RecyclerView GridLayoutManager: how to auto-detect span count?

Question

Using the new GridLayoutManager: https://developer.android.com/reference/android/support/v7/widget/GridLayoutManager.html

It takes an explicit span count, so the pro

Answer 1

I extended the RecyclerView and overrode the onMeasure method.

I set an item width(member variable) as early as I can,with a default of 1. This also updates on configuration changed. This will now have as many rows as can fit in portrait,landscape,phone/tablet etc.

@Override
protected void onMeasure(int widthSpec, int heightSpec) {
    super.onMeasure(widthSpec, heightSpec);
    int width = MeasureSpec.getSize(widthSpec);
    if(width != 0){
        int spans = width / mItemWidth;
        if(spans > 0){
            mLayoutManager.setSpanCount(spans);
        }
    }
}