title: How do I detect touch input on the Android when application is running in the background
body: <p>I want to detect if a particular gesture was made in some other screen <strong>(Not when the app's UI is open)</strong>.</p>
  
  <p>I have seen it in some phones, you make a <strong>'C'</strong> kind of gesture and the camera will open. Is there something like this in Android Studio?</p>