code: protected Method findMethod(Object obj,int functionId)
  	{
  		Method method=null;
  		if(callTarget!=null)
  		{
  			Method[] methods=callTarget.getClass().getDeclaredMethods();
  			for(Method m:methods)
  			{
  				CallBackFunction function=m.getAnnotation(CallBackFunction.class);
  				if(function!=null && function.id()==functionId)
  				{
  					method=m;
  					break;
  				}
  			}
  		}
  		return method;
  	}
docs: 根据注解ID匹配
  @param obj
  @param functionId
  @return