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  • 设计模式:view.post() 责任链模式

    今天刚看了一篇文章讲责任链模式的文章。http://www.cnblogs.com/chenssy/p/3332193.html

    开发的时候,碰到view.post()方法,读源码的过程中感觉很像责任链模式。

    /**
         * <p>Causes the Runnable to be added to the message queue.
         * The runnable will be run on the user interface thread.</p>
         *
         * @param action The Runnable that will be executed.
         *
         * @return Returns true if the Runnable was successfully placed in to the
         *         message queue.  Returns false on failure, usually because the
         *         looper processing the message queue is exiting.
         *
         * @see #postDelayed
         * @see #removeCallbacks
         */
        public boolean post(Runnable action) {
            final AttachInfo attachInfo = mAttachInfo;
            if (attachInfo != null) {
                return attachInfo.mHandler.post(action);
            }
            // Assume that post will succeed later
            ViewRootImpl.getRunQueue().post(action);
            return true;
        }

    如果attachInfo不为空,则自己处理,为空则交给ViewRootImpl处理。一时想到了,记一下,欢迎拍砖。

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  • 原文地址:https://www.cnblogs.com/ameryzhu/p/6555636.html
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