之前写了一篇关于Unity安卓一键打包，那个是打出apk应用的，后面也说了平台要弄聚合SDK，需要我们这边出母包，也就是AAR。为了省去重复劳动（主要是我工作电脑上用Unity2017.4.7f1版本不管用Gradle打apk还是导出Android Studio工程，都会卡在done这，然后Unity就卡死了），所以专门花了一天时间研究下写了个一键生成AAR包的工程。

       其实没什么难点，核心思想就是导出Android Studio Project，这个可以用Unity自带的API来实现，然后通过IO操作修改一些文件，比如build.gradle和AndroidManifest.xml这2个文件。最后再用批处理生成AAR就行。

       有些比较重要的我都写了注释，所以也就懒得解释了。Unity自带的API导出Android Studio Project工程的地方需要注意下，注意BuildOptions参数和输出文件夹，不然会出错的。其实还有一段是对c#脚本的IO处理，也就是修改外网包和开发包几个变量的代码，因为涉及到项目了，所以也就不放出这些相关接口。

public class OneKeyBuildAAR
{private static string androidProjectName = "test2018";private static Dictionary<string, string> andoridFiles;private static List<string> androidNeedUpdateFile = new List<string>() { "build.gradle", "AndroidManifest.xml" };[MenuItem("一键打包/一键生成AAR")]public static void OneKeyExportAAR(){BuildAndroidStudioProject(false);BuildAAR();}[MenuItem("一键打包/1. 导出Android Studio工程")]public static void ExportAndroidStudioProject(){BuildAndroidStudioProject(true);}[MenuItem("一键打包/2. 生成AAR")]public static void ExportAAR(){BuildAAR();}/// <summary>/// 导出Android Studio工程/// </summary>/// <param name="bIsOpenDirectory">是否自动打开文件夹</param>/// <returns></returns>private static bool BuildAndroidStudioProject(bool bIsOpenDirectory){if (EditorUserBuildSettings.activeBuildTarget != BuildTarget.Android){UnityEditor.EditorUtility.DisplayDialog("打AAR包失败", "请切换到Android平台", "确认");return false;}// 设置成Gradle打包EditorUserBuildSettings.androidBuildType = AndroidBuildType.Release;EditorUserBuildSettings.buildScriptsOnly = false;EditorUserBuildSettings.androidBuildSystem = AndroidBuildSystem.Gradle;EditorUserBuildSettings.exportAsGoogleAndroidProject = true;// 设置productName，因为如果设置为中文名的话，导出的工程就是中文名，后面生成AAR会失败var productName = PlayerSettings.productName;PlayerSettings.productName = androidProjectName;var scenes = AutoBuilder.GetScenePaths();var publisPath = GetPublishPath();if (Directory.Exists(publisPath))Directory.Delete(publisPath, true);// BuildOptions必须设置为AcceptExternalModificationsToPlayer，不然的话会打出不带后缀的文件，不是导出AndroidStudio工程var message = BuildPipeline.BuildPlayer(scenes, publisPath, BuildTarget.Android, BuildOptions.AcceptExternalModificationsToPlayer);PlayerSettings.productName = productName;if (!string.IsNullOrEmpty(message)){UnityEngine.Debug.LogError("build message: " + message);return false;}elseUnityEngine.Debug.Log("<color=\"blue\">Build Android Studio Project: Succeed</color>");if(bIsOpenDirectory)OpenDirectory(publisPath);return true;}/// <summary>/// 生成AAR/// </summary>private static void BuildAAR(){var projectPath = GetPublishPath() + "/" + androidProjectName;if(!Directory.Exists(projectPath)){UnityEngine.Debug.LogError("Android Studio Project was not found: " + projectPath);return;}if(SetupAndroidStudioProject(projectPath)){int lastIndex = Application.dataPath.LastIndexOf("/");string path = Application.dataPath.Substring(0, lastIndex) + "/BulidAAR";File.Copy(path + "/BuildAAR.bat", projectPath + "/BuildAAR.bat", true);Process proc = System.Diagnostics.Process.Start(projectPath + "/BuildAAR.bat");proc.WaitForExit();}}/// <summary>/// 设置Android Studio工程一些参数/// </summary>/// <param name="projectPath"></param>private static bool SetupAndroidStudioProject(string projectPath){if (!Directory.Exists(projectPath)){UnityEngine.Debug.LogError("Android Studio Project was not found: " + projectPath);return false;}if (null == andoridFiles)andoridFiles = new Dictionary<string, string>();elseandoridFiles.Clear();FindFiles(andoridFiles, projectPath, androidNeedUpdateFile);var count = 0;foreach (var temp in andoridFiles){//UnityEngine.Debug.Log("key: " + temp.Key + "---value: " + temp.Value);if (temp.Key.Equals("build.gradle")){if(UpdateBuildGradle(temp.Value)){++count;UnityEngine.Debug.Log("修改了" + temp.Key + "文件");}}if(temp.Key.Equals("AndroidManifest.xml")){if (UpdateAndroidManifest(temp.Value)){++count;UnityEngine.Debug.Log("修改了" + temp.Key + "文件");}}}if(androidNeedUpdateFile.Count != count){UnityEngine.Debug.Log("有文件漏改了");return