ALV using ABAP Classes and Objects

Hi All,
I am trying to print the values in my internal table using ALV, using ABAP classes and objects. Here the title for columns are picked based on the title specified in the data element. I want to set the title of my columns by my own. how to achieve this ?. Please provide me a sample code if possible.
thanks & regards,
Navneeth.K

Hello Navneeth
The following sample report shows how to build and modify a fieldcatalog (routine <b>BUILD_FIELDCATALOG_KNB1</b>).
*& Report  ZUS_SDN_ALVGRID_EVENTS
REPORT  zus_sdn_alvgrid_events.
DATA:
  gd_okcode        TYPE ui_func,
  gt_fcat          TYPE lvc_t_fcat,
  go_docking       TYPE REF TO cl_gui_docking_container,
  go_grid1         TYPE REF TO cl_gui_alv_grid.
DATA:
  gt_knb1          TYPE STANDARD TABLE OF knb1.
PARAMETERS:
  p_bukrs      TYPE bukrs  DEFAULT '2000'  OBLIGATORY.
*       CLASS lcl_eventhandler DEFINITION
CLASS lcl_eventhandler DEFINITION.
  PUBLIC SECTION.
    CLASS-METHODS:
      handle_hotspot_click FOR EVENT hotspot_click OF cl_gui_alv_grid
        IMPORTING
          e_row_id
          e_column_id
          es_row_no
          sender.
ENDCLASS.                    "lcl_eventhandler DEFINITION
*       CLASS lcl_eventhandler IMPLEMENTATION
CLASS lcl_eventhandler IMPLEMENTATION.
  METHOD handle_hotspot_click.
*   define local data
    DATA:
      ls_knb1     TYPE knb1,
      ls_col_id   TYPE lvc_s_col.
    READ TABLE gt_knb1 INTO ls_knb1 INDEX e_row_id-index.
    CHECK ( ls_knb1-kunnr IS NOT INITIAL ).
    CASE e_column_id-fieldname.
      WHEN 'KUNNR'.
        SET PARAMETER ID 'KUN' FIELD ls_knb1-kunnr.
        SET PARAMETER ID 'BUK' FIELD ls_knb1-bukrs.
        CALL TRANSACTION 'XD03' AND SKIP FIRST SCREEN.
      WHEN 'ERNAM'.
*        SET PARAMETER ID 'USR' FIELD ls_knb1-ernam.
*        NOTE: no parameter id available, yet simply show the priciple
        CALL TRANSACTION 'SU01' AND SKIP FIRST SCREEN.
      WHEN OTHERS.
*       do nothing
    ENDCASE.
*   Set active cell to field BUKRS otherwise the focus is still on
*   field KUNNR which will always raise event HOTSPOT_CLICK
    ls_col_id-fieldname = 'BUKRS'.
    CALL METHOD go_grid1->set_current_cell_via_id
      EXPORTING
        is_row_id    = e_row_id
        is_column_id = ls_col_id.
  ENDMETHOD.                    "handle_hotspot_click
ENDCLASS.                    "lcl_eventhandler IMPLEMENTATION
START-OF-SELECTION.
  SELECT        * FROM  knb1 INTO TABLE gt_knb1
         WHERE  bukrs  = p_bukrs.
* Create docking container
  CREATE OBJECT go_docking
    EXPORTING
      parent                      = cl_gui_container=>screen0
      ratio                       = 90
    EXCEPTIONS
      OTHERS                      = 6.
  IF sy-subrc <> 0.
*   MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
*              WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
  ENDIF.
* Create ALV grid
  CREATE OBJECT go_grid1
    EXPORTING
      i_parent          = go_docking
    EXCEPTIONS
      OTHERS            = 5.
  IF sy-subrc <> 0.
*   MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
*              WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
  ENDIF.
* Set event handler
  SET HANDLER:
    lcl_eventhandler=>handle_hotspot_click FOR go_grid1.
* Build fieldcatalog and set hotspot for field KUNNR
  PERFORM build_fieldcatalog_knb1.
* Display data
  CALL METHOD go_grid1->set_table_for_first_display
    CHANGING
      it_outtab       = gt_knb1
      it_fieldcatalog = gt_fcat
    EXCEPTIONS
      OTHERS          = 4.
  IF sy-subrc <> 0.
*   MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
*              WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
  ENDIF.
* Link the docking container to the target dynpro
  CALL METHOD go_docking->link
    EXPORTING
      repid                       = syst-repid
      dynnr                       = '0100'
*      CONTAINER                   =
    EXCEPTIONS
      OTHERS                      = 4.
  IF sy-subrc <> 0.
*   MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
*              WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
  ENDIF.
* ok-code field = GD_OKCODE
  CALL SCREEN '0100'.
END-OF-SELECTION.
*&      Module  STATUS_0100  OUTPUT
*       text
MODULE status_0100 OUTPUT.
  SET PF-STATUS 'STATUS_0100'.
*  SET TITLEBAR 'xxx'.
ENDMODULE.                 " STATUS_0100  OUTPUT
*&      Module  USER_COMMAND_0100  INPUT
*       text
MODULE user_command_0100 INPUT.
  CASE gd_okcode.
    WHEN 'BACK' OR
         'END'  OR
         'CANC'.
      SET SCREEN 0. LEAVE SCREEN.
    WHEN OTHERS.
  ENDCASE.
  CLEAR: gd_okcode.
ENDMODULE.                 " USER_COMMAND_0100  INPUT
*&      Form  BUILD_FIELDCATALOG_KNB1
*       text
*  -->  p1        text
*  <--  p2        text
FORM build_fieldcatalog_knb1 .
* define local data
  DATA:
    ls_fcat        TYPE lvc_s_fcat.
  CALL FUNCTION 'LVC_FIELDCATALOG_MERGE'
    EXPORTING
*     I_BUFFER_ACTIVE              =
      i_structure_name             = 'KNB1'
*     I_CLIENT_NEVER_DISPLAY       = 'X'
*     I_BYPASSING_BUFFER           =
*     I_INTERNAL_TABNAME           =
    CHANGING
      ct_fieldcat                  = gt_fcat
    EXCEPTIONS
      inconsistent_interface       = 1
      program_error                = 2
      OTHERS                       = 3.
  IF sy-subrc <> 0.
* MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
*         WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
  ENDIF.
  LOOP AT gt_fcat INTO ls_fcat
          WHERE ( fieldname = 'KUNNR'  OR
                  fieldname = 'ERNAM' ).
    ls_fcat-hotspot = abap_true.
    ls_fcat-scrtext_s  = '<short text>'.  " short text of column
    ls_fcat-scrtext_m = '<medium text>'.  " medium text of column
    ls_fcat-scrtext_l   = '<long text>'.  " longtext text of column
    ls_fcat-tooltip      = '...'.  " ALV control: Tool tip for column header
    ls_fcat-coltext    = '...'.   " ALV control: Column heading
    MODIFY gt_fcat FROM ls_fcat.
  ENDLOOP.
ENDFORM.                    " BUILD_FIELDCATALOG_KNB1
Regards
  Uwe

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