Orange Pi Zero 2 - Configure JAVA Environment Variables; Install JDK; Build Android Compilation Environment

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THE OFFICIAL ORANGE PI USER'S GUIDE
2) After downloading the android source code, first check whether the MD5
checksum is correct, if not, please download the source code again
test@test:~$ md5sum -c android.tar.gz.md5sum
android.tar.gz: confirm
test@test:~$ md5sum -c longan.tar.gz.md5sum
longan.tar.gz: confirm
3) Then unzip the android source code
a. android: store android-related source code
b. longan: store the source code of the linux kernel and u-boot (not including the
source code of boot0), and other configuration files
test@test:~$ tar -zxf android.tar.gz
test@test:~$ tar -zxf longan.tar.gz
test@test:~$ ls
android longan
Build android compilation environment
1) Install JDK
test@test:~$ sudo add-apt-repository ppa:openjdk-r/ppa
test@test:~$ sudo apt-get update
test@test:~$ sudo apt-get install openjdk-8-jdk
2) Configure JAVA environment variables
a. First determine the installation path of java, generally
test@test:~$ ls /usr/lib/jvm/java-8-openjdk-amd64
ASSEMBLY_EXCEPTION bin docs include THIRD_PARTY_README