安装gomobile

Note: You need to have Go 1.5 or above to install mobile tools. (Or at least Go 1.7.4 if using macOS Sierra)
Go Mobile introduces a new tool, gomobile, to help you with the build and the binding process.
On OS X, you will need to have Xcode Command Line Tools installed.)

cd $GOPATH

go get golang.org/x/mobile/cmd/gomobile

(在$GOBIN/里面就会出现可执行文件gomobile）

gomobile -h

会显示：

Gomobile is a tool for building and running mobile apps written in Go.

To install:

 $ go get golang.org/x/mobile/cmd/gomobile
 $ gomobile init

At least Go 1.10 is required.
For detailed instructions, see https://golang.org/wiki/Mobile.

Usage:

 gomobile command [arguments]

Commands:

 bind        build a library for Android and iOS
 build       compile android APK and iOS app
 clean       remove object files and cached gomobile files
 init        build OpenAL for Android
 install     compile android APK and install on device
 version     print version

Use 'gomobile help [command]' for more information about that command. 

项目地址：https://github.com/golang/go/wiki/Mobile

https://godoc.org/golang.org/x/mobile/cmd/gomobile