For those searching for a solution to the issue of the ripple effect not working on a programmatically created CardView (or in my case custom view which extends CardView) being shown in a RecyclerView, the following worked for me. Basically declaring the XML attributes mentioned in the other answers declaratively in the XML layout file doesn't seem to work for a programmatically created CardView, or one created from a custom layout (even if root view is CardView or merge element is used), so they have to be set programmatically like so:
private class MadeUpCardViewHolder extends RecyclerView.ViewHolder {
private MadeUpCardView cardView;
public MadeUpCardViewHolder(View v){
super(v);
this.cardView = (MadeUpCardView)v;
// Declaring in XML Layout doesn't seem to work in RecyclerViews
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
int[] attrs = new int[]{R.attr.selectableItemBackground};
TypedArray typedArray = context.obtainStyledAttributes(attrs);
int selectableItemBackground = typedArray.getResourceId(0, 0);
typedArray.recycle();
this.cardView.setForeground(context.getDrawable(selectableItemBackground));
this.cardView.setClickable(true);
}
}
}
Where MadeupCardView extends CardView Kudos to this answer for the TypedArray part.