Barrier-free
AccessibilityService. DispatchGesture (gesture, null, null);
Confirm the android: canPerformGestures="true"

A began to run can perform accessibilityService. DispatchGesture (gesture, null, null);
Run after a period of time, however, appear accessibilityService. DispatchGesture (gesture, null, null)==false, false,
Ask everybody to give a suggestion, how to return a responsibility, if the debug for more relevant process information? Thank you,