android:translationX

added in API Level 11

translation in x of the view. This value is added post-layout to the left property of the view, which is set by its layout.

Ensure to change the minSDKVersion to 11, or greater.

       android:translationX = "15px"

Related Articles:

Resources:

http://developer.android.com/reference/android/view/View.html#attr_android:translationX
http://developer.android.com/reference/android/R.attr.html#translationX