How to start and stop the timer arbitrarily

We can add a preset timer in REGISTER_ACTIVITY_TIMER_TAB, but this method is not flexible enough to start/stop arbitrarily. Here is another way to add a timer. There are three methods about timers in the Activity class. The following describes how to use them.

/**
 * Register timer
 */
void registerUserTimer(int id, int time);
/**
 * Un-register timer
 */
void unregisterUserTimer(int id);
/**
 * Reset timer
 */
void resetUserTimer(int id, int time);

1. In logic.cc, add a variable to identify whether the timer has been registered.

     /**
      * Whether the timer is registered
      */
     static bool isRegistered = false;
     #define TIMER_HANDLE   2
   

2. Let's add two more buttons. In the click event of the button, we add codes to register and un-registerthe timer respectively.

   
    static bool onButtonClick_ButtonTimerOn(ZKButton *pButton) {
        //Register the timer if not registered
        if (!isRegistered) {
            mActivityPtr->registerUserTimer(TIMER_HANDLE, 500);
            isRegistered = true;
        }
        return false;
    }
   
    static bool onButtonClick_ButtonTimerOff(ZKButton *pButton) {
        //If the timer is already registered, cancel the registration
        if (isRegistered) {
            mActivityPtr->unregisterUserTimer(TIMER_HANDLE);
            isRegistered = false;
        }
        return false;
    }
   

[!Warning] The above-mentioned three functions registerUserTimer, unregisterUserTimer, and resetUserTimer cannot be called in the onUI_Timer function, which will cause deadlock.

Sample code

Refer to the TimerDemo project in Sample Code.
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