1) How to activate touch on Android device:
a. Open Settings on the Android device.
b. Scroll to the very bottom of the menu and select ‘About phone’.
c. Scroll to the very bottom of the menu and select ‘Build number’ repeatedly. After the 7th or 8th click you should see a message telling you that you are a developer.
d. Click back to return to the main Settings menu.
e. There should be a new ‘Developer Options’ option above to ‘About phone’ option. Select ‘Developer Options’.
f. Under the ‘Input’ heading there is a ‘Show touches’ option. Selecting this will show all touch events on the screen including pinch to zoom gestures and so on.
On iOS, you can get a similar effect with Touchpose or Fingertips.