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android-build-server-guide

Guide to building a proper android build server, for continous integration using Gitlab CI.

#INSTALLING JDK Depending on compileSdkVersion you can compile java classes using jdk 7 or 8. Thought the procedure for installing jdk 7 and 8 is same, except you download different files (i recommend installing jdk7)

The manual way

  • Download JDK 7 from oracle website

    The file names follows below format

      jdk-7u<version>-linux-x64.tar.gz

    Where is the update number currently the latest is 79.

    So for 32bit version 79 linux OS it would be jdk-7u79-linux-x86.tar.gz and 64 bit it would be jdk-7u79-linux-x64.tar.gz

    So download the jdk depending on your linux os being 32bit or 64bit and the version of your choice.

  • Unzip the downloaded tar.gz file

      $ tar zxvf jdk-7u<version>-linux-x64.tar.gz

    This command untar(uncompresses) the compressed folder and its contents

    I would recommend unzipping it to /usr/local/java

  • For gradle you need to add JAVA_HOME and JRE_HOME environment variables

    Do sudo gedit /etc/profile or if you don't have a GUI but are running a terminal only version of linux OS, then do sudo nano /etc/profile I'm assuming you know how to use the nano editor if not google!

    You need to add these lines at the bottom of the file

      JAVA_HOME=/usr/local/java/jdk1.7.0_79
  JRE_HOME=$JAVA_HOME/jre
  PATH=$PATH:$JAVA_HOME/bin:$JRE_HOME/bin
  export JAVA_HOME
  export JRE_HOME
  export PATH

    press ctrl+o to write out, press ctrl+x to exit the nano editor.

    reboot the OS.

    (Taken from http://askubuntu.com/a/55960)

  • Now run

    sudo update-alternatives --install "/usr/bin/java" "java" "/usr/local/java/jdk1.7.0_79/bin/java" 1
sudo update-alternatives --install "/usr/bin/javac" "javac" "/usr/lib/jvm/jdk1.7.0_79/bin/javac" 1
sudo update-alternatives --install "/usr/bin/javaws" "javaws" "/usr/lib/jvm/jdk1.7.0_79/bin/javaws" 1

    This will assign Oracle JDK a priority of 1, which means that installing other JDKs will replace it as the default. Be sure to use a higher priority if you want Oracle JDK to remain the default.

  • Correct the file ownership and the permissions of the executables:

    sudo chmod a+x /usr/bin/java
sudo chmod a+x /usr/bin/javac
sudo chmod a+x /usr/bin/javaws
sudo chown -R root:root /usr/lib/jvm/jdk1.8.0

    N.B.: Remember - Java JDK has many more executables that you can similarly install as above. java, javac, javaws are probably the most frequently required. This answer lists the other executables available.

  • Run

    sudo update-alternatives --config java

    You will see output similar to the one below - choose the number of jdk1.8.0 - for example 3 in this list (unless you have have never installed Java installed in your computer in which case a sentence saying "There is nothing to configure" will appear):

    $ sudo update-alternatives --config java
There are 3 choices for the alternative java (providing /usr/bin/java).

  Selection    Path                                            Priority   Status
------------------------------------------------------------
  0            /usr/lib/jvm/java-7-openjdk-amd64/jre/bin/java   1071      auto mode
  1            /usr/lib/jvm/java-7-openjdk-amd64/jre/bin/java   1071      manual mode
* 2            /usr/local/java/jdk1.7.0_79/bin/java             1         manual mode
  3            /usr/lib/jvm/jdk1.8.0/bin/java                   1         manual mode

Press enter to keep the current choice[*], or type selection number: 3
update-alternatives: using /usr/lib/jvm/jdk1.8.0/bin/java to provide /usr/bin/java (java) in manual mode

    Repeat the above for:

    sudo update-alternatives --config javac
sudo update-alternatives --config javaws

#INSTALLING GRADLE

  • Download either the gradle binary-only/all distribution, dont download the gradle source code distribution as it would require you to build the source.

  • Extract the zip file and add the environment variable GRADLE_HOME=your gradle installation home folder, in my case i unzipped it to /usr/local/gradle/grade-2.10

  • Next add the path GRADLE_HOME/bin to the environment variable PATH by editing the /etc/profile file.

      sudo  nano /etc/profile

    Add the the below lines similarly like adding the java env variables to profile.

      GRADLE_HOME=/usr/local/gradle/gradle-2.10

    Edit the below line with PATh to look like this

      PATH=$PATH:$JAVA_HOME/bin:$JRE_HOME/bin:$GRADLE_HOME/bin

    Then press ctrl+o to write out (save) ctrl+x to exit nano editor.

Done you have successfully installed gradle.