unity 加载视频可以后台替换

using System.Collections;
using System.Collections.Generic;
using System.IO;
using UnityEngine;
using UnityEngine.UI;
using UnityEngine.Video;

public class Main : MonoBehaviour
{
    public GameObject allBtn;
    public RawImage vidIamge;
    public VideoPlayer vidPlay;
    private List<VideoClip> vidClips = new List<VideoClip>();
    private string filePath;
    private FileInfo[] files;


    void Start() {
        vidIamge.gameObject.SetActive(false);
        vidPlay.targetTexture.Release();
        filePath = Application.dataPath + "/vid";
        if (Directory.Exists(filePath)) {//判断这个路径是否存在
            DirectoryInfo direction = new DirectoryInfo(filePath);
            files = direction.GetFiles("*.mp4", SearchOption.AllDirectories);
        }
        for(int i = 0; i < allBtn.transform.childCount; i++) {
            Button btn = allBtn.transform.GetChild(i).GetComponent<Button>();
            EventTriggerListener.Get(btn.gameObject).onClick = onBtn;
        }
        EventTriggerListener.Get(vidIamge.gameObject).onClick = onVidIage;
    }

    void onBtn(GameObject sender) {
        vidIamge.gameObject.SetActive(true);
        for (int i = 0; i < allBtn.transform.childCount; i++) {
            if (sender.name == allBtn.transform.GetChild(i).name) {
                string strURL= "file://" + filePath + "/" + files[i].Name;
                vidPlay.url = strURL;
            }
        }
      
    }
    void onVidIage(GameObject sender) {
        vidPlay.Stop();
        vidPlay.targetTexture.Release();
        vidIamge.gameObject.SetActive(false);
    }
}