i8.sh

#!/data/data/com.termux/files/usr/bin/bash

#Setup
shopt -s expand_aliases
alias ee='echo -e'

#Greetings
echo
ee "\e[93mThis script will install Java(jdk8) in Termux."
echo



install_jdk(){
#Actual installation
ee "\e[32m[*] \e[34mDownloading JDK-8 for $(dpkg --print-architecture)...\e[0m"
pkg install wget tar -y
wget https://github.com/Hax4us/java/releases/download/v8/jdk8_aarch64.tar.gz

wgetreturn=$?
    if [[ $wgetreturn -eq 0 ]]
    then
    ee "\e[32m[*] \e[34mMoving JDK to $PREFIX/share..."
    mv jdk8_aarch64.tar.gz "$PREFIX"/share

    ee "\e[32m[*] \e[34mExtracting JDK..."
    cd "$PREFIX"/share || exit
    tar -xvf jdk8_aarch64.tar.gz

    ee "\e[32m[*] \e[34mSeting-up %JAVA_HOME%..."
    export JAVA_HOME=$PREFIX/share/jdk8
    echo "export JAVA_HOME=""$PREFI/X""/share/jdk8" >> "$HOME"/.profile
    PATH=$PREFIX/share/jdk8/bin:$PATH
    echo "PATH=""$PREFIX""/share/jdk8/bin:""$PATH"" " >> "$HOME"/.profile
    
    ee "\e[32m[*] \e[34mCleaning up temporary files..."
    rm -rf "$PREFIX"/share/jdk8_aarch64.tar.gz

    echo
    ee "\e[32mJava was successfully installed!\e[39m"
    ee "Enjoy your new, tasty Java\e[0m"
    ee "\e[32m Note : You must restart termux by exiting or start a new instance of termux, in order to load java command \e[0m"
    echo
    echo                                                
    else
        ee "\e[31mwget exited with an error code : $wgetreturn"
        case $wgetreturn in
        1)
            ee "\e[31mError : Generic code error\e[0m"
            ;;
        2)
            ee "\e[31mError : Parse error-for instance, when parsing command-line options, the .wgetrc or .netrc...\e[0m]"
            ;;
        3)
            ee "\e[31mError : File I/O error.\e[0m"
            ;;
        4)
            ee "\e[31mError : Network failure.\e[0m"
            ;;
        5)
            ee "\e[31mError : SSL verification failure.\e[0m"
            ;;
        6)
            ee "\e[31mError : Username/password authentication failure\e[0m"
            ;;
        7)
            ee "\e[31mError : Protocol errors.\e[0m"
            ;;
        8)
            ee "\e[31mError : Server issued an error response.\e[0m"                                        
            ;;
        esac

        rm -rf jdk8_aarch64.tar.gz
        echo
        exit
    fi
    
}



#Checking for existing Java installation
if [ -e "$PREFIX"/bin/java ] || [ -e "$PREFIX"/share/openjdk-11.0.1/bin/java ] || [ -e "$PREFIX"/share/jdk8/bin/java ]
then
   ee "\e[32mJava is already installed"
   ee "\e[32mInstalling multiple versions of jdk may break your java-environment variables....\e[0m"
   echo
   read -p "continue only if you know how to manage them. Continue? (y/n): " choice
    if [[ $choice == y || $choice == Y ]]; then 
     install_jdk
    else
      echo
      ee "Aborted by user"
      exit
    fi
else
  install_jdk
fi