I use below code fine in my activity.
dispatchKeyEvent(new KeyEvent (KeyEvent.ACTION_UP, KeyEvent.KEYCODE_BACK));
How i can use above line code in Service
I think dispatchKeyEvent method exist in Activity class and not Exist in Service class.
Correct. Services do not have a UI and therefore do not have key events to be dispatched.
So are any other way or how fix it.
Do not attempt to dispatch a key event from a service.
dispatchKeyEvent(), to the extent that anyone uses it, is for simulating key events in an activity's own UI. Your service is welcome to tell your activity to dispatch a key event. You might use an event bus implementation (e.g., greenrobot's EventBus) for this.