Helper.java

//---- Helper.java ---- //
package com.atultiwari.medicalquiz;

/**
 * @author robert.hinds
 *
 */
public class Helper {

    /**
     * This method selects a end game response based on the players score
     * and current difficulty level
     *
     * @param numCorrect - num correct answers
     * @param numRounds - number of questions
     * @param diff - the difficulty level
     * @return String comment
     */
    public static String getResultComment(int numCorrect, int numRounds, int diff)
    {
        String comm="";
        int percentage = calculatePercentage(numCorrect, numRounds);
        switch (diff)
        {
        case Constants.EXTREME :
            if (percentage > 90){
                comm = "You downloaded the Intersect!";
            }else if (percentage >= 80){
                comm="Nicely Done!";
            }else if (percentage >= 60){
                comm="Not too bad..";
            }else if (percentage >= 40){
                comm="Well, don't give up..";
            }else{
                comm="Next time, stay in the car..";
            }
            break;

        default:
            if (percentage > 90){
                comm = "Awesome!";
            }else if (percentage >= 80){
                comm="Nicely Done!";
            }else if (percentage >= 60){
                comm="Not too bad..";
            }else if (percentage >= 40){
                comm="Well, don't give up..";
            }else{
                comm="Next time, stay in the car..";
            }
        }

        return comm;
    }


    /**
     * Method to return an image to use for the end of game screen
     *
     * @param numCorrect - number of correct answers
     * @param numRounds - number of rounds
     * @param diff - difficulty level
     * @return int Image ID
     */
    public static int getResultImage(int numCorrect, int numRounds, int diff){
        //calculate percentage
        int percentage = calculatePercentage(numCorrect, numRounds);

        //work out which image
        if (percentage > 90){
            if (diff == Constants.EXTREME){
                return R.drawable.hard_winner;
            }else{
                return R.drawable.easy_winner;
            }
        }else if (percentage >= 80){
            return R.drawable.prettygood;
        }else if (percentage >= 60){
            return R.drawable.notbad;
        }else if (percentage >= 40){
            return R.drawable.tryagain;
        }else{
            return R.drawable.loser;
        }
    }


    /**
     * Calculate the percentage result based on the number correct and number of questions
     *
     * @param numCorrect - number of questions right
     * @param numRounds - total number of questions
     * @return int percentage correct
     */
    private static int calculatePercentage(int numCorrect, int numRounds) {
        double frac = (double)numCorrect/(double)numRounds;
        int percentage = (int) (frac*100);
        return percentage;
    }
}