对于参数类型long, null的操作符!=没有定义

I am beginner android developer, and this is my first project. I should have to display selected data from ListView on ViewData.java to ListView on EntryTO.java. First, I get an error nullPointerException. I try to detect where is the problem with if function. and that error appears. "The operator != is undefined for the argument type(s) long, null"I am beginner android developer, and this is my