When i launch the kali shell terminal (i use Terminal Emulator for Android, which is installed by default) and i type the command "xterm" it fail show

xterm: Xt error: Can't open display: %s
xterm: DISPLAY is not set

if i execute echo $DISPLAY nothing is printed
i also try set the variable by lauching: DISPLAY=:0, but after i type xterm same error happen (DISPLAY not set)

I need to launch xterm because a lots of script use xterm -e to open a new terminal (es: to open airbase-ng or dnsspoof etc)

Is there a way to fix this?
Is there a command to open multiple windows on "Terminal Emulator for Android"?
How can i modify the script to open a new shell on kali terminal and be able to run simultanely airbase-ng and dnsspoof?

I have the last Nethunter 2.0.1 for OnePlus One CM 12.1