Android studio2.3.1导入从github上下载的demo报如下错误：
Minimum supported Gradle version is 3.3. Current version is 3.2.
Error:(9, 0) Please fix the project's Gradle settings.
Fix Gradle wrapper and re-import project
Gradle settings
Gradle sync failed: Minimum supported Gradle version is 3.3. Current version is 2.2.1. If using the gradle wrapper, try editing the distributionUrl in D:\AndroidStudioProjects\MqttDemo\newmqtt\AndroidMQTT-master\gradle\wrapper\gradle-wrapper.properties to gradle-3.3-all.zip
Consult IDE log for more details (Help | Show Log)
解决方法如下：
（1）先百度下载Gradle 3.3的压缩包，解压缩后放到Android的安装目录下，
例如我的是放到了D:\Android\AndroidStudio\gradle的下面。
（2）打开出问题的项目，点击File-->Settings-->Build.Execution.Deployment.Gradle
下的Project-level settings
1.Use default gradle wrapper(recommended)
2.Use local gradle distribution
选择2，下面的Gradle home就可以编辑
选择刚刚下载的Gradle3.3的安装目录例如我的D:/Android/AndroidStudio/gradle/gradle-3.3
3.然后点击Try again，编译就可通过。