java.lang.NullPointerException: Attempt to invoke interface method 'java.lang.String java.lang.CharSequence.toString()' on a null object reference at tw.com.daxia.virtualsoftkeys.service.ServiceFloating.onAccessibilityEvent(ServiceFloating.java:130) at android.accessibilityservice.AccessibilityService$2.onAccessibilityEvent(AccessibilityService.java:1450) at android.accessibilityservice.AccessibilityService$IAccessibilityServiceClientWrapper.executeMessage(AccessibilityService.java:1586)