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So we have Android device (with USB host support) and Arduino Uno board connected using USB OTG cable
here we have potentiometer and pushbutton attached
tap on USB device in the list
set pin 8 in 'digital input' mode
set pin 5 in 'analog input' mode
push button and see pin state is changing (0/1)
change analog input value using potentiometer and see pin text and color is changing
now select "Oscilloscope *" menu item
tap "Start" button to start monitoring pins in input modes
push button and change analog input value and see changes (low level is displayed as 0v and high as 5v)
tap "Stop" button to stop monitoring
use pinch-zoom to scale or move the graphics
configure lines colors as you wish
you can see min, max, avg, last value for every pin