How to reduce the delay for action upon item click in Android RecyclerVIew?

Question

I have a RecyclerView and when I click on item it should display an imageSlider with some images(just 2 or 3). Everything works fine but there's a little delay on click, something it takes 2 seconds which is very annoying? How can I fix it?

This is the slider code that load images from an array of bitmaps:

public class ImageAdapter extends PagerAdapter {

    private Context context;
    private ArrayList<Bitmap> bitmaps;

    public ImageAdapter(Context context, ArrayList<Bitmap> bitmaps) {
        this.context = context;
        this.bitmaps = bitmaps;
    }

    @Override
    public int getCount() {
        return bitmaps.size();
    }


    @Override
    public boolean isViewFromObject(@NonNull View view, @NonNull Object o) {
        return view == o;
    }



    @Override
    public void destroyItem(@NonNull ViewGroup container, int position, @NonNull Object object) {
        container.removeView((ImageView) object);
    }

    @NonNull
    @Override
    public Object instantiateItem(@NonNull ViewGroup container, int position) {

        ImageView imageView = new ImageView(context);
        Glide.with(container)
                .asBitmap()
                .centerCrop()
                .load(bitmaps.get(position))
                .into(imageView);

        container.addView(imageView,0);
        return imageView;

    }
}

Answer 1

Bitmap Scaling:

Bitmap bitmap = Bitmap.createScaledBitmap(yourBitmap, 100, 100, false);

Bitmap bitmap = Bitmap.createBitmap(yourBitmap, width, height, Bitmap.Config.ARGB_8888);

Or with Glide:

Glide.with(context).asBitmap().load(yourBitmap).apply(new RequestOptions().placeholder(placeHolderDrawable).error(errorDrawable).override(width, height)).into(yourImageView);