1、前言
之前寫了一篇文章關於 flutter 初體驗的一篇，https://www.cnblogs.com/niceyoo/p/9240359.html，當時一頓騷操作，然后程序就跑起來了。
隔了好一段時間，換了個電腦，重新裝了個AndroidStudio，繼續搭建 Flutter ，然后哐哧哐哧用了一會就把需要配置弄好了，然后用 AS 創建了個項目，好家伙，直接報錯。
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 2s Finished with error: Please review your Gradle project setup in the android/ folder.
2、問題分析
先看最后一條信息：
finished with error: please review your gradle project setup in the android/ folder.
說，讓我檢查 gradle，然后各種找，發現沒錯啊。
還是從第一條錯誤開始看吧：
NDK is missing a "platforms" directory. If you are using NDK, verify the ndk_ ......
好家伙，這又是個什么鬼.
NDK缺少一個“platforms”目錄。如果您正在使用NDK，請驗證NDK。將dir設置為有效的NDK目錄。
目前它被設置為D: AndroidSDK\ndk-bundle。
如果不使用NDK，請從ANDROID_NDK_HOME或local中卸載NDK變量。屬性刪除此警告。
2.1 解決第一個問題
既然說少了就裝個吧。
下載鏈接：https://developer.android.google.cn/ndk/downloads/
下載，解壓zip文件 得到一個 android-ndk-rXXb 的文件夾，直接解壓，然后把該文件夾下的所有文件都移動到你的，sdk，ndk-bundle 文件夾下。
再配置個環境變量，重啟 AS 解決問題。
2.2 解決第二個問題
Build file 'F:\android_studio_workspace\flutter_app2\flutter_app2\android\app\build.gradle' line: 25
找到 flutter SDK 路徑下的 \flutter\packages\flutter_tools\gradle\flutter.gradle 文件。
把 gradle 版本改低一點。
博客地址：https://www.cnblogs.com/niceyoo