How to make dynamically created ImageView full screen in Android in Viewpager

When I was doing something recently, there was a requirement to fill the screen with the picture that was used to viewpager the carousel, but the problem was that there was always a gap between the imageview and the screen, as shown here:
At that time the first reaction to consider using Layoutparam, but after several attempts to find a solution on the internet, as long as the creation of ImageView, the ImageView attribute ScaleType set to fit_xy then the problem solved, the specific code is as follows: ImageView imageview=new ImageView (context);
Imageview.setscaletype (SCALETYPE.FIT_XY);//Full screen
Then there is no space, just a record of the problem, there is no technology to say.

How to make dynamically created ImageView full screen in Android in Viewpager