static public void assertLeftAligned(View first,View second,int margin){
  int[] xy=new int[2];
  first.getLocationOnScreen(xy);
  int firstLeft=xy[0];
  second.getLocationOnScreen(xy);
  int secondLeft=xy[0];
  assertEquals("views are not left aligned",Math.abs(firstLeft - secondLeft),margin);
}

static public void assertLeftAligned ( View first , View second , int margin ) { int [ ] xy = new int [ 2 ] ; first . getLocationOnScreen ( xy ) ; int firstLeft = xy [ 0 ] ; second . getLocationOnScreen ( xy ) ; int secondLeft = xy [ 0 ] ; assertEquals ( "views are not left aligned" , Math . abs ( firstLeft - secondLeft ) , margin ) ; }
assert that two views are left aligned , that is that their left edges are on the same x location , with respect to the specified margin .
