完善了功能

lib_face/src/main/java/com/sw/plate/utils/ScanGunKeyEventHelper.java

@@ -155,11 +155,10 @@ public class ScanGunKeyEventHelper {
      * @return
      */
     public boolean isScanGunEvent(KeyEvent event) {
+        if (event == null || event.getDevice() == null) return false;
         L.e("event===" + event.getDevice().getName() +
                 "===Char===" + event.getCharacters() +
                 "===Action===" + event.getAction());
         return event.getDevice().getName().equals(mDeviceName);
     }
-
-
 }