Android SDK: Converting SeekBar to Value (and back) when the seekers start value is greater than zero

gistfile1.java

   /**
    * The seekbars min value cannot be changed in the sdk. It has to be zero
    * Total = 240seconds represented
    * Start Value = 30 seconds
    * Each interval of the seekbar = 5 seconds.
    * <SeekBar
                        android:id="@+id/settings_seekbar_time_interval"
                        android:layout_span="2"
                        android:minWidth="200dp"
                        android:max="42"
                        android:minHeight="6dip"
                        android:maxHeight="6dip"/>
    * 
    * /
   
   /*
    * These methods can be made more terse. They are deliberately "long hand".
    * /
   
       /**
     * We have a seeker that allows user to select a number of seconds
     * Zero value is 30 (seconds) and then increments 5 per value change
     * This method will convert seconds to the seeker value.
     * @param interval is the value from the seeker.
     * @return The time converted to an int of the seeker value
     */
    private int convertRealSecondsToTimeSeekerValue(int interval) {
       
       int valuePerIncrementOfSeeker = 5;
       int zeroValueOfSeeker = 30;
       
        if(interval > zeroValueOfSeeker) {
            int adjustment = zeroValueOfSeeker - valuePerIncrementOfSeeker;
            return (interval - adjustment) / valuePerIncrementOfSeeker;
        }
        else
            return 0;

    }

    /**
     * We have a seeker that allows user to select a number of seconds
     * Zero value is 30 (seconds) and then increments 5 per value change
     * This method will take the value of the seeker and convert it to our number of seconds.
     * @param seekerValue is the value of the seeker (as just moved by the user)
     * @return The time that the seeker represents
     */
    private int convertTimeSeekerToRealSeconds(int seekerValue) {

        int valuePerIncrementOfSeeker = 5;
        int zeroValueOfSeeker = 30;
        
        if(seekerValue > 0) {
            int adjustment = zeroValueOfSeeker - valuePerIncrementOfSeeker;
            return adjustment + (seekerValue * valuePerIncrementOfSeeker);
        }
        else
            return zeroValueOfSeeker;
    }