Unity Vuforia 动态替换识别图

1.在Unity里 Vuforia 用来做识别信息的是 StreamingAssets 下 Vuforia文件夹内的 Dat和XML 文件。

2.想要替换识别图需要在Vuforia官网里替换识别图 （这里替换的识别图名字要和之前的识别图名字一样），
　　替换完成后直接下载所有文件 选择Android文件 直接获取 Dat和XML文件，然后把这俩文件传至服务器

3.在打包之后，每次打开应用的时候做更新检查，如果有更新就去服务器下载这俩文件替换掉原来的文件（Android包 没法用IO读取
　　StreamingAssets下的文件， 直接用UnityWebReques 替换就行）

2.之前的理解有问题，其实不是替换原先的Dat和XML文件， 是重新下载新的Dat和XML 文件 通过代码的方式动态

加载识别图，达到替换的目的，默认的加载顺序是上传到Vuforia里的顺序

这是一个大概思路后续等我写完，会贴上代码

我是把这个代码放在ARCamera 上的， 打开应用下载完Dat和XML 以后，加载ARCamera 顺带着就初始化了识别图信息。目前使用下来没什么问题，就是注意它默认加载顺序（这个顺序是固定的）

using System;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using UnityEngine;
using UnityEngine.UI;
using Vuforia;
using QFramework;
/// <summary>
/// 识别图管理器
/// </summary>
public class ImageTargetManager : MonoSingleton<ImageTargetManager>
{
    //public Text logtest;

    //public Text errortext;
  //  public List<GameObject> listShowObj;
    /// <summary>
    /// 识别图加载完成
    /// </summary>
    public event Action<string[]> ImageTargerLoadedEvent;

    /// <summary>
    /// 本地文件路径
    /// </summary>
    private string m_localFilePath;
    /// <summary>
    /// 是否加载过
    /// </summary>
    private bool m_isLoaded;
    /// <summary>
    /// 数据集
    /// </summary>
    private DataSet m_dataSet = null;
    /// <summary>
    /// 识别器
    /// </summary>
    private ObjectTracker m_tracker;
    /// <summary>
    /// 识别图集合对象
    /// </summary>
    private ImageTargetBehaviour[] m_imageTargetBehaviours;

    private void Start()
    {
      //  Debug.Log(" Inited  " + m_isLoaded);
        m_isLoaded = false;
        //TODO  识别图相关信息加载
        //VuforiaBehaviour.Instance.RegisterVuforiaInitializedCallback(VuforiaInitedCallBack);

        try
        {
            VuforiaARController.Instance.RegisterVuforiaInitializedCallback(VuforiaInitedCallBack);
            VuforiaARController.Instance.RegisterVuforiaStartedCallback(VuforiaStaredtCallBack);
        }
        catch (Exception e)
        {

          //  errortext.text = e.Message;
        }
    }
    /// <summary>
    /// 高通初始化完毕回调
    /// </summary>
    void VuforiaInitedCallBack()
    {
        m_localFilePath = Application.persistentDataPath + "/StreamingAssets/Vuforia/" + AppConfigConst.IMAGE_TARGET_FILE_NAME + ".xml";

        Debug.Log( " Inited@@@  "+m_localFilePath+"  " +File.Exists(m_localFilePath));
        //logtest.text = " Inited@@@  " + m_localFilePath + "  " + File.Exists(m_localFilePath);
        if (File.Exists(m_localFilePath))
        {
            //Load Local
            StartCoroutine(LoadLocalFile());
        }
        else
        {
            //Load NetWork
            //StartCoroutine(LoadNetworkFile());
        }
    }

    void VuforiaStaredtCallBack()
    {
        CameraDevice.Instance.SetFocusMode(CameraDevice.FocusMode.FOCUS_MODE_CONTINUOUSAUTO);
    //  errortext.text =    CameraDevice.Instance.SetFocusMode(CameraDevice.FocusMode.FOCUS_MODE_CONTINUOUSAUTO).ToString();  //auto focus
    }

    /// <summary>
    /// 加载网络配置文件
    /// </summary>
    /// <returns></returns>
    private IEnumerator LoadNetworkFile()
    {
        WWW wwwdat = new WWW(AppConfigConst.IMAGE_TARGET_FILE_PATH + AppConfigConst.IMAGE_TARGET_FILE_NAME + ".dat");
        yield return wwwdat;

        Debug.Log(wwwdat.url);
        WWW wwwxml = new WWW(AppConfigConst.IMAGE_TARGET_FILE_PATH + AppConfigConst.IMAGE_TARGET_FILE_NAME + ".xml");
        yield return wwwxml;

