How to set maximum size of image from image Picker in Flutter

this is my code

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

If you want to completely block files over a certain size, you can check the size of the file using it's length property, and handle the result accordingly

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
    }
}