Not exactly an issue but how do I blur the viewpager in the back??

[PembaTamang]

I did this :

switch (adapterType)
            {
                case MainActivity.ADAPTER_TYPE_TOP:
 Glide.with(context)
                    .load(listItems[position])
                    .into(imageCover);
                    linMain.setBackgroundResource(R.drawable.shadow);

                    break;
                case MainActivity.ADAPTER_TYPE_BOTTOM:
 Glide.with(context)
                    .load(listItems[position])
                    .applyDefaultRequestOptions(new RequestOptions().bitmapTransform(new BlurTransformation(20)))
                    .into(imageCover);
                    linMain.setBackgroundResource(0);

                    break;
            }

I realised that its the same image view so the whole thing was being blurred. I made another Adapter inflating another imagview and blurred that, still the entire thing is being blurred. How do I just blur the back imageview???