title: Android Global touch event
body: <p>I'm making a background app A in android, and want to catch the touch event on the screen.
  Because the foreground app B (currently running one) is not my app,
  I can't use the intent for inter-app communication.</p>
  
  <p>Can I read the touch sensing information like other GPS or Accelerometer sensors, using public API, hooking(?), even in a low-level from the capacitive touch screen, or in any way? (given the user allowed any permission but rooting)</p>