What does "this" mean for ViewPagers?

Issue

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.

Solution

It means it is referring to a onPageChangeListner object which u need to create sepearately. So you will have to create a OnPageChangeListener like this:

ViewPager.OnPageChangeListener()  pageChangeListener = new ViewPager.OnPageChangeListener() {}

And then use it like:

ViewPager.addOnPageChangeListener(this)

So basically this means the reference of the onPageChangeListener object

Answered By - shah