Assign match_parent as a dimen programmatically

Issue

I'm using dimens.xml file to assign values for different layout sizes(i.e dimens.xml@values, dimens.xml@values-sw600dp).

When trying to set a dimen as wrap_Content or match_parent I'm using the following way:

<resources>
    <item name="match_parent" format="integer" type="dimen">-1</item>
    <dimen name="popup_width">@dimen/match_parent</dimen>
</resources>

and it works perfectly when using this dimen inside the layout xml file, but when trying to use it programmatically like when declaring a popup window:

PopupWindow pw = new PopupWindow(layout, mContext.getResources().getDimension(R.dimen.popup_width),
                ViewGroup.LayoutParams.MATCH_PARENT, true);
pw.showAtLocation(layout, Gravity.CENTER, 40, 0);

it doesn't work at all and it considers like if I passed a -1dp values to it(it performs direct referencing), so the layout is ruined at all.

So how can I declare the match_parent dimen in the dimens.xml file in order to use it efficiently in my code? or how even can I use the current dimen form efficiently in my code?

Solution

I solved my problem using -1.0px for representing match_parent, and -2.0px for representing wrap_content as dp is scaling with different screens density unlike px which is not reacting to different screen densities(and that what I need in my solution):

<dimen name="popup_width">-1.0px</dimen>  <!-- for match_parent -->

<dimen name="popup_height">-2.0px</dimen>  <!-- for wrap_content -->

and then I used it programmatically like:

PopupWindow pw = new PopupWindow(layout, (int)mContext.getResources().getDimension(R.dimen.popup_width),
        (int)mContext.getResources().getDimension(R.dimen.popup_height), true); // notice that they have to be casted as int

Answered By - Muhammed Refaat