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'm posting this just in case someone gets weird column width as in my case.

I'm not able to comment on @s-marks's answer due to my low reputation. I applied his solution solution but I got some weird column width, so I modified checkedColumnWidth function as follows:

private int checkedColumnWidth(Context context, int columnWidth)
{
    if (columnWidth <= 0)
    {
        /* Set default columnWidth value (48dp here). It is better to move this constant
        to static constant on top, but we need context to convert it to dp, so can't really
        do so. */
        columnWidth = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 48,
                context.getResources().getDisplayMetrics());
    }

    else
    {
        columnWidth = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, columnWidth,
                context.getResources().getDisplayMetrics());
    }
    return columnWidth;
}

By converting the given column width into DP fixed the issue.