Get picklist valid values.

PicklistValues

public static String[] getValidPicklistValues(String object_name, String field_name) {
	String[] values = new String[]{};
	String[] types = new String[]{object_name};
	Schema.DescribeSobjectResult[] results = Schema.describeSObjects(types);
	for(Schema.DescribeSobjectResult res : results) {
		for (Schema.PicklistEntry entry : res.fields.getMap().get(field_name).getDescribe().getPicklistValues()) {
			if (entry.isActive()) {values.add(entry.getValue());}
		}
	}
	return values;
}