Detecting Common Gestures. A "touch gesture" occurs when a user places one or more fingers on the touch screen, and your application interprets that pattern of touches as a particular gesture.
There are correspondingly two phases to gesture detection: Gathering data about touch events. Developing an Accessibility Service. Accessibility services are a feature of the Android framework designed to provide alternative navigation feedback to the user on behalf of applications installed on Android devices. An accessibility service can communicate to the user on the application's behalf, such as converting text to speech, or haptic feedback when a user is hovering on an important area of the screen. This lesson covers how to create an accessibility service, process information received from the application, and report that information back to the user.
Create Your Accessibility Service. R.attr. Design. Key Character Map Files.