VibrateIntensityUtil.java

package com.company;

public class VibrateIntensityUtil {

    /**
     * get Intensity (Desired Strength) of Vibrate
     * NOTE: Some device's default value may 0.7f (Tested in Galaxy S6),
     * So you need to give choice to user in some way (RadioButton in Dialog?)
     * <p/>
     * But.. for Palette2? I don't know.
     * <p/>
     * Usage: Just load your Vibrator using getSystemService(Context.VIBRATOR_SERVICE), and vibrate(getVibratorPattern(NORMAL, 50), -1);
     * Warning: This long[] array may take a lot of memory, I recommend using Field Variable or Singleton.
     * <p/>
     * VERY SOFT = 0.1f (40 1), SOFT: 0.3f (20 1), NORMAL: 0.5f(1 1), HARD: 0.7f(1 20), VERY HARD: 0.9f(1 40)
     *
     * @param intensity Desired strength of vibration. There are 5 Options.
     * @param duration  Time to vibrate.
     * @return long[] array of Pattern of Vibrate.
     */
    public static long[] getVibratorPattern(Intensity intensity, long duration) {
        float intensityToLong;
        switch (intensity) {
            case VERYSOFT:
                intensityToLong = 0.1f;
                break;
            case SOFT:
                intensityToLong = 0.3f;
                break;
            case NORMAL:
            default:
                intensityToLong = 0.5f;
                break;
            case HARD:
                intensityToLong = 0.7f;
                break;
            case VERYHARD:
                intensityToLong = 0.9f;
                break;
        }

        return getVibratorPattern(intensityToLong, duration);
    }

    /**
     * get Intensity (Desired Strength) of Vibrate
     * Normal Way, just use getVibratorPattern(Intensity, long) for easy work.
     * if you need deliberate control, use this methods.
     * <p/>
     * Usage: Just load your Vibrator using getSystemService(Context.VIBRATOR_SERVICE), and vibrate(getVibratorPattern(NORMAL, 50), -1);
     * Warning: This long[] array may take a lot of memory, I recommend using Field Variable or Singleton.
     * <p/>
     *
     * @param intensity Float value. Range is 0.0f ~ 1.0f
     * @param duration  Time to vibrate
     * @return long[] array of Pattern of Vibrate
     */
    public static long[] getVibratorPattern(float intensity, long duration) {
        long[] pattern;

        if ((intensity >= 0.0f) && (intensity <= 1.0f)) { // intensity 가 지정된 값을 벗어났는지
            float dutyCycle = Math.abs((intensity * 2.0f) - 1.0f); // Math.abs => 절대값을 구함
            long hWidth = (long) (dutyCycle * (duration - 1)) + 1; // 시간에 따라 진동을 울릴 곳을 표시
            long lWidth = dutyCycle == 1.0f ? 0 : 1; // dutyCycle 가 1이면 0, 나머지의 경우 1

            int pulseCount = (int) (2.0f * (float) (duration / (hWidth + lWidth))); // 구한 값을 기초로 패턴 수 정함
            pattern = new long[pulseCount]; // 배열 생성

            for (int i = 0; i < pulseCount; i++) { // 배열 대입
                pattern[i] = intensity < 0.5f ? (i % 2 == 0 ? hWidth : lWidth) : (i % 2 == 0 ? lWidth : hWidth);
                // 다항 연산자
                // intensity -> 0.5 밑이면, i가 짝수일 경우 hWidth 삽입, 홀수의 경우 lWidth 삽입
                // intensity -> 0.5 이상이면, i가 짝수일 경우 lWidth 삽입, 홀수의 경우 hWidth 삽입
            }

            return pattern; // 리턴
        } else {
            throw new RuntimeException("Abnormal intensity value! check your method"); // 잘못된 값을 던질 경우 오류를 던짐
        }
    }

    public enum Intensity {
        VERYSOFT, SOFT, NORMAL, HARD, VERYHARD
    }
}