How give Field accessable permission as Editable in pagelayouts Using metadata api? about apex-mdapi HOT 7 CLOSED

      How to assign layoutsections and layoutcolumns without null?

    // Add a new section, new column and new layout item for the field
    if(layout.layoutSections==null)
        layout.layoutSections = new List<MetadataService.LayoutSection>();
    MetadataService.LayoutSection newLayoutSection = new MetadataService.LayoutSection();
    MetadataService.LayoutColumn newLayoutColumn = new MetadataService.LayoutColumn();
    MetadataService.LayoutItem newLayoutItem = new MetadataService.LayoutItem();
    newLayoutItem.field = 'TestField__c';
    newLayoutColumn.layoutItems = new List<MetadataService.LayoutItem> { newLayoutItem }; 
    newLayoutSection.layoutColumns = new List<MetadataService.LayoutColumn> { newLayoutColumn };        
    layout.layoutSections.add(newLayoutSection);        

       MetadataService.MetadataPort service = createService();

      List<MetadataService.Metadata> myCustomlayoutList = new List<MetadataService.Metadata>();
       // Read the Layout
    MetadataService.Layout layout =
    (MetadataService.Layout) service.readMetadata('Layout',
    new String[] { 'rajesh__+ strFieldName+__c-strFieldName Layout' }).getRecords()[0];
    if(layout.layoutSections==null)
   { layout.layoutSections = new List<MetadataService.LayoutSection>();
MetadataService.LayoutSection newLayoutSection = new MetadataService.LayoutSection();
MetadataService.LayoutColumn newLayoutColumn = new MetadataService.LayoutColumn();
MetadataService.LayoutItem newLayoutItem = new MetadataService.LayoutItem();
newLayoutItem.field = 'rajesh__'+ strFieldName+'__c.'+Field2+'__c';
newLayoutColumn.layoutItems = new List<MetadataService.LayoutItem> { newLayoutItem }; 
newLayoutSection.layoutColumns = new List<MetadataService.LayoutColumn> { newLayoutColumn };        
layout.layoutSections.add(newLayoutSection);  

   } 
    // Here add your field by finding or adding the layout section and columns etc…
   MetadataService.LayoutItem LayoutItem = new MetadataService.LayoutItem();
    LayoutItem.field = 'rajesh__'+ strFieldName+'__c.'+Field2+'__c';
    // This code assumes the first section, first column of the layout
 layout.layoutSections[0]. layoutColumns[0].layoutItems.add(LayoutItem);

    // Update the Layout
    handleSaveResults(
    service.updateMetadata(
    new MetadataService.Metadata[] { layout })[0]);

}