android - 一个不太理解的问题，继承BaseAdapter在getView方法中获取一个布局的实例，却为空指针

Question

代码文件：

布局文件：

真是被搞@_@了

ViewHolder类：

Answer 1

Your statement block should not be empty, so a null pointer error will be reported. moduels.tradeModelLabel,而是setText中的内容。
如果moduels.tradeModelLabel为空，上面的if-else

Answer 2

If this kind of inexplicable problem occurs, clean or rebuild the project first. Sometimes android studio will miss some codes when compiling..

Answer 3

Change your first judgment to tradeModelString == null If tradeModelString is null
This sentence will report a null pointer