Dynamically Querying PickList for Standdard and Custom Field in Apex

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You can refer below sample example in order to get an idea.
VF
--------------------------
<apex:page Controller="DynamicPickListCtrl">
    <apex:form >
        <apex:pageMessages />
        <apex:pageBlock >
            <apex:pageBlockSection columns="2">
                <apex:pageblockSectionItem >
                    <apex:outputLabel value="SLA"/>
                </apex:pageblockSectionItem>
                <apex:pageblockSectionItem >
                    <apex:selectList value="{!SLA}" size="1" >
                        <apex:selectOptions value="{!slaOptiions}"/>
                    </apex:selectList>
                </apex:pageblockSectionItem>
            </apex:pageBlockSection>
        </apex:pageBlock>
    </apex:form>
</apex:page>
----------------------

Controller
--------------------------------
public class DynamicPickListCtrl {
 public String SLA {
  get;
  set;
 }

 public DynamicPickListCtrl() {

 }

 public List < SelectOption > getslaOptiions() {
  List < SelectOption > options = new List < SelectOption > ();
  options.add(new selectOption('None', '--- None ---'));
  Schema.DescribeFieldResult fieldResult = Account.SLA__c.getDescribe();
  List < Schema.picklistEntry > ple = fieldResult.getPicklistValues();
  for (Schema.picklistEntry f: ple) {
   options.add(new selectOption(f.getLabel(), f.getValue()));
  }
  return Options;
 }
}
-----------------------------------

I hope this will help you.


Generic Method for getting pick as List<String>
---------------------------------------------------------------
 public static List < String > getPicklistValues(String ObjectApi_name, String Field_name) {

  List < String > lstPickvals = new List < String > ();
  Schema.SObjectType targetType = Schema.getGlobalDescribe().get(ObjectApi_name); //From the Object Api name retrieving the SObject
  Sobject Object_name = targetType.newSObject();
  Schema.sObjectType sobject_type = Object_name.getSObjectType(); //grab the sobject that was passed
  Schema.DescribeSObjectResult sobject_describe = sobject_type.getDescribe(); //describe the sobject
  Map < String, Schema.SObjectField > field_map = sobject_describe.fields.getMap(); //get a map of fields for the passed sobject
  List < Schema.PicklistEntry > pick_list_values = field_map.get(Field_name).getDescribe().getPickListValues(); //grab the list of picklist values for the passed field on the sobject
  for (Schema.PicklistEntry a: pick_list_values) { //for all values in the picklist list
   lstPickvals.add(a.getValue()); //add the value  to our final list
  }

  return lstPickvals;
 }

 ---------------------------------------------------------------


Generic Method for getting pick as List < SelectOption >
---------------------------------------------------------------
 public static List < SelectOption > getPicklistValues(String ObjectApi_name, String Field_name) {

  List < SelectOption > options = new List < SelectOption > ();
  Schema.SObjectType targetType = Schema.getGlobalDescribe().get(ObjectApi_name); //From the Object Api name retrieving the SObject
  Sobject Object_name = targetType.newSObject();
  Schema.sObjectType sobject_type = Object_name.getSObjectType(); //grab the sobject that was passed
  Schema.DescribeSObjectResult sobject_describe = sobject_type.getDescribe(); //describe the sobject
  Map < String, Schema.SObjectField > field_map = sobject_describe.fields.getMap(); //get a map of fields for the passed sobject
  List < Schema.PicklistEntry > pick_list_values = field_map.get(Field_name).getDescribe().getPickListValues(); //grab the list of picklist values for the passed field on the sobject
  for (Schema.PicklistEntry a: pick_list_values) { //for all values in the picklist list
   options.add(new selectOption(a.getLabel(), a.getValue()));
  }

  return options;

 }

---------------------------------------------------------------

 I hope this will help you.

Have almost 7 years of experience and expertise in Core Java, JDBC, Servlet, JSP, Java Web Services and Struts, Oracle Database, MS SQL Server,Apex,Visual Force,Force.com platform. Good Experience on Oracle CRM ON DEMAND, Sales force CRM with ability to work independently and in a team environment. Good Analytical & Reasoning skills. Strongly creative in learning new technologies and systems, extremely passionate to work in a challenging place. Apart from that, I have very vast experience in integration and data migration from one system to other system. Certifications: 1. Salesforce Certified Platform Developer I 2. Salesforce Certified Administrator 3. Salesforce Certified Sales Cloud Consultant 4. Salesforce Certified Service Cloud Consultant 5. Oracle Certified Java Developer 6.Oracle Certified Web Component Developer 7. Oracle Certified SQL Associate

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