Question

我有{_1}}，名称为_pickedImage。我遇到句柄File.path null的问题，我已经使用以下代码处理File null：

path

或

 if (pickedImage.path == null)

每次我按下按钮时，我都无法处理File.path if (pickedImage.path.isEmpty)，并且收到此错误。

null

我做错了吗？

Answer 1

$ ansible --version
ansible 2.3.0.0
  config file = /etc/ansible/ansible.cfg
  configured module search path = Default w/o overrides
  python version = 2.7.5 (default, Nov  6 2016, 00:28:07) [GCC 4.8.5 20150623 (Red Hat 4.8.5-11)]

错误仅是因为您试图从═══════ Exception caught by gesture ═══════════════════════════════════════════ The following NoSuchMethodError was thrown while handling a gesture: The getter 'path' was called on null. Receiver: null Tried calling: path获取路径。

在调用下一个代码之前，您需要检查文件是否为空：

null File

Answer 2

看起来变量pickedImage本身为空。尝试这样

if(pickedImage?.path?.isEmpty != false)

或

if(pickedImage == null || pickedImage.path == null || pickedImage.path.isEmpty)

Flutter：处理File.path空/空

2 个答案: