小编Amm*_*med的帖子

Flutter 中是否有一种方法或包可以从直接 URL 将文件直接下载到 Android 和 iOS 的下载文件夹，例如：https://******/image.jpg，只需单击一下，无需任何用户开销并下载..

我的应用程序的多个 Flutter iOS 用户在发送上传图像的多部分请求时，在其应用程序中收到以下错误：

SocketException: OS Error: Bad file descriptor, errno = 9, address = <back-end server domain>, port = 64362

发送请求的代码

var request = http.MultipartRequest("POST", uri);
request.files.add(
await http.MultipartFile.fromPath(
 "images",
 imagePath,
 filename: imageName,
 ),
);
request.headers.addAll({
  "Content-type": "multipart/form-data",
});
var response = await request.send();
var response2 = await http.Response.fromStream(response);

我想删除sympy符号表达式中任何等于1的系数，例如：我想要1.0x**2，x**2有办法做到吗？另外，如果可能的话，可以舍入整数，2.0x**2例如2*x**2

我在 Android Studio 上尝试构建 flutter 应用程序时收到以下错误

FAILURE: Build failed with an exception.\n\n* What went wrong:\nExecution failed for task ':app:checkDebugAarMetadata'.\n> Could not resolve all files for configuration ':app:debugRuntimeClasspath'.\n   > Could not find com.otaliastudios:transcoder:0.9.1.\n     Searched in the following locations:\n       - https://dl.google.com/dl/android/maven2/com/otaliastudios/transcoder/0.9.1/transcoder-0.9.1.pom\n       - https://repo.maven.apache.org/maven2/com/otaliastudios/transcoder/0.9.1/transcoder-0.9.1.pom\n       - https://storage.googleapis.com/download.flutter.io/com/otaliastudios/transcoder/0.9.1/transcoder-0.9.1.pom\n     Required by:\n         project :app > project :video_compress\n\n

我尝试flutter clean flutter pub cache repair并删除了 pubspec.lock ..问题仍然没有解决

这是结果flutter doctor

[\xe2\x88\x9a] Flutter (Channel stable, 3.3.4, on Microsoft Windows [Version 10.0.22621.819], locale en-US)\n[\xe2\x88\x9a] Android …