        File.WriteAllBytes(Application.persistentDataPath + "/" + AppConfigConst.IMAGE_TARGET_FILE_NAME + ".dat", wwwdat.bytes);
        File.WriteAllBytes(Application.persistentDataPath + "/" + AppConfigConst.IMAGE_TARGET_FILE_NAME + ".xml", wwwxml.bytes);
        StartCoroutine(LoadLocalFile());
    }

    /// <summary>
    /// 加载本地配置文件
    /// </summary>
    /// <returns></returns>
    IEnumerator LoadLocalFile()
    {
        bool isVuforiaEnabled = VuforiaRuntimeUtilities.IsVuforiaEnabled();
        Debug.Log(isVuforiaEnabled);
       // logtest.text = "isVuforiaEnabled   " + isVuforiaEnabled + "  m_isLoaded " + m_isLoaded;
        if (isVuforiaEnabled && m_isLoaded == false)
        {
            if (m_dataSet == null)
            {
                m_tracker = TrackerManager.Instance.GetTracker<ObjectTracker>();
                m_dataSet = m_tracker.CreateDataSet();
            }

            Debug.Log("LoadData " + m_localFilePath);
         //   logtest.text = "LoadData " + m_localFilePath;
            ObjectTracker objectTracker = TrackerManager.Instance.GetTracker<ObjectTracker>();
            objectTracker.Stop();
            if (m_dataSet.Load(m_localFilePath, VuforiaUnity.StorageType.STORAGE_ABSOLUTE))
            {
                Debug.Log("LoadData OVer " + m_localFilePath);
         //       logtest.text = "LoadData OVer " + m_localFilePath;

                m_isLoaded = true;
                m_tracker.ActivateDataSet(m_dataSet);
                //   errortext.text =  m_tracker.ActivateDataSet(m_dataSet).ToString();

                objectTracker.Start();
                UpdateImageTarget();

            }
            else
            {
                m_isLoaded = false;
            }
        }
        WWW www = new WWW("file:///" + m_localFilePath);
        yield return www;
    }

    /// <summary>
    /// 修改Imagetarget 的名称
    /// </summary>
    void UpdateImageTarget()
    {
        List<string> imagetargetNameList = new List<string>();
        m_imageTargetBehaviours = FindObjectsOfType<ImageTargetBehaviour>();
      //  logtest.text = m_imageTargetBehaviours.Length.ToString();
        for (int i = 0; i < m_imageTargetBehaviours.Length; i++)
        {
            ImageTargetBehaviour imageTargetBehaviour = m_imageTargetBehaviours[i];
       //     logtest.text = logtest.text+"  "+ m_imageTargetBehaviours[i].name;
            imageTargetBehaviour.name = "ImageTarget_" + imageTargetBehaviour.ImageTarget.Name;

            //imageTargetBehaviour.gameObject.AddComponent<DefaultTrackableEventHandler>();

            //读取 DefaultTrackableEventHandler.lua
            imageTargetBehaviour.gameObject.AddComponent<DefaultTrackableEventHandler>();
          //  imageTargetBehaviour.gameObject.AddComponent<LuaTrackableEventHandler>();
            imageTargetBehaviour.gameObject.AddComponent<TurnOffBehaviour>();
            imageTargetBehaviour.gameObject.AddComponent<VuforialFindImageAction>();
            imagetargetNameList.Add(imageTargetBehaviour.name);

            //listShowObj[i].transform.parent = imageTargetBehaviour.transform;
            //listShowObj[i].transform.localPosition = Vector3.zero;
            VuforialFindImageAction imageaction = imageTargetBehaviour.gameObject.GetComponent<VuforialFindImageAction>();
            GameObject obj = new GameObject("Cube");
            obj.transform.parent = imageaction.transform;
            obj.transform.localEulerAngles = new Vector3(90, 0, 0);
            obj.transform.localPosition = Vector3.zero;

            imageaction.num = i;
            imageaction.targetObj = obj.transform;
            imageaction.pointObj = 0;

        }

       OnImageTargerLoadedEvent(imagetargetNameList.ToArray());
    }

    /// <summary>
    /// 获取所有的识别图对象
    /// </summary>
    /// <returns></returns>
    public ImageTargetBehaviour[] GetImageTargetBehaviours()
    {
        return m_imageTargetBehaviours;
    }

    protected virtual void OnImageTargerLoadedEvent(string[] obj)
    {
        var handler = ImageTargerLoadedEvent;
        if (handler != null)
        {
            handler(obj);
        }
    }
}