Install Oracle JAVA 8

Source

First of all you need to add webupd8team Java PPA repository in your system. After that install, Oracle Java 8 using following a set of commands.
$ sudo add-apt-repository ppa:webupd8team/java
$ sudo apt-get update
$ sudo apt-get install oracle-java8-installer

Verify Installed Java Version

After successfully installing oracle Java using above step verify installed version using the following command.
rahul@tecadmin:~$ java -version 

java version "1.8.0_121"
Java(TM) SE Runtime Environment (build 1.8.0_121-b13)
Java HotSpot(TM) 64-Bit Server VM (build 25.121-b13, mixed mode, sharing)

Configuring Java Environment

Also, install java configuration package. It seems like below package is already installed with latest operating systems during installation of JAVA packages. But you can still make sure by running below command.
$ sudo apt-get install oracle-java8-set-default
Now edit /etc/environment configuration file and add following entries to set JAVA_HOME and JRE_HOME environment variables.
JAVA_HOME=/usr/lib/jvm/java-8-oracle
JRE_HOME=/usr/lib/jvm/java-8-oracle/jre 
 
 
https://help.ubuntu.com/community/AndroidSDK

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