PopupWindow background sometimes gets transparent and purple

Question

Here's how I create a PopupWindow:

private static PopupWindow createPopup(FragmentActivity activity, View view)
{
    PopupWindow popup = new PopupWindow(view, ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT, true);
    popup.setOutsideTouchable(true);
    popup.setFocusable(true);
    popup.setBackgroundDrawable(new ColorDrawable(Tools.getThemeReference(activity, R.attr.main_background_color)));
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP)
        popup.setElevation(Tools.convertDpToPixel(8, activity));
    PopupWindowCompat.setOverlapAnchor(popup, true);

    return popup;
}

main_background_color is a solid color, white or black, depending on the theme. Sometimes following happens:

How can I avoid this? It happens in the emulator with android 6 SOMETIMES only for example... Normally, the PopupWindow background works as expected though...

Edit

Additionally, here's my getThemeReference method:

public static int getThemeReference(Context context, int attribute)
{
    TypedValue typeValue = new TypedValue();
    context.getTheme().resolveAttribute(attribute, typeValue, false);
    if (typeValue.type == TypedValue.TYPE_REFERENCE)
    {
        int ref = typeValue.data;
        return ref;
    }
    else
    {
        return -1;
    }
}

EDIT 2 - this may solve the problem: using getThemeColor instead of getThemeReference

public static int getThemeColor(Context context, int attribute)
{
    TypedValue typeValue = new TypedValue();
    context.getTheme().resolveAttribute(attribute, typeValue, true);
    if (typeValue.type >= TypedValue.TYPE_FIRST_COLOR_INT && typeValue.type <= TypedValue.TYPE_LAST_COLOR_INT)
    {
        int color = typeValue.data;
        return color;
    }
    else
    {
        return -1;
    }
}

Answer 1

Thanks for the update, I asked you to show the method because I actually use the same kind of thing in my apps to retrieve color attributes, but our methods are a bit different.

Here is mine:

public static int getThemeColor(Context context, int attributeId) {
    TypedValue typedValue = new TypedValue();

    TypedArray a = context.obtainStyledAttributes(typedValue.data, new int[] { attributeId });
    int color = a.getColor(0, 0);

    a.recycle();

    return color;
}

Even though I can't be sure it is indeed the problem, there is something wrong with your comments. The call new ColorDrawable() is expecting a color, not a reference. I sometimes also did this mistake in the past and also got weird colors, because the system was trying to generate a color with a reference ID. Have you tried a real color like red to see if your method really works?

I would replace anyway your method with mine because it guarantees you to retrieve a color.