Android之android.graphics.drawable.Drawable.Callback回调接口

[java] view plaincopy /*如果你想实现一个扩展子Drawable的动画drawable，那么你可以通过setCallBack(android.graphics.drawable.Drawable.Callback)来把你实现的该接口注册到动画drawable *中。可以实现对动画的调度和执行 */   public static interface Callback {          /**          * 当drawable重画时触发，这个点上drawable将被置为不可用（起码drawable展示部分不可用）          * @param 要求重画的drawable          */          public void invalidateDrawable(Drawable who);            /**          * drawable可以通过该方法来安排动画的下一帧。可以仅仅简单的调用postAtTime(Runnable, Object, long)来实现该方法。参数分别与方法的参数对          *应          * @param who The drawable being scheduled.          * @param what The action to execute.          * @param when The time (in milliseconds) to run          */          public void scheduleDrawable(Drawable who, Runnable what, long when);            /**          *可以用于取消先前通过scheduleDrawable(Drawable who, Runnable what, long when)调度的某一帧。可以通过调用removeCallbacks(Runnable,Object)来实现          * @param who The drawable being unscheduled.          * @param what The action being unscheduled.          */          public void unscheduleDrawable(Drawable who, Runnable what);      }