'What does "this" mean for ViewPagers?

I am making a page listener, I've seen a view people do this:

ViewPager.addOnPageChangeListener(this);

What does that mean? What does that code even do, seems like nothing? I thought "this" meant the current Activity or context but I feel like the above code is not doing anything.

javaandroidandroid-studioandroid-viewpager


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