title: How to measure touch pressure in Android in all activity?
body: <p>I know that it is easy to measure the touch pressure by using the function getPressure() provided by android API within an application activity.</p>
  
  <p>However, I would like to measure all the motionevents (not only within the application activiy, but also outside the application activity).</p>
  
  <p>How can I achieve this?</p>