2、Flutter 填坑记录篇

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 2s

Finished 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