Android putExtra cannot resolve symbol

Question

I'm trying to transfer a string from one activity to another in android. I'm working off of this answer: How to use putExtra() and getExtra() for string data

However, I think I'm doing something really basic incorrectly. When I type " i.putExtra " I get the error "cannot resolve putExtra." Do I need to import something to use putExtra ?

In the documentation for putExtra it seems that I should be able to use it as long as I've imported android.content .Intent, which I have.

Answer 1

您必须将代码放入OnCreate()语句中。