1、前言
之前写了一篇文章关于 flutter 初体验的一篇，https://www.cnblogs.com/niceyoo/p/9240359.html，当时一顿骚操作，然后程序就跑起来了。
隔了好一段时间，换了个电脑，重新装了个AndroidStudio，继续搭建 Flutter ，然后哐哧哐哧用了一会就把需要配置弄好了，然后用 AS 创建了个项目，好家伙，直接报错。
Launching lib\main.dart on ONEPLUS A5010 in debug mode... Initializing gradle... Resolving dependencies... * Error running Gradle: Exit code 1 from: F:\android_studio_workspace\flutter_app2\flutter_app2\android\gradlew.bat app:properties: NDK is missing a "platforms" directory. If you are using NDK, verify the ndk.dir is set to a valid NDK directory. It is currently set to E:\AndroidSDK\ndk-bundle. If you are not using NDK, unset the NDK variable from ANDROID_NDK_HOME or local.properties to remove this warning.Project evaluation failed including an error in afterEvaluate {}. Run with --stacktrace for details of the afterEvaluate {} error.FAILURE: Build failed with an exception.* Where: Build file 'F:\android_studio_workspace\flutter_app2\flutter_app2\android\app\build.gradle' line: 25* What went wrong: A problem occurred evaluating project ':app'. > Could not resolve all files for configuration 'classpath'. > Could not find lint-gradle-api.jar (com.android.tools.lint:lint-gradle-api:26.1.2). Searched in the following locations: https://jcenter.bintray.com/com/android/tools/lint/lint-gradle-api/26.1.2/lint-gradle-api-26.1.2.jar* Try: Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.* Get more help at https://help.gradle.org BUILD FAILED in 2sFinished with error: Please review your Gradle project setup in the android/ folder.
2、问题分析
先看最后一条信息：
finished with error: please review your gradle project setup in the android/ folder. 说，让我检查 gradle，然后各种找，发现没错啊。
还是从第一条错误开始看吧：
NDK is missing a "platforms" directory. If you are using NDK, verify the ndk_ ......
好家伙，这又是个什么鬼.
NDK缺少一个“platforms”目录。如果您正在使用NDK，请验证NDK。将dir设置为有效的NDK目录。
目前它被设置为D: AndroidSDK\ndk-bundle。
如果不使用NDK，请从ANDROID_NDK_HOME或local中卸载NDK变量。属性删除此警告。
2.1 解决第一个问题
既然说少了就装个吧。
下载链接：https://developer.android.google.cn/ndk/downloads/
下载，解压zip文件 得到一个 android-ndk-rXXb 的文件夹，直接解压，然后把该文件夹下的所有文件都移动到你的，sdk，ndk-bundle 文件夹下。
再配置个环境变量，重启 AS 解决问题。
2.2 解决第二个问题
Build file 'F:\android_studio_workspace\flutter_app2\flutter_app2\android\app\build.gradle' line: 25
找到 flutter SDK 路径下的 \flutter\packages\flutter_tools\gradle\flutter.gradle 文件。
把 gradle 版本改低一点。
博客地址：https://www.cnblogs.com/niceyoo
