How to set DialogFragment’s width and height?

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If you convert directly from resources values:

int width = getResources().getDimensionPixelSize(R.dimen.popup_width);
int height = getResources().getDimensionPixelSize(R.dimen.popup_height);        
getDialog().getWindow().setLayout(width, height);

Then specify match_parent in your layout for the dialog:

android:layout_width="match_parent"
android:layout_height="match_parent"

You only have to worry about one place (place it in your DialogFragment#onResume). Its not perfect, but at least it works for having a RelativeLayout as the root of your dialog’s layout file.

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