In ALV, how do u get alternate colors in output

For a non OO ALV...
TYPE-POOLS: slis.
DATA: xfield TYPE slis_t_fieldcat_alv,
gs_layout TYPE slis_layout_alv.
In your data structure you have tu put a field for the color, example:
DATA: BEGIN OF xdata OCCURS 1.
DATA: ebeln LIKE ekko-ebeln,
 name1 LIKE lfa1-name1,
 txz01 LIKE ekpo-txz01,
 color_line(4) TYPE c, " <==== this is the color line
END OF xdata.
You have create a form for the layout like this:
FORM init_layout.
gs_layout-info_fieldname = 'COLOR_LINE'. "<==the name of de field of the structure
ENDFORM.
Perform the init_layout in the initialization.
Your call alv function, have to be like this:
CALL FUNCTION 'REUSE_ALV_GRID_DISPLAY'
 EXPORTING
 i_buffer_active = 'X'
 i_callback_program = 'YOUR_PROGRAM'
 i_callback_user_command = 'USER_COMMAND'
 is_layout = gs_layout
 it_fieldcat = xfield[]
 TABLES
 t_outtab = xdata
 EXCEPTIONS
 program_error = 1
 OTHERS = 2.

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