java - Why nextLine is being skipped when using do while loop

I have to write a program for my class that takes user
input for homework,labs,tests,etc,puts them in a string, and there is a separate class
that splits them in separate "double"numbers and contains a writeToFile method to write
the student's grade into a file.

I keep getting
a problem though.. When I ask the user for their name the first time, it works fine, but
if the user decides to enter the do-while loop again, the "What is your name" is skipped
and it goes straight to id. I know it has something to do with the last input not being
a string, and the solution to that is to put a "keyboard.nextLine();" above the
question, but I tried that and it just asks the user for their name before the question
is even asked..

import
            java.util.Scanner; 

 import java.io.*;
 import
            java.text.DecimalFormat;

 public class GradeApplication

            {
 public static void main(String[] args) throws IOException 

            {
 Scanner keyboard = new Scanner(System.in);

 //Define
            variables

 String name;
 int id;
 String
            homework;
 String labs;
 String tests;
 double
            project;
 double discussion;
 int answer;


            do

 {
 System.out.print("\nWhat is your name?
            ");
 name=keyboard.nextLine();

 System.out.print("\nWhat
            is your student ID? ");
 id=keyboard.nextInt();

 homework
            = keyboard.nextLine();
 System.out.println("\nPlease enter homework grades
            separated by spaces:");
 homework =
            keyboard.nextLine();


 System.out.println("Please enter
            lab grades separated by spaces:");
 labs =
            keyboard.nextLine();

 System.out.println("Please enter test grades
            separated by spaces:");
 tests = keyboard.nextLine();


            System.out.println("Please enter project grade:");
 project =
            keyboard.nextDouble();


 System.out.println("Please enter
            discussion grade:");
 discussion =
            keyboard.nextDouble();

 System.out.println("\nResults:
            ");
 //Call toString method
 Student_Khazma s = new
            Student_Khazma(name,id,homework,labs,tests,project,discussion);

            System.out.print(s.toString()); 

 //Open file 

            PrintWriter outputFile= new PrintWriter("gradeReport.txt");


            System.out.println(s.writeToFile());

            outputFile.close();

 System.out.print("\n\nWould you like to see
            your grade report again? (1 is yes, 2 is no): ");

            answer=keyboard.nextInt();

 System.out.print("\n\nWould you like to
            see your grade report again? (1 is yes, 2 is no): ");

            answer=keyboard.nextInt();


            }while(answer==1);


 }

            }