How Android memory leaks can occur

1. The callback interface is registered, but the callback interface is not unregistered, resulting in a memory leak.

Example:

1. Register

   // Register an event callback to handle the result of the send verification code operation
    SMSSDK.registerEventHandler(new EventHandler() {
        public void afterEvent(int event, int result, Object data) {
            if (result == SMSSDK.RESULT_COMPLETE) {
               // TODO processing successfully gets the result of the verification code
               // Please note that the request to send the verification code is only completed at this time, and the verification code SMS will take a few seconds to arrive
            } else{
                // TODO handle wrong result
            }
        
        }
    });

2. Log out

   protected void onDestroy() {
        super.onDestroy ();
        //When the callback is used up, log out, otherwise there may be a memory leak
        SMSSDK.unregisterAllEventHandler();
    };