英文:
The parameter 'chatmessage' can't have a value of 'null' because of its type, but the implicit default value is 'null'
问题
以下是翻译好的内容：
"chatmessage" 参数不能为 "null"，因为它的类型要求，但隐式默认值为 "null"。
尝试添加一个明确的非 "null" 默认值。
我的代码如下：
messageImageBuilder: (url, [chatmessage]) => Container(
height: 200,
width: 200,
child: PhotoView(
imageProvider: NetworkImage(url!),
),
),
英文:
I am currently using the dash_chat package to implement chat functionality in my app, but facing this issue:
The parameter 'chatmessage' can't have a value of 'null' because of its type, but the implicit default value is 'null'.
Try adding an explicit non-'null' default value.
My code looks like this:
messageImageBuilder: (url, [chatmessage]) => Container(
height: 200,
width: 200,
child: PhotoView(
imageProvider: NetworkImage(url!),
),
),
答案1
得分: 1
提到参数chatmessage，类型为ChatMessage?。
您的代码应该像这样..
messageImageBuilder: (url, [ChatMessage? chatmessage]) => Container(
height: 200,
width: 200,
child: PhotoView(
imageProvider: NetworkImage(url!),
),
),
英文:
Mention the parameter chatmessage with type ChatMessage?.
Your code should be like..
messageImageBuilder: (url, [ChatMessage? chatmessage]) => Container(
height: 200,
width: 200,
child: PhotoView(
imageProvider: NetworkImage(url!),
),
),
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