如何在Flutter中设置图像选择器中的图像的最大大小

Question

这是我的代码

chooseImage() async {
XFile? pickedFile = await ImagePicker().pickImage(
source: ImageSource.gallery,
);
imagePath = await pickedFile!.readAsBytes();  
}

Answer 1

如果您想要完全阻止超过一定大小的文件，您可以使用它的length属性检查文件的大小，并相应地处理结果

chooseImage() async {
var maxFileSizeInBytes = 2 * 1048576; // 2MB (You'll probably want this outside of this function so you can reuse the value elsewhere)
XFile? pickedFile = await ImagePicker().pickImage(
source: ImageSource.gallery,
);
var imagePath = await pickedFile!.readAsBytes();
var fileSize = imagePath.length; // Get the file size in bytes
if (fileSize <= maxFileSizeInBytes) {
// File is the right size, upload/use it
} else {
// File is too large, ask user to upload a smaller file, or compress the file/image
}
}

Answer 2

可以使用imageQuality属性。图片质量越高，文件大小越大。

chooseImage() async {
XFile? pickedFile = await ImagePicker().pickImage(
source: ImageSource.gallery,
imageQuality: 50, // Set the quality to 50%
);
imagePath = await pickedFile!.readAsBytes();  
}