android: install sdkman and install gradle 3.3

$ curl -s https://get.sdkman.io | bash

Thanks for using...                                                              
                                                                                 
                                                                                 
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   SS:::::::::::::::SD::::::::::::DDD    K:::::::K    K:::::K                  
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  S:::::::::::::::SS D::::::::::::DDD    K:::::::K    K:::::K                  
   SSSSSSSSSSSSSSS   DDDDDDDDDDDDD       KKKKKKKKK    KKKKKKK                  
                                                                               
                                                                               
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                    mm:::::::m  m:::::::mm   a::::::::::::a n:::nn::::::::nn   
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                   mmmmmm   mmmmmm   mmmmmm  aaaaaaaaaa  aaaa nnnnnn    nnnnnn 
                                                                                                             
                                                                                                             
                                                 Now attempting installation...
                                                                               
Looking for a previous installation of SDKMAN...
SDKMAN found.

======================================================================================================
 You already have SDKMAN installed.
 SDKMAN was found at:

    /Users/tmac/.sdkman

 Please consider running the following if you need to upgrade.

    $ sdk selfupdate force

======================================================================================================


$source ~/.bash_profile
$sdk install gradle 3.3
$Gradle --version

------------------------------------------------------------
Gradle 3.3
------------------------------------------------------------

Build time:   2017-01-03 15:31:04 UTC
Revision:     075893a3d0798c0c1f322899b41ceca82e4e134b

Groovy:       2.4.7
Ant:          Apache Ant(TM) version 1.9.6 compiled on June 29 2015
JVM:          1.8.0_102 (Oracle Corporation 25.102-b14)
OS:           Mac OS X 10.12.3 x86_64