false;}return true;}/// <summary>/// 修改build.gradle/// </summary>/// <param name="filePath"></param>/// <returns></returns>private static bool UpdateBuildGradle(string filePath){if (!File.Exists(filePath))return false;try{StreamReader reader = new StreamReader(filePath);var content = reader.ReadToEnd().Trim();reader.Close();if(content.Contains("com.android.application"))                              // 将Application改成Librarycontent = content.Replace("com.android.application", "com.android.library");if(!content.Contains("//applicationId") && content.Contains("applicationId"))//去掉applicationIdcontent = content.Replace("applicationId", "//applicationId");StreamWriter writer = new StreamWriter(new FileStream(filePath, FileMode.Create));writer.WriteLine(content);writer.Flush();writer.Close();}catch (Exception e){UnityEngine.Debug.Log("UpdateAndroidManifest - Failed: " + e.Message);return false;}return true;}/// <summary>/// 修改AndroidManifest.xml/// </summary>/// <param name="filePath"></param>/// <returns></returns>private static bool UpdateAndroidManifest(string filePath){if (!File.Exists(filePath))return false;try{StreamReader reader = new StreamReader(filePath);var content = reader.ReadToEnd().Trim();reader.Close();//去掉 intent-filter 标签var firstStr = "<intent-filter>";var secondStr = "</intent-filter>";var firstIndex = content.IndexOf(firstStr);var lastIndex = content.LastIndexOf(secondStr);var count = lastIndex - firstIndex + secondStr.Length;if(firstIndex > 0 && count > 0)content = content.Remove(firstIndex, count);StreamWriter writer = new StreamWriter(new FileStream(filePath, FileMode.Create));writer.WriteLine(content);writer.Flush();writer.Close();}catch(Exception e){UnityEngine.Debug.Log("UpdateAndroidManifest - Failed: " + e.Message);return false;}return true;}private static void FindFiles(Dictionary<string, string> findFiles, string path, List<string> needFindFiles){if (!Directory.Exists(path))return;DirectoryInfo dirInfo = new DirectoryInfo(path);var files = dirInfo.GetFileSystemInfos();for (int i = 0; i < files.Length; ++i){var fileName = files[i].Name;if (fileName.Contains("."))//文件{var fileFullName = files[i].FullName;for (int j = 0; j < needFindFiles.Count; ++j){if(fileName.Equals(needFindFiles[j])){if (findFiles.ContainsKey(fileName))findFiles[fileName] = fileFullName;elsefindFiles.Add(fileName, fileFullName);} }}else//文件夹FindFiles(findFiles, files[i].FullName, needFindFiles);}}/// <summary>/// Android Studio工程输出路径/// 使用这个路径（Application.dataPath + "/.."），会失败，说是(Build Path same as Project Path)/// </summary>/// <returns></returns>public static string GetPublishPath(){int lastIndex = Application.dataPath.LastIndexOf("/");string publishPath = Application.dataPath.Substring(0, lastIndex) + "/output";//UnityEngine.Debug.LogError("publishPath: " + publishPath);return publishPath;}#region 打开文件夹public static void OpenDirectory(string path){// 新开线程防止锁死Thread newThread = new Thread(new ParameterizedThreadStart(CmdOpenDirectory));newThread.Start(path);}private static void CmdOpenDirectory(object obj){Process p = new Process();p.StartInfo.FileName = "cmd.exe";p.StartInfo.Arguments = "/c start " + obj.ToString();//UnityEngine.Debug.Log(p.StartInfo.Arguments);p.StartInfo.UseShellExecute = false;p.StartInfo.RedirectStandardInput = true;p.StartInfo.RedirectStandardOutput = true;p.StartInfo.RedirectStandardError = true;p.StartInfo.CreateNoWindow = true;p.Start();p.WaitForExit();p.Close();}#endregion
}

       代码中有用到一个批处理文件（BuildAAR.bat），代码也放出来，也很简单，就2句代码。

cd /d %~dp0start gradle clean assembleRelease

       参考了这篇文章unity打aar包工具，大佬是用Android Studio工程生成AAR的，而且还是用java写的，java窗口怎么生成还要用什么IDE的完全不清楚（没学过），只好用c#写，本来还打算用批处理来处理IO操作的，说尽量简单点，那就没办法了。

注意：

       用了一段时间没什么大问题，但因为.gradle的缓存文件在C盘，导致C盘快炸了，只剩下5个g的内存。所以只好删除缓存文件，切换到其他盘区。修改到F盘后，发现用AndroidStudio可以编译出AAR，用批处理打AAR失败，一直在报这个错误Release resolve files of classpath。网上搜了半天都没找到解决的方法，看到一张图用的是Use local gradle distribution，在想是不是这个问题，测试下，发现没问题，标记下，省的以后花很多时间来重复这个问题。