Create Action Plan record through Apex Code

Below is a Sample code on how you can create Action Plan and its pre-requisite
records step-by-step:

Refer Salesforce Action Plan document to know more details about Action Plan.

//Execute below code in anonymous console or as a method

ActionPlanTemplate apt = new ActionPlanTemplate();

apt.Name = 'AP_Teamplate_Apex';

apt.ActionPlanType = 'Industries';

// You can provide any object here for which AP is Supported

apt.TargetEntityType = 'Account';

System.debug('before ActionPlanTemplate insert');

insert apt;

ActionPlanTemplateVersion aptv = [select Id, Status from ActionPlanTemplateVersion where Status = 'Draft' and

ActionPlanTemplateId = :apt.Id]

ActionPlanTemplateItem apti = new ActionPlanTemplateItem();

apti.ActionPlanTemplateVersionId = aptv.Id;

//apti.DisplayOrder = 1;

apti.Name = 'AP_Teamplate_Item_Apex';

apti.ItemEntityType = 'Task';

insert apti;

aptv.Status = 'Draft';

System.debug('before ActionPlanTemplateVersion update');

update aptv;

ActionPlanTemplateItemValue aptiv=new ActionPlanTemplateItemValue();

aptiv.ActionPlanTemplateItemId=apti.id;

aptiv.ItemEntityFieldName='Task.ActivityDate';

aptiv.Name= 'ActivityDate';

aptiv.ValueFormula =' StartDate + 360';

insert aptiv;

aptiv=new ActionPlanTemplateItemValue();

aptiv.ActionPlanTemplateItemId=apti.id;

aptiv.ItemEntityFieldName='Task.Priority';

aptiv.Name= 'Priority';

aptiv.ValueLiteral='Normal';

insert aptiv;

aptiv=new ActionPlanTemplateItemValue();

aptiv.ActionPlanTemplateItemId=apti.id;

aptiv.ItemEntityFieldName='Task.Subject';

aptiv.Name= 'Subject';

aptiv.ValueLiteral='New test task';

insert aptiv;

aptv.Status = 'Final';

System.debug('before ActionPlanTemplateVersion update');

update aptv;

System.debug([select Id, Name, Status from ActionPlanTemplateVersion]);

List<ActionPlanTemplateVersion> tempVerList = [select Id from ActionPlanTemplateVersion where Status = 'Final' limit 1];

System.assertEquals(1, tempVerList.size());

List<Account> accList = [select Id from Account limit 1];

System.assertEquals(1, accList.size());

ActionPlan ap = new ActionPlan();

ap.Name = 'Test AP for Test Coverage';

System.debug('Adding template version id as '+tempVerList.get(0).Id +' ----');

ap.ActionPlanTemplateVersionId = tempVerList.get(0).Id;

ap.ActionPlanType = 'Industries';

ap.TargetId = accList.get(0).Id;

ap.ActionPlanState = 'Not Started';

ap.StartDate = System.today();

System.debug('before ActionPlan insert'+ap + '----------');

insert ap;