Use the Gradle Wrapper for your Android projects
http://kevinpelgrims.com/blog/2015/05/25/use-the-gradle-wrapper-for-your-android-projects/
Gradle version 1.8 is required. Current version is 1.6
http://stackoverflow.com/questions/19460349/gradle-version-1-8-is-required-current-version-is-1-6
How to properly write a gradle-wrapper.properties file?
http://stackoverflow.com/questions/24184579/how-to-properly-write-a-gradle-wrapper-properties-file
“Gradle Version 2.10 is required.” Error
http://stackoverflow.com/questions/34814368/gradle-version-2-10-is-required-error
原文：http://www.cnblogs.com/qike/p/5410688.html