How to create android spinner without down triangle on the right side of the widget

Question

I have a screen where the user has many items to input so screen space is at a premium.

I want the look of the widget on the screen (before the user presses it) t

Answer 1

I just arrived to this question, because my spinner was not showing the triangle indicator, now I understand why: I was setting the background to "white":

android:background="#FFFFFFFF"

This removes the triangle indicator (the spinner background image and padding stated by Aleadam).

For my problem, I solve it adding a parent LinearLayout just to set the background to "white".