Unity实现手机摇一摇震动

using UnityEngine;
using System.Collections;
 
public class FunctionVibrate : MonoBehaviour
{
 //实现手机晃动震动效果
 // Use this for initialization
 float old_y = 0;
 float new_y;
 float max_y = 0;
 float min_y = 0;
 float d_y = 0;
 public float distance = 0.3f;
 void Start () {
 
 }
 
 // Update is called once per frame
 void Update () {
 
 new_y = Input.acceleration.y;
 d_y = new_y - old_y;
 old_y = new_y;
 if(Input.GetKey(KeyCode.Escape))
 {
  Application.Quit();
 }
 }
 int i;
 void OnGUI() 
 {
 //if(GUI.Button(new Rect(0,100,100,32),"vibrate!"))
 //{
 // //震动
 // Handheld.Vibrate();
 //}
 GUI.Label(new Rect(100,100,100,100),"g:"+Input.acceleration+"d_y:"+d_y);
 GUI.Label(new Rect(100,200,100,100),"i:"+i);
 if(d_y>distance)
 {
  i++;
  Handheld.Vibrate();
 }
 }
}