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();
  }
 }
}