二、Flutter 填坑記錄篇

 一、前言

以前寫了一篇文章關於 flutter 初體驗的一篇，http://www.javashuo.com/article/p-zogfhxcq-kq.html，當時一頓騷操做，而後程序就跑起來了。

隔了好一段時間，換了個電腦，從新裝了個AndroidStudio，繼續搭建 Flutter ，而後哐哧哐哧用了一會就把須要配置弄好了，而後用 AS 建立了個項目，好傢伙，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.

二、問題分析

先看最後一條信息：

finished with error: please review your gradle project setup in the android/ folder.

說，讓我檢查 gradle，而後各類找，發現沒錯啊。

仍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_  ......

好傢伙，這又是個什麼鬼.

NDK缺乏一個「platforms」目錄。若是您正在使用NDK，請驗證NDK。將dir設置爲有效的NDK目錄。
目前它被設置爲D: AndroidSDK\ndk-bundle。
若是不使用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。

下載連接：https://developer.android.google.cn/ndk/downloads/

 下載，解壓zip文件 獲得一個 android-ndk-rXXb 的文件夾，直接解壓，而後把該文件夾下的全部文件都移動到你的，sdk，ndk-bundle 文件夾下。

再配置個環境變量，重啓 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。

 

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