How to programmatically set the size of an element in dp?

Question

Java

I make a dynamic list of layers with elements inside. How can I programmatically set the size in dp and not in pixels?
Current sizing code:

LinearLayout.LayoutParams etParams = new LinearLayout.LayoutParams(156, 33);

Answer 1

int dip = 25
float px = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dip,  getResources().getDisplayMetrics());

Answer 2

If the size in dp is known in advance, put the value into resources and retrieve as needed.
If not - use Oleg Gamega's solution