LeanbackShowcase/app/src/main/java/androidx/leanback/leanbackshowcase/cards/presenters/IconCardInChannelPublishPresenter.java [40:59]:
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    @Override
    protected ImageCardView onCreateView() {
        final ImageCardView imageCardView = super.onCreateView();
        final ImageView image = imageCardView.getMainImageView();
        image.setBackgroundResource(R.drawable.icon_focused);
        image.getBackground().setAlpha(0);
        imageCardView.setOnFocusChangeListener(new View.OnFocusChangeListener() {
            @Override
            public void onFocusChange(View v, boolean hasFocus) {
                animateIconBackground(image.getBackground(), hasFocus);
            }
        });
        return imageCardView;
    }

    private void animateIconBackground(Drawable drawable, boolean hasFocus) {
        if (hasFocus) {
            ObjectAnimator.ofInt(drawable, "alpha", 0, 255).setDuration(ANIMATION_DURATION).start();
        } else {
            ObjectAnimator.ofInt(drawable, "alpha", 255, 0).setDuration(ANIMATION_DURATION).start();
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LeanbackShowcase/app/src/main/java/androidx/leanback/leanbackshowcase/cards/presenters/IconCardPresenter.java [37:56]:
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    @Override
    protected ImageCardView onCreateView() {
        final ImageCardView imageCardView = super.onCreateView();
        final ImageView image = imageCardView.getMainImageView();
        image.setBackgroundResource(R.drawable.icon_focused);
        image.getBackground().setAlpha(0);
        imageCardView.setOnFocusChangeListener(new View.OnFocusChangeListener() {
            @Override
            public void onFocusChange(View v, boolean hasFocus) {
                animateIconBackground(image.getBackground(), hasFocus);
            }
        });
        return imageCardView;
    }

    private void animateIconBackground(Drawable drawable, boolean hasFocus) {
        if (hasFocus) {
            ObjectAnimator.ofInt(drawable, "alpha", 0, 255).setDuration(ANIMATION_DURATION).start();
        } else {
            ObjectAnimator.ofInt(drawable, "alpha", 255, 0).setDuration(ANIMATION_DURATION).start();
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