
          }
        },
      ),
    );
  }
}

// A widget that displays the picture taken by the user.
class DisplayPictureScreen extends StatelessWidget {
  final String imagePath;

  Future<ByteData> getBytesFromFile() async {
  Uint8List bytes = File(imagePath).readAsBytesSync() as Uint8List;
  return ByteData.view(bytes.buffer);
}

  const DisplayPictureScreen({Key key, this.imagePath}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: Text('Display the Picture')),
      // The image is stored as a file on the device. Use the `Image.file`
      // constructor with the given path to display the image.
      body: Image.file(File(imagePath)),
      floatingActionButton: FloatingActionButton(
        onPressed: () {
          /*
            print("in print");
            Share.share(imagePath);
*/


          getBytesFromFile().then((bytes) {
    Share.file('Share via:', imagePath,
        bytes.buffer.asUint8List(), 'image/png');
  });
        }
      )
    );
  }
}

Answer 1

这是从相机拍摄照片的代码。使用此onPressed方法。

    final Directory extDir =
                await getTemporaryDirectory(); //or you can use getApplicationDocumentsDirectory();
            final String dirPath = '${extDir.path}/appName/Camera/Images';

    //I think you are missing below line of code.
            await new Directory(dirPath).create(recursive: true);
            final String filePath = '$dirPath/${timestamp()}.jpg';

            if (_controller.value.isTakingPicture) {
              // A capture is already pending, do nothing.
              //return null;
            }

            try {
              await _controller.takePicture(filePath);
              Navigator.push(
              context,
              MaterialPageRoute(
                builder: (context) => DisplayPictureScreen(imagePath:filePath),
              ),
            );
            } on CameraException catch (e) {
              showException(e);

            }

时间戳方法

String timestamp() => new DateTime.now().millisecondsSinceEpoch.toString();

Answer 2

/data/user/0/com.example.pictureapp/cache//data/user/0/com.example.pictureapp/cache/2020-03-20 20:10:24.403289.png看起来好像您两次附加了temp dir路径。从已发布的代码中尚不清楚此重复发生的位置，但逐步进行操作应该很容易。

保存抖动照相机图像以进行共享

2 个答案: