Copy the rules of RelativeLayout.LayoutParams before API 19

Question

Im trying to copy RelativeLayout.LayoutParams, and i need the new Params to be exactly like the old ones. So consider this method:

private RelativeLayout.LayoutParams copyParams(RelativeLayout.LayoutParams source){
    RelativeLayout.LayoutParams copy = new RelativeLayout.LayoutParams((RelativeLayout.LayoutParams)source);
    return copy;
}

Now, this works all right, but it will only compile above API-Level 19, as eclipse conveniently tells me.
To make this work pre-API-19, i tried this:

private RelativeLayout.LayoutParams copyParams(RelativeLayout.LayoutParams source){
    RelativeLayout.LayoutParams copy = new RelativeLayout.LayoutParams((ViewGroup.LayoutParams)source);
    copy.setMargins(source.leftMargin, source.topMargin, source.rightMargin, source.bottomMargin);
    return copy;
}

By casting to ViewGroup.LayoutParams, i can force the use of the ViewGroup.LayoutParams CopyConstructor. It is readily available, but it will only copy the height and width. So i need to transfer the margins myself, which i do in line 3 of example 2. But this still leaves out the rules in the source layout, like RelativeLayout.BELOW, for example.

I can't find a copyRules() or setRules() method (or anything equivalent) anywhere in the docs, but i can see the addRule() method of RelativeLayout.LayoutParams. Considering that source.getRules() returns an Array i think i could loop over that and add each rule to my new LayoutParams, but that feels like im doing it wrong. Is there a sane way to copy these rules?

TL;DR: Before API 19, is there a way to copy the rules of RelativeLayout.LayoutParams wholesale, and if not, what is the least insane way to copy them at all?

Answer 1

well, if clone didn't work, probably your last resort will be a good ol' fashioned for-loop uh.

use getRules() to get the list of rules in the current LayoutParams and addRule(int, int) to add them to a new LayoutParam.

old answer:

In this case I would try .clone.

LayoutParams in general are very simple objects with just a few integers, so .clone should handle it nicely.

original answer:

try:

RelativeLayout.LayoutParams copy = new RelativeLayout.LayoutParams((ViewGroup.LayoutParams)source);

the constructor with ViewGroup.LayoutParams exist since API 1.

ps.: Even thou I know it will compile, I strongly suggest you to double check that all the parameters were properly copied over (not just with, height n margins)