Unity5自动命名Assetbundle并打包

using UnityEngine;
using System.Collections;
using UnityEditor;
using System.IO;  

/// <summary>
/// 把Resource下的资源打包成.unity3d 到StreamingAssets目录下
/// </summary>
public class Builder : Editor
{
    public static string sourcePath = Application.dataPath + "/Resources";
    const string AssetBundlesOutputPath = "Assets/StreamingAssets";  

    [MenuItem("Tools/AssetBundle/Build")]
    public static void BuildAssetBundle()
    {
        ClearAssetBundlesName ();  

        Pack (sourcePath);  

        string outputPath = Path.Combine (AssetBundlesOutputPath,Platform.GetPlatformFolder(EditorUserBuildSettings.activeBuildTarget));
        if (!Directory.Exists (outputPath))
        {
            Directory.CreateDirectory(outputPath);
        }  

        //根据BuildSetting里面所激活的平台进行打包
        BuildPipeline.BuildAssetBundles (outputPath,0,EditorUserBuildSettings.activeBuildTarget);  

        AssetDatabase.Refresh ();  

        Debug.Log ("打包完成");  

    }  

    /// <summary>
    /// 清除之前设置过的AssetBundleName，避免产生不必要的资源也打包
    /// 之前说过，只要设置了AssetBundleName的，都会进行打包，不论在什么目录下
    /// </summary>
    static void ClearAssetBundlesName()
    {
        int length = AssetDatabase.GetAllAssetBundleNames ().Length;
        Debug.Log (length);
        string[] oldAssetBundleNames = new string[length];
        for (int i = 0; i < length; i++)
        {
            oldAssetBundleNames[i] = AssetDatabase.GetAllAssetBundleNames()[i];
        }  

        for (int j = 0; j < oldAssetBundleNames.Length; j++)
        {
            AssetDatabase.RemoveAssetBundleName(oldAssetBundleNames[j],true);
        }
        length = AssetDatabase.GetAllAssetBundleNames ().Length;
        Debug.Log (length);
    }  

    static void Pack(string source)
    {
        DirectoryInfo folder = new DirectoryInfo (source);
        FileSystemInfo[] files = folder.GetFileSystemInfos ();
        int length = files.Length;
        for (int i = 0; i < length; i++) {
            if(files[i] is DirectoryInfo)
            {
                Pack(files[i].FullName);
            }
            else
            {
                if(!files[i].Name.EndsWith(".meta"))
                {
                    file (files[i].FullName);
                }
            }
        }
    }  

    static void file(string source)
    {
        string _source = Replace (source);
        string _assetPath = "Assets" + _source.Substring (Application.dataPath.Length);
        string _assetPath2 = _source.Substring (Application.dataPath.Length + 1);
        //Debug.Log (_assetPath);  

        //在代码中给资源设置AssetBundleName
        AssetImporter assetImporter = AssetImporter.GetAtPath (_assetPath);
        string assetName = _assetPath2.Substring (_assetPath2.IndexOf("/") + 1);
        assetName = assetName.Replace(Path.GetExtension(assetName),".unity3d");
        //Debug.Log (assetName);
        assetImporter.assetBundleName = assetName;
    }  

    static string Replace(string s)
    {
        return s.Replace("\\","/");
    }
}  

public class Platform
{
    public static string GetPlatformFolder(BuildTarget target)
    {
        switch (target)
        {
        case BuildTarget.Android:
            return "Android";
        case BuildTarget.iOS:
            return "IOS";
        case BuildTarget.WebPlayer:
            return "WebPlayer";
        case BuildTarget.StandaloneWindows:
        case BuildTarget.StandaloneWindows64:
            return "Windows";
        case BuildTarget.StandaloneOSXIntel:
        case BuildTarget.StandaloneOSXIntel64:
        case BuildTarget.StandaloneOSXUniversal:
            return "OSX";
        default:
            return null;
        }
    }
}