Unity一键AssetBundle

 ChuangLi_BuildAB类

    [MenuItem("Build AssetBundle/Taptap/1-Build AssetBundles")]
    public static void BuildABS()
    {
        BuildAssetBundle();
        AssetDatabase.Refresh();
        Debug.Log("BuildABS OK");
        CopyFilesToABsFile();
    }

BuildAssetBundles类

  protected static void BuildAssetBundle()
    {
        Platform pf = GetPlatform();
        //删除增量文件夹 删除备份文件夹
        ClearIncrements(pf);
        ClearTemp(pf);

        CheckPath(pf.abPath);
        //将当前的asset bundle备份一份，
        CopyDirectory(pf.abPath, pf.CopyabPath);

        // 打包assetbundle ，并使用 LZ4 压缩
        BuildPipeline.BuildAssetBundles(pf.abPath, BuildAssetBundleOptions.ChunkBasedCompression | BuildAssetBundleOptions.DeterministicAssetBundle, pf.target);
        CreateSizeFile(pf.abPath);

        //比较最新的asset bundle和备份的assetbundle ,并复制到新的增量文件夹
        CopyChangeFile(pf.abPath, pf.CopyabPath, pf);
        //删除备份文件夹
        ClearTemp(pf);
    }

 protected static Platform GetPlatform()
    {
        Platform pf = new Platform();
        pf.abFilesDic = new Dictionary<string, string>();
        pf.CopyabFilesDic = new Dictionary<string, string>();
        pf.NeedDownFiles = new List<string>();
        pf.ABsFilePath = Application.dataPath + "/StreamingAssets/ABs/";
        string tag = "Unkonwn";
#if UNITY_ANDROID
        tag = "Android";
        pf.target = BuildTarget.Android;
#endif

#if UNITY_IPHONE
        tag = "IOS";
        pf.target = BuildTarget.iOS;
#endif

#if UNITY_STANDALONE_WIN
        tag = "Win";
        pf.target = BuildTarget.StandaloneWindows64;
#endif

#if UNITY_WSA
        tag = "WSA";
        pf.target = BuildTarget.WSAPlayer;
#endif
        pf.abPath = Application.dataPath + "/../ABS_" + tag + "/AssetBundles/";
        pf.CopyabPath = Application.dataPath + "/../ABS_" + tag + "/OldAssetBundles/";
        pf.name = "AssetBundles";

        pf.changeFilePath = Application.dataPath + "/../ABS_" + tag + "/" + tag + System.DateTime.Now.ToString("_yyyyMMdd_HHmmss") + "/";
        return pf;
    }

 static void ClearIncrements(Platform pf)
    {
        if (Directory.Exists(pf.changeFilePath))
        {
            Directory.Delete(pf.changeFilePath, true);
        }
    }

 static void ClearTemp(Platform pf)
    {
        if (Directory.Exists(pf.CopyabPath))
        {
            Directory.Delete(pf.CopyabPath, true);
        }
    }

 protected static void CheckPath(string path)
    {
        if (!System.IO.Directory.Exists(path))
        {
            System.IO.Directory.CreateDirectory(path);
        }
    }

  //将当前的asset bundle备份一份，

 public static void CopyDirectory(string srcPath, string destPath)
    {
        try
        {
            DirectoryInfo dir = new DirectoryInfo(srcPath);
            FileSystemInfo[] fileinfo = dir.GetFileSystemInfos();  //获取目录下（不包含子目录）的文件和子目录
            foreach (FileSystemInfo i in fileinfo)
            {
                if (i is DirectoryInfo)     //判断是否文件夹
                {
                    if (!Directory.Exists(destPath + "\\" + i.Name))
                    {
                        Directory.CreateDirectory(destPath + "\\" + i.Name);   //目标目录下不存在此文件夹即创建子文件夹
                    }
                    CopyDirectory(i.FullName, destPath + "\\" + i.Name);    //递归调用复制子文件夹
                }
                else
                {
                    File.Copy(i.FullName, destPath + "\\" + i.Name, true);      //不是文件夹即复制文件，true表示可以覆盖同名文件
                }
            }
        }
        catch (System.Exception e)
        {
            throw;
        }
    }

    static void CreateSizeFile(string path)
    {
        using (FileStream t_file = new FileStream(path + "_FileSize.txt", FileMode.Create, FileAccess.Write))
        {
            using (StreamWriter t_sw = new StreamWriter(t_file))
            {
                DirectoryInfo dir = new DirectoryInfo(path);
                string perStr = dir.FullName;

                System.Text.StringBuilder sb = new System.Text.StringBuilder();
                Ddir(path, sb, perStr);
                t_sw.Write(sb.ToString());
            }
        }
        index = 0;
        using (FileStream t_file = new FileStream(path + "ResList.txt", FileMode.Create, FileAccess.Write))
        {
            using (StreamWriter t_sw = new StreamWriter(t_file))
            {
                DirectoryInfo dir = new DirectoryInfo(path);
                string perStr = dir.FullName;

                System.Text.StringBuilder sb = new System.Text.StringBuilder();
                Ddir2(path, sb, perStr);

                Ddir2End(sb);
                t_sw.Write(sb.ToString());
            }
        }
    }

 //比较最新的asset bundle和备份的assetbundle ,并复制到新的增量文件夹

 static void CopyChangeFile(string path, string copiedPath, Platform pf)
    {
        DirectoryInfo newPath = new DirectoryInfo(path);
        DirectoryInfo oldPath = new DirectoryInfo(copiedPath);
        List<FileInfo> list = new List<FileInfo>();

        GetChangedAbs(path, newPath.FullName, oldPath.FullName, ref list);


        DirectoryInfo changePath = new DirectoryInfo(pf.changeFilePath);

        if (changePath.Exists)
        {
            changePath.Delete();
        }
        changePath.Create();
        foreach (var file in list)
        {
            FileInfo fi = new FileInfo(file.FullName.Replace(newPath.FullName, changePath.FullName));
            if (!Directory.Exists(fi.Directory.FullName))
            {
                fi.Directory.Create();
            }
            File.Copy(file.FullName, fi.FullName);
        }
    }

 static void ClearTemp(Platform pf)
    {
        if (Directory.Exists(pf.CopyabPath))
        {
            Directory.Delete(pf.CopyabPath, true);
        }
    }

 将新增资源拷贝到ABs文件夹中

 /// <summary>
    /// 将新增资源拷贝到ABs文件夹中
    /// </summary>
    //[MenuItem("Build AssetBundle/Taptap/2-Copy AssetBundles To StreamingAssets")]
    public static void CopyFilesToABsFile()
    {
        Platform pf = GetPlatform();
        CheckPath(pf.ABsFilePath);
        DeleteFiles(pf.ABsFilePath);
        CheckPath(pf.ABsFilePath);
        CopyDirectory(pf.abPath, pf.ABsFilePath);
        AssetDatabase.Refresh();
        Debug.Log("CopyFilesToABsFile OK");
    }