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flutter - 颤振：处理 File.path 空/空

问题描述

我有File名字 _pickedImage。我面临处理 File.path null 的问题，我已经path用这段代码处理了 null ：

 if (pickedImage.path == null)

或者

if (pickedImage.path.isEmpty)

每次我按下按钮时，我都无法处理 File.pathnull并且我收到此错误。

═══════ 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

Handler: "onTap"
Recognizer: TapGestureRecognizer#c9d89
    debugOwner: GestureDetector
    state: possible
    won arena
    finalPosition: Offset(246.8, 613.3)
    finalLocalPosition: Offset(246.8, 23.3)
    button: 1
    sent tap down

我做错了吗？

标签： flutterdart

解决方案

═══════ 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

该错误仅仅是因为您试图从null File.

在调用下一个代码之前，您需要检查文件是否为空：

 if (pickedImage == null) {
   // File is null, probably not found or incorrect path.
   return;
 }

 // Do something with the file
 if (pickedImage.path == null) {

 }

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