2019-03-20 flutter学习记录

3月一次偶然也是必然的机会，促使自己有想法学习flutter，下面就遇到的一些问题进行记录。

一、安装flutter遇到的问题：

1、Mac终端输入命令总是出现command not found！

解决：https://blog.csdn.net/fuyundage/article/details/79516286

2、Mac安装Python3报错：
Permission denied @ dir_s_mkdir - /usr/local/Frameworks

Warning: python 3.7.2_1 is already installed, it's just not linked.
You can use brew link python to link this version.

解决：https://www.jianshu.com/p/965fd0be3f0c

二、运行flutter项目报错：

Launching lib/main.dart on Android SDK built for x86 in debug mode...
Initializing gradle...
Resolving dependencies...

• Error running Gradle:
  ProcessException: Process "/Users/rabbit/develop/android/flutter_app/android/gradlew" exited abnormally:
  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 '/Users/rabbit/develop/android/flutter_app/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 0s
Command: /Users/rabbit/develop/android/flutter_app/android/gradlew app:properties

Finished with error: Please review your Gradle project setup in the android/ folder.

参考解决方案：

1. 修改源
2. 翻墙--下载了PeerVPN
3. 修改项目的/android/app/build.gradle文件中的sdk版本号为28 (运行成功后，我改回27正常运行，估计更多的是墙原因吧，版本号不碍事)

三、Android Studio找不到iPhone真机

iPhone模拟器：
终端输入：flutter doctor命令
可以发现，设备选择中能找到iPhone模拟器
真机：发现没有可选的真机可用
参考解决：https://www.jianshu.com/p/69e1efc2fc55