/// <summary>
/// 异步下载需要更新的资源
/// </summary>
/// <param name="ev">下载完成回调函数</param>
/// <returns></returns>
IEnumerator AsyncDownloading(ProcessCompleteEvent ev)
{
mTotalDownloadBytes = 0;
mCurrentDownloadIdx = 0;
mAlreadyDownloadBytes = 0;
foreach (var v in mDownloadingList)
{
mTotalDownloadBytes += v.m_FileSize;
}
foreach (var v in mDownloadingList)
{
string url = mHttpAddress + ResUtils.GetBundleManifestName(Application.platform) + "/" + v.m_Name;
UnityEngine.Debug.LogFormat("downloading {0} size {1}", v.m_Name, v.m_FileSize);
WWW www = new WWW(url);
mWWW = www;
yield return(www);
if (www.error == null)
{
string fileName = ResUtils.BundleRootPath + v.m_Name;
string dir = fileName.Substring(0, fileName.LastIndexOf('/'));
Directory.CreateDirectory(dir);
File.WriteAllBytes(fileName, www.bytes);
}
else
{
UnityEngine.Debug.LogErrorFormat("downloading {0} error {1}", v.m_Name, www.error);
}
mAlreadyDownloadBytes += v.m_FileSize;
mCurrentDownloadIdx++;
}
//全部下载成功后，再覆盖写入索引文件
Directory.CreateDirectory(ResUtils.BundleRootPath);
if (mNewIndexContent != null)
{
File.WriteAllText(ResUtils.BundleRootPath + ResUtils.BundleIndexFileName, mNewIndexContent);
mNewIndexContent = null;
}
ev?.Invoke();
yield return(null);
}
/// <summary>
/// 从服务器得到资源列表并对比出需要更新的包列表
/// </summary>
/// <param name="ev">检查完成后回调函数</param>
/// <returns></returns>
IEnumerator AsyncCheckDownloadingList(ProcessCompleteEvent ev)
{
//读取本地的idx和apk里的idx文件
Dictionary <string, BundleItem> localBundlesDict = new Dictionary <string, BundleItem>();
string localIndexPath = ResUtils.BundleRootPath + ResUtils.BundleIndexFileName;
if (!File.Exists(localIndexPath)) //如果P目录里没有索引文件，去Resources里拷贝一份到P目录
{
UnityEngine.Debug.Log("local idx not found, try copy from default");
Directory.CreateDirectory(ResUtils.BundleRootPath);
var txt = Resources.Load(ResUtils.BundleIndexFileName.Substring(ResUtils.BundleIndexFileName.IndexOf('.'))) as TextAsset;
if (txt != null)
{
File.WriteAllText(ResUtils.BundleRootPath + ResUtils.BundleIndexFileName, txt.text);
}
}
if (File.Exists(localIndexPath))
{
string indexContent = File.ReadAllText(localIndexPath);
if (indexContent != null)
{
IdxFile file = new IdxFile();
List <BundleItem> list = file.Load(indexContent);
foreach (var v in list)
{
localBundlesDict[v.m_Name] = v;
}
}
}
else
{
UnityEngine.Debug.LogWarning("local idx not found");
}
//下载网上的idx文件
WWW www = new WWW(mHttpAddress + ResUtils.GetBundleManifestName(Application.platform) + "/" + ResUtils.BundleIndexFileName);
yield return(www);
if (www.error != null)
{
UnityEngine.Debug.Log("remote idx read error " + www.error);
}
mDownloadingList.Clear();
if (www.error == null)
{
mNewIndexContent = www.text;
IdxFile file = new IdxFile();
List <BundleItem> listServer = file.Load(mNewIndexContent);
foreach (var v in listServer)
{
string localHash = null;
string netHash = v.m_HashCode;
BundleItem localItem = null;
if (localBundlesDict.TryGetValue(v.m_Name, out localItem))
{
localHash = localItem.m_HashCode;
}
if (localHash != netHash)
{
mDownloadingList.Add(v); //网上的资源较新则需要重新下载到本地
}
}
UnityEngine.Debug.LogFormat("download idx file success! new bundles count {0}, downloading {1}", listServer.Count, mDownloadingList.Count);
}
else
{
UnityEngine.Debug.LogFormat("download idx file error! {0}", www.error);
}
ev?.Invoke();
yield return(null);
}
/// <summary>
/// 从AB包里加载资源
/// </summary>
/// <param name="assetPath">资源路径，例如 subdir/res1.prefab </param>
/// <param name="type">资源类型</param>
/// <returns>加载好的资源对象</returns>
private UnityEngine.Object LoadAssetFromBundle(string assetPath, Type type)
{
//检查依赖关系是否加载，如果没有则加载
if (mAssetBundleManifest == null)
{
AssetBundle manifestBundle = AssetBundle.LoadFromFile(ResUtils.BundleRootPath + ResUtils.GetBundleManifestName(Application.platform));
if (manifestBundle == null)
{
return(null);
}
mAssetBundleManifest = manifestBundle.LoadAsset("AssetBundleManifest", typeof(AssetBundleManifest)) as AssetBundleManifest;
if (mAssetBundleManifest == null)
{
return(null);
}
}
//获取资源在包内部的名字，这个名字没有路径，但有扩展名，例如 res1.prefab
string assetName = assetPath.Substring(assetPath.LastIndexOf("/") + 1).ToLower();
//得到bundle文件的相对路径名，例如 subdir/res1.prefab.unity3d
string bundleFileName = assetPath + '.' + ResUtils.BundleExtension;
AssetBundleInfo bundleInfo = null;
if (mLoadedAssetBundles.TryGetValue(bundleFileName, out bundleInfo))
{
bundleInfo.mReferencedCount++;
if (!bundleInfo.mAssetBundle.isStreamedSceneAssetBundle)
{
UnityEngine.Object obj = bundleInfo.mAssetBundle.LoadAsset(assetName, type);
return(obj);
}
else
{
return(null); //场景包不需要加载资源，返回即可
}
}
else
{
LoadDependencies(bundleFileName);
bundleInfo = LoadAssetBundleSingle(bundleFileName);
if (bundleInfo != null && !bundleInfo.mAssetBundle.isStreamedSceneAssetBundle)
{
UnityEngine.Object obj = bundleInfo.mAssetBundle.LoadAsset(assetName, type);
return(obj);
}
else
{
return(null); //场景包不需要加载资源，返回即可
}
}
}
