how to get background color from current theme programmatically

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You can get the background color (or Drawable) from the current theme by:

TypedValue a = new TypedValue();
getTheme().resolveAttribute(android.R.attr.windowBackground, a, true);
if (a.isColorType()) {
    // windowBackground is a color
    int color = a.data;
} else {
    // windowBackground is not a color, probably a drawable
    Drawable d = activity.getResources().getDrawable(a.resourceId);
}

isColorType was introduced in API level 29. Before then, you can use the following instead:

if (a.type >= TypedValue.TYPE_FIRST_COLOR_INT && a.type <= TypedValue.TYPE_LAST_COLOR_INT)

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