boolean function ( ) { return true ; }
if the position offset of a fragment is less than negative one or greater than one , returning true will set the fragment alpha to 0f . otherwise fragment alpha is always defaulted to 1f . concode_field_sep PlaceHolder placeHolder concode_field_sep void onPostTransform concode_elem_sep void transformPage concode_elem_sep float min concode_elem_sep void onPreTransform concode_elem_sep void onTransform concode_elem_sep boolean isPagingEnabled